Author: "Zhixing Yang" - Searchworks@Jio Institute Digital Library Search Results

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478 results on '"Zhixing Yang"'

201. Performance Measurement on DTTB Systems

Author: Jian Song, Zhixing Yang, and Jun Wang
Subjects: Computer science, Electronic engineering, Performance measurement
Published: 2015
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202. Channel Coding for DTTB System

Author: Zhixing Yang, Jun Wang, and Jian Song
Subjects: Block code, Channel capacity, Computer science, Convolutional code, Automatic repeat request, Code rate, Forward error correction, Error detection and correction, Algorithm, Coding (social sciences)
Abstract: The DTTB system is aimed at delivering digital video programs reliably over the air to user terminals. This chapter introduces the channel coding for DTTB systems with an emphasis on the basic coding concepts and important conclusions for DTTB system design. Error control methods can be divided into two types. One is with feedback, including automatic repeat request (ARQ), information repeat request (IRQ), and hybrid error correction (HEC). Linear block code based on a well-established theory has very clear mathematical structure and has been widely adopted. Under the same code rate and complexity, convolutional codes in general outperform block codes by fully taking the advantage of correlations among codewords. Parallel code is another combination using short codes to form a long code. The chapter also introduces trellis-coded modulation (TCM) technology by combining coding and modulation, with the signal space partition optimized based on the maximum Euclidean distance criterion.
Published: 2015
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203. Second-Generation DTTB Standards

Author: Jian Song, Zhixing Yang, and Jun Wang
Subjects: Computer science
Published: 2015
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204. Digital Mobile Multimedia Broadcasting Systems

Author: Jun Wang, Jian Song, and Zhixing Yang
Subjects: China Multimedia Mobile Broadcasting, business.industry, Computer science, IMT Advanced, Digital Video Broadcasting, Mobile computing, Digital broadcasting, Digital television, Broadcasting, business, Telecommunications, Digital multimedia broadcasting
Abstract: The discussion of mobile multimedia broadcasting technologies and service implementation in this chapter is limited to the broadcasting network based scheme can be received by portable or hand-held devices with a small screen. Similar to DTTB systems, digital mobile multimedia broadcasting systems are designed for high-data-throughput (to support multiple low-data-rate services) transmission through wireless channels (VHF/UHF bands in terrestrial, S- or L-band for satellite networks). The chapter summarizes the features of DVB-H, Advanced Television Systems Committee (ATSC)-M/H, China Multimedia Mobile Broadcasting (CMMB), and the new released DVB Next Generation Broadcasting System to Handheld (NGH) standards with the focus on the technical merits of reliable transmission under wireless, mobile environment and the robust reception using the portable or hand-held devices. ATSC-Mobile/Handheld (ATSC-M/H) is the standard for the DTV mobile transmission developed by the ATSC in 2007. The ATSC-M/H system shares the same RF channel of the traditional ATSC broadcast services.
Published: 2015
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205. First-Generation DTTB Standards

Author: Jun Wang, Jian Song, and Zhixing Yang
Subjects: Computer science, business.industry, Telecommunications, business, First generation
Published: 2015
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206. Design and Implementation of DTV Receiver

Author: Jian Song, Zhixing Yang, and Jun Wang
Subjects: Pilot signal, Computer science, Frequency domain, Equalization (audio), Electronic engineering, Frequency offset, DTV receiver, Impulse response, Synchronization, Communication channel
Abstract: The principles of channel synchronization and channel estimation as well as equalization in the inner receiver for both single- and multicarrier systems are introduced in this chapter, and their applications for the DTMB system is then discussed with some examples. The algorithms for the frequency tracking stage are described and share the requirement of correct timing, which requires that the timing recovery module operate properly within a certain frequency offset range. Unlike the C-OFDM, the time-domain PN sequence instead of the frequency-domain pilot signal is utilized in the TDS-OFDM system, and the receiver can use the PN sequence for channel estimation by acquiring the time-domain impulse response of the channel first and then getting the frequency-domain response through DFT, which is described in detail in the chapter. The channel estimation and equalization methods discussed here are based on the correlation algorithm for the time-domain synchronous PN sequence.
Published: 2015
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207. Basic Concepts of Digital Terrestrial Television Transmission System

Author: Jian Song, Jun Wang, and Zhixing Yang
Subjects: Multimedia, business.industry, Satellite dish, Internet television, IPTV, computer.software_genre, Digital terrestrial television, law.invention, Geography, Analog television, Terrestrial television, law, DTV receiver, Digital television, Telecommunications, business, computer
Abstract: This chapter presents the history and evolution of analog and digital TV over the past century. The key video compression concepts are covered here. Being the most commonly used digital television (DTV) networks worldwide, the Digital Television Terrestrial Broadcasting (DTTB) networks support the largest number of users. The major difference between HDTV and standard-definition TV (SDTV) lies in the image quality, and therefore the bandwidth needed for the transmission is different. From the perspective of visual effects, the image quality of HDTV (over 1000 lines) reaches or comes close to the level of the 35-mm wide-screen film. Moving Image Experts Group (MPEG)-2 is a frame-based compression scheme and is able to reduce interframe redundancy. Currently, many countries are experiencing the migration from analog TV to the DTV. Users can receive DTV services over the air or by cable, satellite dish, Internet protocol television (IPTV), and mobile DTV receiver.
Published: 2015
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208. Digital Terrestrial Television Broadcasting

Author: Jun Wang, Jian Song, and Zhixing Yang
Subjects: Commercial broadcasting, business.industry, Computer science, Internet television, Digital radio, Broadcasting, Digital terrestrial television, law.invention, Terrestrial television, law, Digital broadcasting, Digital television, business, Telecommunications
Published: 2015
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209. MDP-based vertical handover scheme for indoor VLC-WiFi systems

Author: Zhaocheng Wang, Fang Wang, Zhixing Yang, Linglong Dai, and Chen Qian
Subjects: Vertical handover, Scheme (programming language), Computer science, business.industry, Real-time computing, Markov process, Energy consumption, Computer Science::Performance, symbols.namesake, Handover, Computer Science::Multimedia, Computer Science::Networking and Internet Architecture, symbols, Markov decision process, business, computer, Computer network, computer.programming_language
Abstract: This paper proposes an energy-efficient vertical handover scheme for hybrid VLC-WiFi systems. We formulate the problem as a Markov decision process and obtain the solution to achieve the optimal tradeoff between energy consumption and delay requirement.
Published: 2015
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210. A near-capacity MIMO-BICM scheme for digita terrestrial television broadcasting

Author: Kewu Peng, Zhixing Yang, Fang Yang, and Tao Cheng
Subjects: Computer science, business.industry, Real-time computing, MIMO, Data_CODINGANDINFORMATIONTHEORY, Broadcasting, EXIT chart, QAM, Amplitude, Terrestrial television, Bit error rate, Electronic engineering, Low-density parity-check code, business, Amplitude and phase-shift keying, Quadrature amplitude modulation, Computer Science::Information Theory, Phase-shift keying
Abstract: Multiple-input multiple-output (MIMO) is one of the key technologies for the next generation digital terrestrial television broadcasting (DTTB). This paper proposes a near-capacity MIMO bit-interleaved coded modulation (BICM) scheme for DTTB systems. The amplitude phase shift keying (APSK) constellation with Gray mapping is applied to the BICM scheme. From the perspective of average mutual information, APSK has the advantage of shaping gain compared to its quadrature amplitude modulation (QAM) counterpart. Moreover, a new kind of bit interleaver named bit mapping, which takes into account the unequal error protection of both APSK and low-density parity-check (LDPC) codes, is proposed to further improve the system performance. The tool of extrinsic information transfer chart is utilized to help analyze and design the optimal bit mapping. Bit error rate simulations are carried out to verify the superiority of the proposed MIMO system.
Published: 2015
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211. Performance analysis of hard iterative channel estimation in turbo equalization

Author: Zhixing Yang, Changyong Pan, Jun Wang, and Yongjun Deng
Subjects: Mathematical optimization, Multidisciplinary, Minimum mean square error, Mean squared error, Channel state information, Computer science, Bit error rate, Equalization (audio), Gradient descent, Algorithm, Upper and lower bounds, Computer Science::Information Theory, Communication channel
Abstract: Reasonable bit error rate performance requires perfect channel state information (CSI) in traditional turbo equalization (TE), which is hard to obtain in practice. Soft and hard iterative algorithms have been developed to address the channel estimation problem with the performance of the soft iterative channel estimate based on the recursive least square algorithm. This paper presents an analysis of the performance of hard iterative channel estimation (HICE) based on the least mean square algorithm. The analysis uses a cost function with the hard decision on the TE output. An iterative channel correction (ICC) algorithm based on the gradient descent algorithm is used to iteratively minimize the cost function. The simulation results agree with the theoretical lower bound for the mean square error (MSE) of the estimated channels. Simulations show that, given an imperfect CSI with an MSE below the upper bound, the linear minimum mean squared error TE (LMMSE-TE) using the ICC has only small performance degradation compared to that with a perfect CSI, while the traditional LMMSE-TE suffers from severe error floor effect even with more iterations.
Published: 2006
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212. On the Synchronization Techniques for Wireless OFDM Systems

Author: Changyong Pan, Yong Wang, Zhen Lu, Jianhua Ge, Bo Ai, and Zhixing Yang
Subjects: Orthogonal frequency-division multiplexing, Computer science, business.industry, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Data_CODINGANDINFORMATIONTHEORY, Clock synchronization, Synchronization, Packet switching, Frequency domain, Media Technology, Electronic engineering, Wireless, Data synchronization, Self-clocking signal, Electrical and Electronic Engineering, business
Abstract: The latest research works on the synchronization scheme for either continuous transmission mode or burst packet transmission mode for the wireless OFDM communications are overviewed in this paper. The typical algorithms dealing with the symbol timing synchronization, the carrier frequency synchronization as well as the sampling clock synchronization are briefly introduced and analyzed. Three improved methods for the fine symbol timing synchronization in frequency domain are also proposed, with several key issues on the synchronization for the OFDM systems discussed.
Published: 2006
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213. A General SFN Structure With Transmit Diversity for TDS-OFDM System

Author: Zhixing Yang, Jian Song, Changyong Pan, Jun Wang, Jian-Tao Wang, and Lin Yang
Subjects: Transmit diversity, Diversity gain, Computer science, Orthogonal frequency-division multiplexing, Digital Video Broadcasting, Media Technology, Electronic engineering, Single-frequency network, Fading, Data_CODINGANDINFORMATIONTHEORY, Electrical and Electronic Engineering, Frequency-division multiplexing, Data transmission
Abstract: In the digital television terrestrial broadcasting, the Single Frequency Network (SFN) has much advantage. SFN can serve an arbitrary large area with the same information broadcasted at the same frequency, resulting in the potential diversity gain. To improve the transmission performance of the Time Domain Synchronous-Orthogonal Frequency Division Multiplexing (TDS-OFDM) system in SFN, a general SFN structure with transmit diversity is introduced, theoretically analyzed and computer simulated. The proposed SFN structure is flexible to set up. Simulations show that this method can greatly improve the reliability of the signal transmission over the frequency selective fading channels and is suitable for the TDS-OFDM system in SFN.
Published: 2006
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214. Frames Theoretic Analysis of Zero-Padding OFDM Over Deep Fading Wireless Channels

Author: Zhixing Yang, Jian Song, Jun Wang, Lin Yang, and Jian Wang
Subjects: Signal processing, Orthogonal frequency-division multiplexing, Signal reconstruction, business.industry, Signal, Synchronization, Media Technology, Electronic engineering, Wireless, Fading, Electrical and Electronic Engineering, business, Algorithm, Mathematics, Communication channel
Abstract: The performance of the orthogonal frequency division multiplexing (OFDM) systems may be severely deteriorated when passing through wireless channels with the spectral nulls. Zero-Padding (ZP) for the OFDM signal guarantees the symbol recovery regardless of the channel spectral nulls if complicated ZP-OFDM-MMSE equalizer is used. In this paper we first establish a connection between ZP-OFDM and DFT codes and then two novel signal reconstruction schemes, signal projection and low-complexity signal reconstruction, are presented to deal with the spectral nulls based on the frames theory. The simulation results demonstrate that significant performance improvement can be achieved using our proposed methods over the so-called ZP-OFDM overlap and add (ZP-OFDM OLA) scheme.
Published: 2006
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215. ACE With Frame Interleaving Scheme to Reduce Peak-to-Average Power Ratio in OFDM Systems

Author: Changyong Pan, Zhixing Yang, and Haidong Fang
Subjects: Scheme (programming language), Interleaving, Orthogonal frequency-division multiplexing, Frame (networking), Process (computing), Interlacing, Data_CODINGANDINFORMATIONTHEORY, Transmission (telecommunications), Media Technology, Electronic engineering, Superframe, Electrical and Electronic Engineering, computer, computer.programming_language, Mathematics
Abstract: High peak-to-average power ratio (PAPR) is one of the major limitations to orthogonal frequency division multiplexing (OFDM) systems. In an OFDM system, as the frame size increases, the PAPR probability performance will get worse. The so-called active constellation extension (ACE) algorithm has been proposed to effectively reduce the PAPR especially when the number of sub-carriers is large. To achieve low PAPR with small number of sub-carriers, a novel scheme, ACE with frame interleaving, is proposed in this paper. In our proposal, M frames with N sub-carriers will be combined into one super frame, then ACE algorithm is applied to reduce the PAPR of the super frame, the super frame with lowered PAPR will finally be divided into M OFDM frames for the transmission. The combining and dividing process is equivalent to the time interleaving. The proposed scheme requires no side information and can significantly reduce PAPR while maintaining small number of sub-carriers.
Published: 2005
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216. Iterative padding subtraction of the PN sequence for the TDS-OFDM over broadcast channels

Author: Jian Song, Changyong Pan, Lin Yang, Zhixing Yang, and Jun Wang
Subjects: Intersymbol interference, Orthogonal frequency-division multiplexing, Computer science, Iterative method, Media Technology, Electronic engineering, Data_CODINGANDINFORMATIONTHEORY, Spectral efficiency, Electrical and Electronic Engineering, Padding, Cyclic prefix, Communication channel
Abstract: PN-sequence padding (PNP) TDS-OFDM transmission scheme has recently been proposed as an appealing alternative to the traditional cyclic prefix (CP) OFDM technology as it can provide significant improvement in the spectrum efficiency. In this paper, an iterative method is introduced to subtract the PN sequence padding for the TDS-OFDM systems to mitigate the residual inter symbol interference (ISI) from the imperfect channel estimation, and the inherent channel estimation techniques are also performed to track the channel changes. Results show that this iterative algorithm can effectively remove the impact from the residual ISI on the slow-fading broadcast channels, even in the presence of very large channel delays in the single-frequency simulcast networks (SFN).
Published: 2005
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217. Low-Complexity Equalization for TDS-OFDM Systems Over Doubly Selective Channels

Author: Lin Yang, Changyong Pan, Zhixing Yang, and Jian Fu
Subjects: Engineering, Computational complexity theory, Orthogonal frequency-division multiplexing, business.industry, Equalization (audio), Spectral efficiency, Interference (wave propagation), Multiplexing, Media Technology, Electronic engineering, Adjacent-channel interference, Electrical and Electronic Engineering, business, Computer Science::Information Theory, Communication channel
Abstract: Time variation of a multipath channel leads to interchannel interference (ICI) in orthogonal frequency-division multiplexing (OFDM) systems. It results in the performance degradation, therefore, limits the achievable throughput. Some methods have been proposed to suppress ICI, unfortunately, they are either computationally complex or at the price of spectral efficiency. In this paper, a low-complexity equalization method for time-domain synchronous OFDM (TDS-OFDM) systems is proposed under the assumption that the channel impulse response (CIR) varies in a linear fashion within a block period. The rationale behind our method is to use a finite power series expansion for the inverse of the equalization matrix. This method provides a desired tradeoff between the performance and the processing complexity. Theoretical analysis and simulation results demonstrate that the proposed method can effectively mitigate ICI caused by the channel variations with low computational complexity.
Published: 2005
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218. Effects of Nonlinear Distortion and Imperfect Parameters Estimation on the Performance of OFDM-Based DTTB Systems

Author: Zhixing Yang, Changyong Pan, Zi-Wei Zheng, and Yi-Sheng Zhu
Subjects: Computer science, Orthogonal frequency-division multiplexing, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Transmitter, Data_CODINGANDINFORMATIONTHEORY, Cable television, Cyclic prefix, Nonlinear distortion, Digital Video Broadcasting, Media Technology, Electronic engineering, Fading, Electrical and Electronic Engineering, Multipath propagation
Abstract: As an effective technique for combating multipath fading and for high-bit-rate transmission over wireless channels, orthogonal frequency-division multiplexing (OFDM) is extensively used in modern digital television terrestrial broadcasting (DTTB) systems, such as the cyclic prefix OFDM (CP-OFDM) based DVB-T DTTB systems and the time domain synchronous OFDM (TDS-OFDM) based DMB-T DTTB systems, to support high performance bandwidth-efficient multimedia services. OFDM-based DTTB systems are very sensitive to the nonlinear distortion at the transmitter and the imperfect parameters estimation at the receiver. In this paper, the combined effects of nonlinear distortion and imperfect parameters estimation on the performance of the OFDM-based DTTB systems are investigated, a closed form of symbol error probability of the OFDM-based DTTB systems with nonlinear distortion and imperfect parameters estimation is derived. Theoretical results show closely matching with those obtained by simulations for both the CP-OFDM based DVB-T DTTB systems and the TDS-OFDM based DMB-T DTTB systems.
Published: 2005
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219. Robust synchronization and channel estimation for the OFDM-based WLAN systems

Author: Zhixing Yang, Yi-Sheng Zhu, Changyong Pan, and Zi-Wei Zheng
Subjects: Computer science, Orthogonal frequency-division multiplexing, business.industry, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Data_CODINGANDINFORMATIONTHEORY, Synchronization, law.invention, Computer Science::Performance, Transmission (telecommunications), law, Wireless lan, Computer Science::Networking and Internet Architecture, Media Technology, Electronic engineering, Wireless, Wi-Fi, Fading, Electrical and Electronic Engineering, business, Multipath propagation, Computer Science::Information Theory, Communication channel
Abstract: As an effective technique for combating multipath fading and for high data rate transmission over wireless channels, orthogonal frequency division multiplexing (OFDM) is extensively used in wireless local area network (WLAN) systems to support high performance bandwidth-efficient multimedia services. In this paper, novel synchronization and channel estimation schemes are proposed for the OFDM-based WLAN systems. Analyses and simulation results show that the proposed schemes exhibit good performances and are robust in harsh fading channel environments and low signal-to-noise ratio (SNR) conditions.
Published: 2004
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220. Performance analysis of the OFDM-based systems with nonlinear distortion and imperfect parameters estimation

Author: Zhixing Yang, Changyong Pan, Zi-Wei Zheng, and Yi-Sheng Zhu
Subjects: Computer science, Orthogonal frequency-division multiplexing, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Transmitter, Data_CODINGANDINFORMATIONTHEORY, law.invention, Computer Science::Performance, Transmission (telecommunications), law, Nonlinear distortion, Digital Video Broadcasting, Computer Science::Networking and Internet Architecture, Media Technology, Electronic engineering, Wi-Fi, Electrical and Electronic Engineering, Quadrature amplitude modulation, Multipath propagation, Computer Science::Information Theory, Communication channel, Phase-shift keying
Abstract: As an effective technique for combating multipath fading and for high data rate transmission over wireless channels, orthogonal frequency division multiplexing (OFDM) is extensively used in high-rate wireless communication systems, such as, the wireless local area network (WLAN) and the digital television terrestrial broadcasting (DTTB) to support high performance bandwidth-efficient multimedia services. OFDM-based multi-carrier systems are much more sensitive to the nonlinear distortion at the transmitter and the imperfect parameters estimation at the receiver than the single carrier systems. In this paper, the compositive performance effects induced on the OFDM signal by the nonlinear distortion and the imperfect parameters estimation are investigated, a closed form of symbol error probability of the OFDM-based system with nonlinear distortion and imperfect parameters estimation is derived. Theoretical results show closely matching with those obtained by simulations for the OFDM-based system with QPSK, 16QAM, 64QAM modulations.
Published: 2004
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221. Channel estimation and interference suppression for uplink CDMA mobile communication systems

Author: Changyong Pan, Zhixing Yang, Yi-Sheng Zhu, and Zi-Wei Zheng
Subjects: Minimum mean square error, Computer Networks and Communications, Computer science, business.industry, Code division multiple access, Data_CODINGANDINFORMATIONTHEORY, Direct-sequence spread spectrum, CDMA spectral efficiency, Chip, Interference (wave propagation), Multiplexing, Antenna array, Telecommunications link, Computer Science::Networking and Internet Architecture, Electronic engineering, Wireless, Electrical and Electronic Engineering, business, Telecommunications, Multipath propagation, Computer Science::Information Theory, Information Systems, Data transmission, Communication channel
Abstract: Wireless communications for mobile telephone and data transmission is currently undergoing very rapid development. Code division multiple-access (CDMA) implemented with direct sequence spread spectrum signaling is among the most promising multiplexing technologies for cellular telecommunications services. In this paper, jointly period inserted pilot symbols assisted recursive (PIPSAR) channel estimation and interference suppression techniques are proposed for uplink CDMA mobile communication systems. The uplink CDMA mobile communication system model is described in the form of space-time domain through antenna array and multipath expression. Interference suppression is achieved by using adaptive minimum mean squared error (MMSE) digital filters that span several successive received chip oversampling vectors of a symbol interval. PIPSAR techniques are used to estimate channel parameters. The correlation between the successive periods is considered to further improve the performance of the proposed scheme. Analysis and simulations are used to evaluate the performance of the proposed scheme. Copyright © 2004 John Wiley & Sons, Ltd.
Published: 2004
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222. Novel Synchronization for TDS-OFDM-Based Digital Television Terrestrial Broadcast Systems

Author: Changyong Pan, Zhixing Yang, Yi-Sheng Zhu, and Zi-Wei Zheng
Subjects: business.industry, Orthogonal frequency-division multiplexing, Computer science, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Real-time computing, Data_CODINGANDINFORMATIONTHEORY, Multiplexing, Synchronization, Transmission (telecommunications), Computer Science::Networking and Internet Architecture, Media Technology, Electronic engineering, Frequency offset, Digital television, Electrical and Electronic Engineering, business, Multipath propagation, Computer Science::Information Theory, Data transmission
Abstract: As an effective technique for combating multipath fading and for high-bit-rate transmission over wireless channels, orthogonal frequency-division multiplexing (OFDM) is extensively used in modern digital television terrestrial broadcasting (DTTB) systems to support high performance bandwidth-efficient multimedia services. In this paper, novel synchronization schemes, including timing, frequency offset estimation, and phase error tracking, are proposed for the time domain synchronous OFDM (TDS-OFDM) based DTTB systems. Simulations under different channel situations verify the efficiency of the proposed schemes.
Published: 2004
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223. A Coding and Modulation Scheme for HDTV Services in DMB-T

Author: Jun Wang, Zhixing Yang, Changyong Pan, Meng Han, Lin Yang, and Ai-Dong Men
Subjects: Computer science, Orthogonal frequency-division multiplexing, Concatenated error correction code, Data_CODINGANDINFORMATIONTHEORY, Euclidean distance, Digital Video Broadcasting, Media Technology, Electronic engineering, Demodulation, Electrical and Electronic Engineering, Trellis modulation, Quadrature amplitude modulation, Decoding methods, Computer Science::Information Theory
Abstract: In this paper a channel coding and modulation scheme for providing HDTV broadcasting services is presented, which adopts BICM structure as inner code in connection with 64QAM constellation and OFDM transmission. A new mapping method is designed to maximize the minimum Euclidean distance between signal points divided by feedback bits, thus an iterative algorithm between demodulator and decoder can be performed to acquire performance improvement. Analysis, simulation and laboratory test results have proved that the proposed system has good SNR performance in both AWGN and multipath channels.
Published: 2004
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224. A combined code acquisition and symbol timing recovery method for tds-ofdm

Author: Changyong Pan, Zhixing Yang, Meng Han, Jun Wang, and Lin Yang
Subjects: Computer science, Orthogonal frequency-division multiplexing, Data_CODINGANDINFORMATIONTHEORY, Synchronization, symbols.namesake, Additive white Gaussian noise, Digital Video Broadcasting, Media Technology, symbols, Electronic engineering, Frequency offset, Detection theory, Time domain, Electrical and Electronic Engineering, Data transmission
Abstract: A novel timing recovery method which combines code acquisition and symbol timing recovery for TDS-OFDM (time domain synchronous OFDM) is developed. The method is based on the searching and tracking of the correlation peaks of the PN sequences embedded in the signals. Simulations show that this algorithm has very good performance for both AWGN and multipath channels, even when a small frequency offset exists in the sampling clock of the receiver.
Published: 2003
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225. Design of a novel optical tomography sensor array

Author: Shurong Lai, Zhixing Yang, Yanbiao Liao, and Chunsheng Yan
Subjects: Process tomography, Optical fiber, Pixel, medicine.diagnostic_test, business.industry, Computer science, Applied Mathematics, Process (computing), Measure (physics), law.invention, Optics, Sensor array, law, Fiber optic sensor, medicine, Electronic engineering, Optical tomography, business, Instrumentation, Engineering (miscellaneous)
Abstract: In this paper, we put forward novel theories and their empirical formulae for pixel distribution and plane-light-path design in optical fibre process tomography (OFPT), by which the novel OFPT structure parameters can be easily calculated according to the engineering requirements. The designed OFPT system can be used in the circular cross-section of cylindrical space in industry process monitoring and control to measure the medium distribution and contents, such as measurements for two-phase flows.
Published: 2003
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226. Improved frame structure for TDS-OFDM systems

Author: Zhixing Yang, Zhaocheng Wang, and Chao Zhang
Subjects: Orthogonal frequency-division multiplexing, Frame (networking), Guard interval, Electronic engineering, Structure (category theory), Spectral efficiency, Electrical and Electronic Engineering, Delay spread, Block (data storage), Communication channel, Mathematics
Abstract: An improved frame structure for TDS-OFDM systems is presented by adopting cyclic block shifted training sequences. The guard interval needed for the training sequences could be shortened while the ability to combat the maximum channel delay spread is not sacrificed. Therefore the spectrum efficiency is increased. The corresponding channel estimation and equalisation schemes are also illustrated.
Published: 2012
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227. A Flexible Superframe Structure Supporting Localization for TDS-OFDM

Author: Zhixing Yang, Ruifeng Ma, and Zhaocheng Wang
Subjects: Computer Networks and Communications, Orthogonal frequency-division multiplexing, Computer science, Electronic engineering, Structure (category theory), Superframe, Electrical and Electronic Engineering, Software
Published: 2012
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228. Design of a 3780-point IFFT processor for TDS-OFDM

Author: Changyong Pan, Zhixing Yang, Lin Yang, and Hu Yupeng
Subjects: Data stream, Digital signal processor, Computer science, Orthogonal frequency-division multiplexing, business.industry, Circuit design, Pipeline (computing), Media Technology, Electronic engineering, Algorithm design, Electrical and Electronic Engineering, business, Field-programmable gate array, Throughput (business), Computer hardware
Abstract: This correspondence presents a design of 3780-point IFFT processor for TDS-OFDM terrestrial DTV transmitter using FPGA. It demonstrates the algorithm design and error analysis of the processor, which can achieve a throughput of 7.56M complex IFFT operations per second. This design meets the signal-to-quantization noise ratio requirement of the TDS-OFDM system. It consists of two FPGA and one dual-port RAM. The data stream pipeline algorithm is implemented.
Published: 2002
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229. APSK Constellation with Gray Mapping

Author: Zhixing Yang, Zaishuang Liu, Qiuliang Xie, and Kewu Peng
Subjects: business.industry, Mutual information, Computer Science Applications, QAM, Modeling and Simulation, Digital Video Broadcasting, Bit error rate, Turbo code, Electrical and Electronic Engineering, Telecommunications, business, Algorithm, Amplitude and phase-shift keying, Quadrature amplitude modulation, Phase-shift keying, Mathematics
Abstract: Amplitude phase shift keying (APSK) constellation is superior to its quadrature amplitude modulation (QAM) counterpart from the mutual information point of view. However, due to the lack of Gray mapping, it introduces high independent demapping loss. In this letter, a special kind of APSK constellations with Gray mapping (Gray-APSK) is proposed, which provides considerable shaping gain compared with the QAM constellations with Gray mapping (Gray-QAM) in both independent and iterative demapping scenarios, as verified by average mutual information analysis and bit error rate simulations.
Published: 2011
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230. Performance analysis of DVB-NGH MIMO coded modulation system

Author: Fang Yang, Zhixing Yang, Tao Cheng, and Kewu Peng
Subjects: 3G MIMO, Computer science, business.industry, Coded modulation, MIMO, Digital Video Broadcasting, Electronic engineering, Telecommunications, business
Published: 2014
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231. Reliable and energy-efficient OFDM based on structured compressive sensing

Author: Zhaocheng Wang, Guan Gui, Zhixing Yang, Linglong Dai, and Fumiyuki Adachi
Subjects: Channel allocation schemes, Computer science, business.industry, Orthogonal frequency-division multiplexing, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Data_CODINGANDINFORMATIONTHEORY, Spectral efficiency, Cyclic prefix, Single antenna interference cancellation, Guard interval, Electronic engineering, Wireless, Fading, business, Communication channel, Computer network
Abstract: Compared with standard cyclic prefix OFDM (CP-OFDM), time domain synchronous OFDM (TDS-OFDM) can achieve a higher spectrum efficiency by using the known training sequence instead of CP as the guard interval. However, TDS-OFDM suffers from reduced energy efficiency and performance loss due to the existing mutual inferences. In this paper, based on the newly emerging theory of structured compressive sensing (SCS), we propose a reliable and energy-efficient TDS-OFDM transmission scheme with reduced guard interval power (which is impossible for CP-OFDM) by designing a channel estimation scheme with high accuracy. The wireless channel properties including channel sparsity and inter-channel correlation, which are usually not considered in conventional OFDM schemes, have been exploited. We further exploit the worst-case system design principle to extract multiple interference-free regions of small size to simultaneously reconstruct multiple channels of large size without iterative interference cancellation. In this way, the guard interval power in TDS-OFDM can be reduced to achieve a 20% higher energy efficiency than standard CP-OFDM, and the system reliability can be also improved in fast fading channels.
Published: 2014
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232. Search for gravitational wave ringdowns from perturbed intermediate mass black holes in LIGO-Virgo data from 2005?2010

Author: Li-Wei Wei, Kenneth A. Strain, Fabio Marchesoni, Kyungmin Kim, G. Quiroga, Yi Pan, K. E. Ramirez, Michael L. Gorodetsky, Michaela Pickenpack, Simon Stevenson, David Hammer, Joseph O'Dell, Hartmut Grote, G. Losurdo, Albrecht Ruediger, Neil J. Cornish, Peter Aufmuth, Jiayi Qin, Sammanani S. Premachandra, Jamie Scott, V. Re, Bruce Gendre, Robinjeet Singh, M. Yvert, T. D. Abbott, Jong H. Chow, Ludovico Carbone, P. Couvares, Benno Willke, J. Bauchrowitz, F. Garufi, Cristina Torres, Denis Martynov, S. G. Crowder, Federico Ferrini, Marco Colombini, A. F. Brooks, Q. Chu, Szymon Steplewski, Gerardo Moreno, Chunnong Zhao, J. Macarthur, Karen Roland, G. Vajente, David H. Shoemaker, M. Tse, D. M. Macleod, M. Meinders, W. D. Vousden, Gianpietro Cagnoli, L. Wallace, J. Poeld, R. Frey, Christophe Collette, Zhixing Yang, Evan Ochsner, Vicky Kalogera, Larry R. Price, Elaine Rhoades, Adrien Le Roux, Ajay Kumar, M. Leonardi, Carl Adams, C. Belczynski, M. A. Barton, Alessandra Buonanno, Brian O'Reilly, D. B. Kelley, Matteo Lorenzini, Linqing Wen, S. E. Zuraw, C. Palomba, R. Chakraborty, B. L. Swinkels, D. Verkindt, G. Kang, Christelle Buy, César A. Costa, Xing Zhu, S. Privitera, F. Vetrano, M. K. Haris, T. Vo, C. Bradaschia, P. Oppermann, Michele Vallisneri, M. S. Shahriar, Joris van Heijningen, Sascha Husa, Sonali Mohapatra, P. T. Beyersdorf, Andrew Lundgren, Eliu Huerta, Szabolcs Marka, Timothy A Welborn, M. T. Hartman, V. Kringel, Marica Branchesi, N. Straniero, Alessio Rocchi, D. R. Ingram, Ryan Fisher, Ivan Maksimovic, K. Siellez, A. Conte, Steffen Kaufer, Jo van den Brand, Daniel Amariutei, Saps Buchman, L. Sammut, A. Ain, D. Bersanetti, K. Mailand, K. A. Hodge, Marilyne Andersen, Mauro Tonelli, Kip S. Thorne, T. Chalermsongsak, Alessandro Bertolini, Duncan Meacher, B. Shapiro, Jonathan F. Stebbins, Heinz-Bernd Eggenstein, Zhihui Du, V. P. Mitrofanov, Sanjit Mitra, R. Mittleman, Sharad Gaonkar, Ik Siong Heng, Cyrus Reed, T. Z. Summerscales, Nelson Christensen, Sunil Susmithan, Oliver Puncken, Tyson Littenberg, D. Lodhia, Neil Gehrels, R. Lynch, V. Boschi, Hee Cho, Kasem Mossavi, Deepak Nanda Kumar, Grant David Meadors, R. Coyne, Haixing Miao, S. L. Danilishin, G. Bogaert, M. Shaltev, D. C. Coyne, J. Aasi, Jade Powell, David H. Reitze, Yi-Ming Hu, Sweta Shah, K. Izumi, D. Passuello, Nicolas Leroy, M. Barsuglia, E. O. Lebigot, Vuk Mandic, Alberto Di Lieto, Ignacio Santiago-Prieto, G. Vedovato, W. Katzman, S. E. Dwyer, David Keitel, Richard Gustafson, Suvadeep Bose, Z. Márka, Tomasz Bulik, Alexander Ivanov, C. Affeldt, P. Thomas, Jean-Pierre Zendri, Trevor Sidery, H. Heitmann, Ryan DeRosa, V. Loriette, Francesco Salemi, Pierre-François Cohadon, V. Litvine, Gurumurthy Rajalakshmi, O. Bock, István Rácz, K. L. Dooley, Sabrina D'Antonio, Joshua Yablon, Warren Anderson, Eric K. Gustafson, Sina Koehlenbeck, Jocelyn Read, F. Carbognani, J. Logue, H. J. Bulten, S. Gossler, David Kinzel, Almir Alemic, P. J. Veitch, Amber Stuver, Sanichiro Yoshida, Badri Krishnan, T. P. Bodiya, C. Vorvick, Marc Normandin, Ettore Majorana, Gary McIntyre, M. Edwards, Peter Wessels, Rosa Poggiani, Erik Katsavounidis, Namjun Kim, François Bondu, P. Leaci, A. Colla, Sean Morriss, M. Factourovich, P. Astone, J. Betzwieser, V. Kondrashov, Lisa Barsotti, Bala R. Iyer, Kieran Craig, Shaun Hooper, Valeria Malvezzi, Warren W. Johnson, Jay Marx, Antoine Heidmann, Piotr Jaranowski, Florent Robinet, P. Raffai, Kyle Ryan, Mark Barbet, Samuel Franco, Eric Thrane, Eric W. James, Manasadevi Thirugnanasamba, Sarah Caudill, E. Goetz, Scott Koranda, T. t. Fricke, J. B. Kanner, A. R. Wade, Rainer Weiss, Xu Chen, G. Bergmann, L. Matone, T. Dayanga, Martin van Beuzekom, Les Wade, Irene Di Palma, Young-Min Kim, Albert Lazzarini, Anthony Kremin, Fausto Acernese, Rajesh Kumar, R. J. G. Jonker, H. Overmier, Robert M. S. Schofield, Jessica McIver, Sang Oh, G. Mazzolo, G. Kuehn, D. Barker, K. Wette, F. Ricci, N. Mazumder, R. Quitzow-James, R. Day, Vladimir B. Braginsky, Maik Frede, C. C. Yancey, Giacomo Ciani, A. Mullavey, John J. Oh, D. Sellers, Alastair Grant, N. Morgado, H. Vahlbruch, A. Cumming, C. M. Mow-Lowry, H. Fehrmann, J. Meidam, Lisa M. Goggin, K. Riles, F. Ohme, S. J. Chamberlin, Sergey P. Vyatchanin, Calum Torrie, J. Hanks, J. Y. Vinet, Archana Pai, E. J. King, Hyun Lee, B. P. Abbott, Andrea Moggi, Jean-Daniel Fournier, Rory Smith, Hernan Daveloza, D. Sigg, S. W. Ballmer, Edwin J. Son, D. Ugolini, S. Vass, F. Paoletti, P. Ruggi, J. Eichholz, M. J. Cowart, Keiko Kokeyama, Riccardo Sturani, Andrzej Królak, Laurent Pinard, Fumiko Kawazoe, Tristan Briant, Benjamin William Allen, Stefan Hild, Y. Ma, E. Genin, N. D. Smith-Lefebvre, Graham Woan, Stuart Reid, Steven D. Penn, Yuri Minenkov, Laura Cadonati, Mohana Mageswaran, Veronica Lockett, N. Letendre, Karsten Danzmann, C. Aulbert, R. Cavalieri, Scott Dossa, H. Wittel, Walter Del Pozzo, Riccardo DeSalvo, C. Messenger, Bastian Schulz, R. Vincent-Finley, Jeffery Kline, H. Radkins, J. D. Lough, S. T. Countryman, S. H. Huttner, Fabrice Matichard, W. Kells, Jacob Scheuer, M. Jacobson, M. Weinert, P. Campsie, Michelle E. Walker, J. Birch, Katrin Dahl, A. Libson, M. Punturo, D. Hoak, D. Sentenac, Patrick Brady, Leopoldo Milano, Slawomir Gras, F. Fidecaro, S. Biscans, Fred Raab, Valentina D. Mangano, P. Baker, M. Mantovani, Andrew Melatos, E. Saracco, A. Brillet, Gary Hemming, Michail Agathos, A. Masserot, Santiago Caride, C. L. Mueller, B. Behnke, Matthew Heintze, Richard L. Savage, Alberto Vecchio, G. M. Harry, E. Oelker, K. Venkateswara, Benjamin Aylott, Daniel Kozak, Martina Neri, A. S. Bell, John Miller, T. Prestegard, Charles Celerier, Craig Lawrie, Lee Samuel Finn, Fafhan Feroz, Soma Mukherjee, R. L. McCarthy, Yuri Levin, Thanh Vinh Nguyen, David Blair, Vincenzo Dattilo, E. Coccia, C. Graef, B. A. Weaver, Dmitry Simakov, M. Brinkmann, L. Prokhorov, Will M. Farr, Elisabetta Cesarini, Troy Williams, Neil Gordon, Patrice Hello, Nancy Aggarwal, Robert Stone, Jordan Camp, James S. Clark, M. J. Hart, Richard O'Shaughnessy, B. Barr, Malik Rakhmanov, A. Pasqualetti, Roman Schnabel, J. G. Rollins, F. Y. Khalili, F. Travasso, Michał Bejger, Timo Denker, Luke Williams, J. C. Driggers, L. Austin, A. M. Gretarsson, A. R. Williamson, D. Feldbaum, S. Verma, A. Mytidis, J. E. Brau, L. Martinelli, Susan M. Scott, F. Marion, Efim A. Khazanov, Michael Thomas, A. Effler, Xiaoge Wang, Irene Fiori, G. Ballardin, Moritz Mehmet, David Stops, David Coward, Li Ju, Oleg Palashov, Daniel A. Shaddock, Adam Mercer, A. Basti, Philipp Moesta, Michael Rodruck, A. Allocca, Vincent Dolique, G. Valdes, Walter Winkler, Huan Yang, A. Perreca, M. Drago, B. Hughey, B. J. J. Slagmolen, Sheon Chua, M. Phelps, C. J. Guido, Paul Hopkins, Chiara M. F. Mingarelli, A. S. Markosyan, J. Hanson, Robert Taylor, B. C. Stephens, Mátyás Vasúth, Koji Arai, P. G. Murray, Cody Arceneaux, Fan Zhang, Brian Moe, Guenakh Mitselmakher, Vaibhav Tiwari, Shin Chung, E. Chassande-Mottin, Martin Mohan, Th. Bauer, Michael E Zucker, D. S. Rabeling, Ron Burman, Riccardo Bassiri, Joseph Gleason, V. Fafone, Guido Mueller, Tito Dal Canton, Christophe Michel, Sheila Rowan, Massimiliano Bitossi, Timothy MacDonald, Alan G. Wiseman, K. E. Gushwa, Fabien Kéfélian, E. Maros, J. H. Hough, Rocco Romano, Kendall Ackley, R. K. Nayak, Chad Hanna, M. Kasprzack, Paul Fulda, Ling Kuo, G. Debreczeni, S. E. Gossan, Shane L. Larson, F. Clara, Mary West, F. Magaña-Sandoval, J.-P. Coulon, M. Was, Susanne Milde, A. Staley, H. Vocca, Roy Williams, M. Tacca, Kipp Cannon, Carl-Johan Haster, A. Giazotto, E. Schreiber, Todd Adams, Roland Schilling, Matthew Evans, E. Cuoco, Douglas R. Cook, David Murphy, T. Isogai, R. S. Ottens, Ilaria Nardecchia, Michele Zanolin, S. Doravari, Ilya Mandel, Alex Nitz, Igor Neri, Jaclyn Sanders, J. S. Areeda, V. Sequino, Ruth A. Anderson, P. Kwee, Jeffrey Lewis, Fabrizio Barone, Jesper Munch, Leo Singer, Eugeniy E. Mikhailov, T. J. Massinger, R. Inta, R. W. P. Drever, C. Padilla, I. Ferrante, C. Mishra, J. K. Blackburn, Stephen S. Eikenberry, Innocenzo M. Pinto, J. Marque, Kat Grover, H. J. Jang, K. Haughian, S. Klimenko, Charlotte Bond, I. Kowalska, R. L. Ward, A. L. Lombardi, Corey Gray, M. Heurs, M. Boer, J. Steinlechner, A. S. Sengupta, P. Charlton, Gianluca Gemme, S. C. McGuire, Zsolt Frei, Marine Ducrot, G. D. Hammond, Anatoly Poteomkin, Angie Lin, M. Lormand, Máté Nagy, Sarah Recchia, R. Essick, D. Rosińska, S. P. Tarabrin, P. Puppo, D. Talukder, Nam Gyu Kim, M. Prijatelj, Jan Harms, R. Passaquieti, Marie-Anne Bizouard, G. Manca, Richard A. Matzner, S. Kandhasamy, B. Sorazu, Eric Quintero, J. C. Barayoga, R. Gouaty, Alexander Khalaidovski, E. Macdonald, Anthony Castiglia, Rosario DeRosa, H. Yamamoto, H. R. Paris, G. A. Prodi, John Worden, Alessandra Corsi, Viswanath Bavigadda, Nergis Mavalvala, Francisco Jimenez-Forteza, M. H. Wimmer, J. Greenhalgh, Chris Pankow, Junghyun Lee, F. Piergiovanni, Jerome Degallaix, Chang-Hwan Lee, Giancarlo Cella, A. Kutynia, C. Bogan, Tarun Souradeep, B. Mours, E. J. Daw, A. Gennai, A. Chiummo, F. Nocera, D. J. White, Alicia M. Sintes, Mark Lubinski, Igor Yakushin, M. Davier, J. Prasad, S. Grunewald, Kevin M. McLin, Nary-Catherine Man, Luca Gammaitoni, Andrea Chincarini, Steven Bloemen, Paolo Addesso, K. D. Giardina, M. Razzano, M. Born, D. Buskulic, Virginio Sannibale, David E. McClelland, C. Gill, Angela Di Virgilio, Jonathan R. Gair, Chris Van Den Broeck, N. A. Lockerbie, M. Damjanic, F. Martelli, Michael Smith, Kenneth G. Libbrecht, Husne Dereli, Harald Lueck, F. Cleva, S. Meshkov, S. Farinon, Tjonnie G. F. Li, Eric Howell, Huang-Wei Pan, Gijs Nelemans, T. B. Edo, Thomas Dent, Vladimir Dergachev, Eric D. Black, Jolien D. E. Creighton, Lindy Blackburn, S. Frasca, Michael Landry, James Whelan, P. Ajith, M. Cordier, N. A. Robertson, C. Lazzaro, K. Holt, Alan J. Weinstein, Chunglee Kim, I. A. Bilenko, S. Leavey, Stephen Fairhurst, Juan Calderón Bustillo, M. R. Abernathy, Kema Williams, Peter Fritschel, David J. Ottaway, G. Billingsley, David Hosken, L. Bosi, Peter Kalmus, B. Lantz, J. R. Leong, M. C. Díaz, Philip Graff, Tania Regimbau, Y. Ji, M. M. Hanke, C. Maglione, Ruslan Vaulin, Dirk Schuette, David B. Tanner, Stuart Anderson, T. P. Downes, M. Pedraza, K. Loew, Maria Alessandra Papa, F. Cavalier, M. Pichot, Collin Capano, Matthew Benacquista, Enrico Calloni, G. Traylor, Thomas Corbitt, Gabor Endroczi, Benjamin J. Owen, Gareth S. Davies, W. Z. Korth, Martin Hendry, Christopher Wipf, K. V. Tokmakov, Martin Hewitson, Junwei Cao, Alexander Corpuz, Bernard F. Whiting, Tobias Westphal, David Jones, Stan Whitcomb, Joseph A. Giaime, Marco Cavaglia, Patrick J. Sutton, F. Frasconi, C. R. Ramet, R. Flaminio, Odylio D. Aguiar, Abraham Singer, I. 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Smith, R. Bork, L. R. Cominsky, Axel Donath, Tobias Eberle, M. MacInnis, Gianluca Guidi, S. Raja, S. E. Strigin, Bruce Levine, G. M. Keiser, Benjamin Farr, Christian Cepeda, P. Rapagnani, Andreas Freise, Vincenzo Pierro, Alexander Sergeev, Paul D. Lasky, John Karlen, Joshua L. Willis, J. Zweizig, Carol Wilkinson, Laura Nuttall, G. Mendell, Matthew Pitkin, Liyuan Zhang, M. Wade, Sebastian Steinlechner, C. Osthelder, Karel E. Urbanek, D. O. Bridges, M. Granata, Prayush Kumar, G. P. Newton, M. Fyffe, Gabriela Gonzalez, I. W. Harry, Shiuh Chao, Gleb Romanov, Jim Batch, Adam Zadrozny, M. G. Beker, Qi Fang, V. Necula, Luciano Di Fiore, V. V. Frolov, V. Sandberg, K. A. Thorne, Benoit Sassolas, Stanislav Babak, M. Constancio, Duncan A. Brown, M. Wang, APC - Cosmologie, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Observatoire de Paris, Université Paris sciences et lettres (PSL), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Astrophysique Relativiste Théories Expériences Métrologie Instrumentation Signaux (ARTEMIS), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique de Rennes (IPR), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des matériaux avancés (LMA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), APC - Gravitation (APC-Gravitation), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Max-Planck-Gesellschaft-Max-Planck-Gesellschaft, Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Universitá degli Studi dell’Insubria = University of Insubria [Varese] (Uninsubria), IVC Lab, Lenovo Research, Lenovo, European Synchrotron Radiation Facility (ESRF), Physique Corpusculaire et Cosmologie - Collège de France ( PCC ), Collège de France ( CdF ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ) -Collège de France ( CdF ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Paris Diderot - 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CNRS ) -Observatoire de la Côte d'Azur, Université Côte d'Azur ( UCA ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Physique de Rennes ( IPR ), Université de Rennes 1 ( UR1 ), Université de Rennes ( UNIV-RENNES ) -Université de Rennes ( UNIV-RENNES ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire des matériaux avancés ( LMA ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire d'Annecy de Physique des Particules ( LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Savoie Mont Blanc ( USMB [Université de Savoie] [Université de Chambéry] ) -Centre National de la Recherche Scientifique ( CNRS ), AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), APC - Gravitation ( APC-Gravitation ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Max-Planck-Institut-Max-Planck-Institut, ESPCI ParisTech, Universitá degli Studi dell’Insubria, European Synchrotron Radiation Facility ( ESRF ), Aasi, J., Abbott, B. P., Abbott, R., Abbott, T., Abernathy, M. R., Acernese, F., Ackley, K., Adams, C., Adams, T., Addesso, P., Adhikari, R. X., Affeldt, C., Agathos, M., Aggarwal, N., Aguiar, O. D., Ain, A., Ajith, P., Alemic, A., Allen, B., Allocca, A., Amariutei, D., Andersen, M., Anderson, R., Anderson, S. B., Anderson, W. G., Arai, K., Araya, M. C., Arceneaux, C., Areeda, J., Aston, S. M., Astone, P., Aufmuth, P., Aulbert, C., Austin, L., Aylott, B. E., Babak, S., Baker, P. T., Ballardin, G., Ballmer, S. W., Barayoga, J. C., Barbet, M., Barish, B. C., Barker, D., Barone, F., Barr, B., Barsotti, L., Barsuglia, M., Barton, M. A., Bartos, I., Bassiri, R., Basti, A., Batch, J. C., Bauchrowitz, J., Bauer, T. h. S., Bavigadda, V., Behnke, B., Bejger, M., Beker, M. G., Belczynski, C., Bell, A. S., Bell, C., Benacquista, M., Bergmann, G., Bersanetti, D., Bertolini, A., Betzwieser, J., Beyersdorf, P. T., Bilenko, I. A., Billingsley, G., Birch, J., Biscans, S., Bitossi, M., Bizouard, M. A., Black, E., Blackburn, J. K., Blackburn, L., Blair, D., Bloemen, S., Bock, O., Bodiya, T. P., Boer, M., Bogaert, G., Bogan, C., Bond, C., Bondu, F., Bonelli, L., Bonnand, R., Bork, R., Born, M., Boschi, V., Sukanta, Bose, Bosi, L., Bradaschia, C., Brady, P. R., Braginsky, V. B., Branchesi, M., Brau, J. E., Briant, T., Bridges, D. O., Brillet, A., Brinkmann, M., Brisson, V., Brooks, A. F., Brown, D. A., Brown, D. D., Brckner, F., Buchman, S., Bulik, T., Bulten, H. J., Buonanno, A., Burman, R., Buskulic, D., Buy, C., Cadonati, L., Cagnoli, G., Caldern Bustillo, J., Calloni, Enrico, Camp, J. B., Campsie, P., Cannon, K. C., Canuel, B., Cao, J., Capano, C. D., Carbognani, F., Carbone, L., Caride, S., Castiglia, A., Caudill, S., Cavagli, M., Cavalier, F., Cavalieri, R., Celerier, C., Cella, G., Cepeda, C., Cesarini, E., Chakraborty, R., Chalermsongsak, T., Chamberlin, S. J., Chao, S., Charlton, P., Chassande Mottin, E., Chen, X., Chen, Y., Chincarini, A., Chiummo, A., Cho, H. S., Chow, J., Christensen, N., Chu, Q., Chua, S. S. Y., Chung, S., Ciani, G., Clara, F., Clark, J. A., Cleva, F., Coccia, E., Cohadon, P. F., Colla, A., Collette, C., Colombini, M., Cominsky, L., Constancio, M., Conte, A., Cook, D., Corbitt, T. R., Cordier, M., Cornish, N., Corpuz, A., Corsi, A., Costa, C. A., Coughlin, M. W., Coughlin, S., Coulon, J. P., Countryman, S., Couvares, P., Coward, D. M., Cowart, M., Coyne, D. C., Coyne, R., Craig, K., Creighton, J. D. E., Crowder, S. G., Cumming, A., Cunningham, L., Cuoco, E., Dahl, K., Dal Canton, T., Damjanic, M., Danilishin, S. L., Dantonio, S., Danzmann, K., Dattilo, V., Daveloza, H., Davier, M., Davies, G. S., Daw, E. J., Day, R., Dayanga, T., Debreczeni, G., Degallaix, J., Delglise, S., Del Pozzo, W., Denker, T., Dent, T., Dereli, H., Dergachev, V., DE ROSA, Rosario, Derosa, R. T., Desalvo, R., Dhurandhar, S., Daz, M., Di Fiore, L., Di Lieto, A., Di Palma, I., Di Virgilio, A., Dolique, V., Donath, A., Donovan, F., Dooley, K. L., Doravari, S., Dossa, S., Douglas, R., Downes, T. P., Drago, M., Drever, R. W. P., Driggers, J. C., Du, Z., Ducrot, M., Dwyer, S., Eberle, T., Edo, T., Edwards, M., Effler, A., Eggenstein, H., Ehrens, P., Eichholz, J., Eikenberry, S. S., Endrczi, G., Essick, R., Etzel, T., Evans, M., Evans, T., Factourovich, M., Fafone, V., Fairhurst, S., Fang, Q., Farinon, S., Farr, B., Farr, W. M., Favata, M., Fehrmann, H., Fejer, M. M., Feldbaum, D., Feroz, F., Ferrante, I., Ferrini, F., Fidecaro, F., Finn, L. S., Fiori, I., Fisher, R. P., Flaminio, R., Fournier, J. D., Franco, S., Frasca, S., Frasconi, F., Frede, M., Frei, Z., Freise, A., Frey, R., Fricke, T. T., Fritschel, P., Frolov, V. V., Fulda, P., Fyffe, M., Gair, J., Gammaitoni, L., Gaonkar, S., Garufi, Fabio, Gehrels, N., Gemme, G., Gendre, B., Genin, E., Gennai, A., Ghosh, S., Giaime, J. A., Giardina, K. D., Giazotto, A., Gill, C., Gleason, J., Goetz, E., Goetz, R., Goggin, L. M., Gondan, L., Gonzlez, G., Gordon, N., Gorodetsky, M. 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Subjects: SPACE-TELESCOPE EVIDENCE, Physics and Astronomy (miscellaneous), Astronomy, Pacs number: 04.70.-s, Astrophysics, 01 natural sciences, Pacs number: 04.80.Nn, General Relativity and Quantum Cosmology, Gravitation, GLOBULAR-CLUSTER M15, Gravitational waves, black holes, interferometer, CORE, Quantum Cosmology, gravitational wave, 010303 astronomy & astrophysics, EQUATIONS, QC, QB, Physics, Pacs number: 07.05.Kf, Oscillation, Settore FIS/01 - Fisica Sperimentale, CANDIDATE, Nuclear and High Energy Physics, PERTURBATIONS, Pacs number: 95.85.Sz, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], Gravitational wave, General Relativity, Stellar mass, General relativity, MERGERS, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), Astrophysics::Cosmology and Extragalactic Astrophysics, [ PHYS.GRQC ] Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], Settore FIS/05 - Astronomia e Astrofisica, 0103 physical sciences, FIELD, COLLAPSE, Astrophysics::Galaxy Astrophysics, 010308 nuclear & particles physics, BINARY, Mass ratio, LIGO, 13. Climate action, Globular cluster, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: We report results from a search for gravitational waves produced by perturbed intermediate mass black holes (IMBH) in data collected by LIGO and Virgo between 2005 and 2010. The search was sensitive to astrophysical sources that produced damped sinusoid gravitational wave signals, also known as ringdowns, with frequency $50\le f_{0}/\mathrm{Hz} \le 2000$ and decay timescale $0.0001\lesssim \tau/\mathrm{s} \lesssim 0.1$ characteristic of those produced in mergers of IMBH pairs. No significant gravitational wave candidate was detected. We report upper limits on the astrophysical coalescence rates of IMBHs with total binary mass $50 \le M/\mathrm{M}_\odot \le 450$ and component mass ratios of either 1:1 or 4:1. For systems with total mass $100 \le M/\mathrm{M}_\odot \le 150$, we report a 90%-confidence upper limit on the rate of binary IMBH mergers with non-spinning and equal mass components of $6.9\times10^{-8}\,$Mpc$^{-3}$yr$^{-1}$. We also report a rate upper limit for ringdown waveforms from perturbed IMBHs, radiating 1% of their mass as gravitational waves in the fundamental, $\ell=m=2$, oscillation mode, that is nearly three orders of magnitude more stringent than previous results., Comment: for the science summary, see http://www.ligo.org/science/Publication-S5S6RD/index.php
Published: 2014
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233. Closed-form analysis of linearly constrained CMA-based blind multiuser detector

Author: Zhixing Yang, Zuqiang Tang, and Yan Yao
Subjects: Signal processing, Code division multiple access, Speech recognition, White noise, Computer Science Applications, Spread spectrum, symbols.namesake, Additive white Gaussian noise, Gaussian noise, Modeling and Simulation, Convergence (routing), symbols, Detection theory, Electrical and Electronic Engineering, Algorithm, Computer Science::Information Theory, Mathematics
Abstract: In this letter, we present a performance analysis of the blind adaptive multiuser detector (MUD) proposed in Miguez and Casredo (1998), which is based on the linearly constrained constant modulus (LCCM) criterion. Global convergence of the algorithm with additive white Gaussian noise (AWGN) is proved and two approximate closed-form solutions of the optimum tap-weight vector are derived. Also the validity of analysis is demonstrated by comparing analytical results with simulated results.
Published: 2000
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234. Channel Estimation Based on Space-Time-Frequency Coded Training Sequence for Transmit Diversity System

Author: Jintao Wang, Zhixing Yang, Fang Yang, Jian Song, and Kewu Peng
Subjects: Sequence, Computer Networks and Communications, Estimation theory, Computer science, Training (meteorology), Data_CODINGANDINFORMATIONTHEORY, Space time frequency, Delay spread, Transmit diversity, Electrical and Electronic Engineering, Algorithm, Software, Simulation, Computer Science::Information Theory, Communication channel
Abstract: A novel transmit diversity scheme with space-time-frequency coded training sequence is proposed to perform channel estimation flexibly over doubly selective channel, which offers a trade-off between maximum delay spread and maximum Doppler spread. Simulation results are presented to verify the effectiveness of the proposed flexible channel estimation method under different propagation conditions.
Published: 2009
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235. Channel Estimation for TDS-OFDM System with Transmit Diversity

Author: Jian Song, Kewu Peng, Zhixing Yang, and Fang Yang
Subjects: SIMPLE (military communications protocol), Computer Networks and Communications, Estimation theory, business.industry, Computer science, Orthogonal frequency-division multiplexing, Synchronization, Transmit diversity, Noise, Time domain, Electrical and Electronic Engineering, Telecommunications, business, Algorithm, Software, Computer Science::Information Theory, Communication channel
Abstract: A simple transmit diversity scheme based on cyclic-shift pseudo noise (PN) sequences for the time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) system is proposed and the corresponding channel estimation algorithms are also investigated. Simulation results are presented to verify the effectiveness of the proposed method.
Published: 2008
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236. Improving physical-layer security using APSK constellations with finite-alphabet inputs

Author: Zhixing Yang, Zhaocheng Wang, and Ruifeng Ma
Subjects: Quadrature modulation, Minimum mean square error, Computer science, business.industry, Data_CODINGANDINFORMATIONTHEORY, Amplitude-shift keying, QAM, Amplitude, Secure communication, Telecommunications, business, Algorithm, Amplitude and phase-shift keying, Quadrature amplitude modulation, Phase-shift keying
Abstract: Physical-layer security could efficiently prevent wiretapping for wireless communication from the information-theoretic perspective. However, most related works in this area are based on the assumption of Gaussian inputs, which are impractical for a practical communication system. In this paper, we study the physical-layer security with finite-alphabet inputs, wherein amplitude phase shift keying (APSK) constellation is considered to improve the achievable secrecy rate performance. It is concluded that the secrecy rate can be improved by using APSK, comparing to its quadrature amplitude modulation (QAM) counterpart, which is verified by both the minimum mean square error (MMSE) theoretic derivation and simulation results. A specific strategy of selecting constellation orders for secure communication is also presented.
Published: 2013
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237. A new look of doping technique in BICM-ID

Author: Changyong Pan, Tao Cheng, Zaishuang Liu, Kewu Peng, and Zhixing Yang
Subjects: Theoretical computer science, Error floor, Computer science, Convolutional code, Concatenated error correction code, Concatenation, Doping, Code (cryptography), Data_CODINGANDINFORMATIONTHEORY, Serial concatenated convolutional codes, Sequential decoding, Algorithm, Decoding methods
Abstract: Doping technique was employed to remove the high error floor in conventional bit-interleaved coded modulation with iterative demapping and decoding (BICM-ID). This paper proposes a new look of the doping technique-BICM-ID with serial concatenated convolutional code (SCCC-BICM-ID). Unlike conventional doping decoding scheme which deems the doping decoder and the demapper as a whole doped demapper, we combine the doping code and the outer convolutional code together to form an SCCC, so that iterative demapping and decoding is performed between the demapper and the SCCC decoder. Extrinsic information transfer (EXIT) chart is used to analyze these two decoding schemes and reveals that they both can achieve near-capacity performance with no penalty of error floor. According to the results of EXIT analysis and BER simulations, SCCC-BICM-ID system can achieve the same or even better performance compared to the doping BICM-ID system with lower decoding complexity.
Published: 2013
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238. QoS-guaranteed resource allocation supporting multi-services in OFDM systems

Author: Zhixing Yang, Zhaocheng Wang, Fang Wang, and Yong Li
Subjects: business.industry, Orthogonal frequency-division multiplexing, Computer science, Broadband networks, Air interface, Quality of service, Distributed computing, Genetic algorithm, sort, Link adaptation, business, Greedy algorithm, Computer network
Abstract: Orthogonal frequency division multiplexing (OFDM) is a promising technique for the broadband air interface and has been widely deployed in current wireless transmission systems. With the adoption of adaptive modulation and coding, OFDM system can support multi-services dissemination. However, since different services have different quality of service (QoS) requirements, efficient resource allocation while satisfying various QoS requirements remains a challenge in OFDM systems, especially when the resource is relatively small compared with the great demand of services. In this paper, we study the problem of how to allocate the resource for QoS-constrained multiple services in OFDM systems over time-frequency dimensions. We investigate two algorithms to sort an optimal service queue for resource allocation. One is greedy algorithm with low complexity, and the other one is genetic algorithm which is closer to the optimal solution. Simulation results demonstrate that genetic algorithm performs better than greedy algorithm but with longer computational time.
Published: 2013
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239. Efficient mobile content dissemination through broadcast and opportunistic networks

Author: Yong Li, Depeng Jin, Zhixing Yang, Zhaocheng Wang, and Fang Wang
Subjects: Broadcasting (networking), Transmission (telecommunications), business.industry, Computer science, Mobile content, business, Broadcast radiation, Markov model, Computer network
Abstract: Wireless traffic has two features: people have common interests in the hottest contents, and a large amount of traffic belongs to non-realtime services. Exploiting these two features, we propose a content dissemination system, integrating broadcast network and opportunistic network. In the proposed system, popular contents are broadcasted through broadcast network and then disseminated to users through opportunistic network. Such system can significantly reduces the same contents repeated transmission and efficiently delivers contents to their clients. Using a Markov model, we theoretically analyze content dissemination delay of the proposed system.
Published: 2012
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240. Improve the performance of LTE Turbo coded modulation by irregular mapping

Author: Zhixing Yang, Kewu Peng, Zaishuang Liu, and Tao Cheng
Subjects: Block Error Rate, Channel code, Signal-to-noise ratio, Modulation, Computer science, Real-time computing, Turbo code, Data_CODINGANDINFORMATIONTHEORY, Algorithm, Decoding methods, Term (time), Communication channel
Abstract: 3GPP long term evolution (LTE) Turbo coded modulation is well-known for its excellent error-control capability. However, its decoding threshold is still a few decibels away from the constellation-constrained capacity. In this paper, an irregular mapping scheme involving labeling search is proposed to improve the performance of the LTE system. The scheme first predetermines one labeling, and then searches the other one via adaptive binary switch algorithm (ABSA), which considerably increases the design freedom and can provide near-optimal match to a given channel code. By applying the scheme to the LTE specification (Release 8), a practical bit-interleaved Turbo coded modulation with iterative demapping and decoding (Turbo-BICM-ID) system is proposed. With a slight modification on the constellation mapping, the scheme can lower the signal-to-noise ratio (SNR) threshold by 0.43∼0.48dB at the block error rate (BLER) of 10−2 under different channel conditions.
Published: 2012
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241. Labeling classification for 3D-BPSK and its application in powerline communications

Author: Zhixing Yang, Kewu Peng, Yirong Wang, Congyan Liao, and Tao Cheng
Subjects: Information transfer, symbols.namesake, Additive white Gaussian noise, Narrowband, Modulation, Electronic engineering, symbols, Curve fitting, Decoding methods, Communication channel, Phase-shift keying, Mathematics
Abstract: Powerline communications (PLC) have gained heightened interest in recent years. PLC G3, a newly developed specification for narrowband PLC, uses DBPSK/DQPSK as its modulation to provide a data rate up to 33.4kbps. In this paper, we propose to use 3D-BPSK in PLC G3 to lower the signal-to-noise ratio (SNR) threshold of the system with iterative demapping and decoding (ID). To optimize the performance of ID systems, 3D-BPSK labelings are classified into 33 groups based on the criteria of constellation mapping operators and Hamming-Euclidean distance (HED) spectrum. The optimal labeling is selected through exhaustive searching over the 33 groups by means of curve fitting on extrinsic information transfer (EXIT) chart. Simulation results show that the proposed system can achieve up to 1.0 dB iterative gain under AWGN channel.
Published: 2012
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242. Near-capacity BICM-ID for MIMO channels

Author: Jian Song, Fang Yang, Qiuliang Xie, and Zhixing Yang
Subjects: Space–time block code, Block code, 3G MIMO, Iterative method, Computer science, Control theory, Concatenated error correction code, MIMO, Data_CODINGANDINFORMATIONTHEORY, Algorithm, Multi-user MIMO, Communication channel
Abstract: Bit-interleaved coded modulation with iterative demapping (BICM-ID) is investigated for multiple-input multiple-output (MIMO) channels. Based on the average mutual information (AMI) analysis, vertical Bell-lab layered space-time (V-BLAST) rather than space-time block code (STBC) is chosen to be combined with BICM-ID. Based on the extrinsic information transfer (EXIT) chart analysis, a novel algorithm in searching for a labeling to well match the outer code is proposed for MIMO channels, which facilitates a near-capacity V-BLAST-BICM-ID scheme. Computer simulation confirmed the near-capacity performance.
Published: 2011
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243. The Research and Simulation of Synchronization Algorithms of GBPS Parallel Digital Receiver

Author: Zhixing Yang, Rui Zhang, Zhigang Li, and Changyong Pan
Subjects: Computer science, business.industry, Parallel computing, Synchronization algorithm, business, Computer hardware
Published: 2011
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244. A new joint source and channel coding scheme for packet-based scalable multimedia streams

Author: Chen Chi, Yu Zhang, Yaosheng Fu, and Zhixing Yang
Subjects: Channel code, Joint source and channel coding, Network packet, Computer science, Real-time computing, Variable-length code, Data_CODINGANDINFORMATIONTHEORY, Coding tree unit, Scalable Video Coding, Distortion, Redundancy (engineering), Forward error correction, Algorithm, Communication channel
Abstract: In this paper, we develop a new technique for partitioning of source and channel coding bits for packet-based scalable streams and a general unequal error protection channel coding scheme. Unlike the previous algorithms, we regard coded source streams as a collection of different subsets with different importance and adaptively select some of them to transmit with optimal channel coding subject to channel status. Both packets extraction strategy and forward error correction coding(FEC) assignment are considered in the joint source channel coding problem. We propose a double hill climbing method and two simplified algorithms to solve the mixed optimization problem. To validate the algorithms, we exploit the scalability of H.264 scalable video coding (SVC) and derive a simple yet accurate loss distortion model for simulation. The results show that the new algorithms with extraction strategy result in less expected distortion than others with all source packets transmitted. It is also shown that the simplified algorithms with very low complexity are also appealing and can achieve near-optimal performance.
Published: 2010
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245. Review of Key Techniques for Future DTTB Systems

Author: Zhixing Yang, Zhaocheng Wang, Kewu Peng, Chao Zhang, Jun Wang, Jintao Wang, and Fang Yang
Subjects: Multimedia, business.industry, Computer science, Frame (networking), Internet television, Digital radio, Broadcasting, computer.software_genre, Preamble, law.invention, Terrestrial television, law, Digital broadcasting, Digital television, business, Telecommunications, computer
Abstract: This paper illustrates some key features for future Chinese digital television terrestrial broadcasting (DTTB) systems including newly proposed frame structure, preamble design, multi-service support, transmit diversity, time-frequency positioning and etc.
Published: 2010
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246. Capacity Study of Virtual MIMO Uplink OFDMA Cellular System with Cochannel Interference

Author: Zhaocheng Wang, Zhixing Yang, and Dazhi Piao
Subjects: 3G MIMO, Frequency-division multiple access, Orthogonal frequency-division multiplexing, Computer science, Orthogonal frequency-division multiple access, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, MIMO, Data_CODINGANDINFORMATIONTHEORY, Transmitter power output, Interference (wave propagation), Multi-user MIMO, Frequency reuse, Frequency allocation, Single antenna interference cancellation, Telecommunications link, Computer Science::Networking and Internet Architecture, Cellular network, Electronic engineering, Path loss, Computer Science::Information Theory
Abstract: Cochannel interference has been the bottleneck to the capacity of cellular network. To solve this issue, a virtual multiple-input multiple-output (MIMO) system can be constructed for the uplink OFDMA cellular system. However, if multiple cochannel MIMO clusters are used, they will still interfere with each other. Capacity of this virtual MIMO system in cellular networks with cochannel interference is derived and simulated. The influence of some parameters to the system capacity are studied, including path loss component, transmit power, the radius of cell and the number of antennas in base stations. Simulation results show that if only the first 1 neighbor layer of cochannel cells are considered, the virtual MIMO capacity will be greatly larger than that of the single-input single-output (SISO) system with universal frequency reuse. However, the cochannel interference can greatly reduce the virtual MIMO capacity in the uplink cellular system compared with the interference free environment. Thus interference cancellation techniques are required to be developed in the future.
Published: 2010
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247. A Modified Loop Filter Design for Digital Symbol Synchronizer

Author: Yu Zhang, Zhixing Yang, and Siliang Zhuang
Subjects: Adder, Synchronizer, Moving average, Computer science, Control theory, Matched filter, Multiplier (economics), Detection theory, Transfer function, Synchronization, Jitter
Abstract: A modified loop filter structure for symbol synchronizer with reduced timing jitter is proposed. A moving average unit (MAU) is added to the traditional proportional-integral (PI) structure to form the modified loop filter. Since the variance of the noise is limited under the average operation, timing jitter is reduced efficiently. Furthermore, the structure is easy for implementation, which requires only one more multiplier, several adders and registers compared to the traditional structure.
Published: 2010
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248. Technical Review for Chinese Future DTTB System

Author: Zhaocheng Wang, Zhixing Yang, Fang Yang, Kewu Peng, Jintao Wang, Jian Song, and Jun Wang
Subjects: Digital television terrestrial broadcasting, Transmit diversity, Modulation, business.industry, Computer science, Digital Video Broadcasting, Frame (networking), Fading, Digital television, Broadcasting, Telecommunications, business, Return channel
Abstract: This paper summarizes some key features for future Chinese digital television terrestrial broadcasting (DTTB) systems including improved frame structure, transmit diversity, advanced channel coding and modulation, multi-service support, broadcasting return channel solution and etc.
Published: 2010
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249. Improved DFT-based channel estimation for OFDM systems over multipath channels

Author: Jian Song, Zhaocheng Wang, Xiaoqing Wang, Jintao Wang, and Zhixing Yang
Subjects: Multipath channels, Orthogonal frequency-division multiplexing, Computer science, Statistics, Algorithm, Noise (electronics), Discrete Fourier transform, Computer Science::Information Theory, Communication channel
Abstract: To efficiently suppress the noise through a time-domain threshold value after the least square (LS) estimation, the discrete Fourier transform (DFT) based channel estimation (CE) is usually carried out in practical orthogonal frequency division multiplexing (OFDM) systems for its inherent noise immunity. In this paper, an improved DFT based CE method for OFDM systems is proposed. Taking advantage of the wavelet decomposition, the proposed method obtains an optimal threshold value according to the minimum mean-square error (MMSE) optimality criterion. Both theoretical analysis and computer simulation show that, the proposed method not only reduces the mean-square error (MSE) without MSE floor compared with the conventional methods, but also improves the symbol error rate (SER) performance by being more close to that of the ideal known-channel case over both static and dynamic multipath channels.
Published: 2010
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250. Uplink OFDMA Channel Estimation with Frequency Domain Compensation in Sparse Channel

Author: Jun Wang, Guanping Lu, Zhaocheng Wang, Chao Zhang, and Zhixing Yang
Subjects: Frequency response, Orthogonal frequency-division multiplexing, Computer science, Frequency domain, Channel impulse response, Telecommunications link, Electronic engineering, Data_CODINGANDINFORMATIONTHEORY, Time domain, Transient response, Leakage (electronics)
Abstract: In orthogonal frequency division multiplexing (OFDM) systems, the estimated channel impulse response (CIR) can be recovered by transforming the initial channel frequency response (CFR) to time domain. The CIR is preferred to be filtered before transforming to frequency domain and using as accurate CFR. In orthogonal frequency division multiplexing access (OFDMA) systems, subcarriers are allocated to different users to transmit data. Every user uses part of the whole OFDM subcarriers. If we still use the conventional transform domain scheme, the frequency leakage will be significant. To solve the leakage, we proposes a new scheme named as time domain filter and frequency domain compensation (TFFC) scheme. In this scheme, the filtered CFR vector is compensated in frequency domain. Simulation shows that this scheme improves the channel estimation significantly.
Published: 2010
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