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215 results on '"Kaizhi Huang"'

201. BER performance of 2-D-RAKE receivers with power control error in Nakagami fading channels

Author

Kaizhi Huang, Guoan Chen, Youzheng Wang, and Jing Wang

Subjects
Code division multiple access, Computer science, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Rake, Data_CODINGANDINFORMATIONTHEORY, Computer Science::Performance, Fading distribution, Computer Science::Networking and Internet Architecture, Bit error rate, Electronic engineering, Fading, Performance improvement, Multipath propagation, Computer Science::Information Theory, Power control
Abstract

It is well known that power control is critical in CDMA mobile systems and the power control error (PCE) exists in spite of power control methods being used. In this paper, the closed-form expressions of signal-to-interference-plus-noise ratio (SINR) and the average bit error rate (BER) are derived for a two-dimensional (2-D)-RAKE receiver with imperfect power control in a frequency-selective Nakagami fading channel.. The combined impact of PCE, multipath Nakagami fading, spatial and temporal diversity order, and multiple-access interference on the system performance has been analyzed for all kinds of fading environments. The simulation results indicate that the BER performance degrade due to PCE. But increasing spatial and temporal diversity order can possibly compensate for the performance loss when PCE is not very serious. The exact performance improvement due to space-time processing varies with the PCE and the fading environment.

Published
2003

202. Smart antenna and spatial diversity-combining

Author

Jing Wang, Kaizhi Huang, Guoan Chen, and Youzheng Wang

Subjects
Mobile radio, Signal processing, Computer science, Code division multiple access, Smart antenna, Radio receiver, Antenna diversity, law.invention, Spread spectrum, Radio propagation, Transmission (telecommunications), law, Electronic engineering, Communication channel
Abstract

The smart antenna and spatial diversity-combining receiver are two of the most important spatial signal processing technologies. This paper studies the radio propagation characteristics of the transmission path, spatio-temporal channel model and channel characteristics in different environments. On the basis of those analyses, the authors analyzed the operating principle of the smart antenna and spatial diversity-combining technology, and especially showed the differences between these two technologies in several aspects.

Published
2003

203. Performance analysis of coherent 2D-RAKE receiver for WCDMA in Nakagami multipath fading

Author

Jing Wang and Kaizhi Huang

Subjects
Computer science, Code division multiple access, Radio receiver, Nakagami distribution, law.invention, Computer Science::Performance, Fading distribution, law, Computer Science::Networking and Internet Architecture, Electronic engineering, Bit error rate, Rake receiver, Maximal-ratio combining, Fading, Multipath propagation, Computer Science::Information Theory
Abstract

A simplified and approximated probability density function (PDF) has been obtained for the signal-to-interference-plus-noise ratio (SINR) of the maximal ratio combining (MRC) 2D-RAKE receiver in a frequency-selective Nakagami multipath fading with arbitrary fading parameters, thus simplifying the analysis of bit error rate (BER) and outage probability in the presence of multi-path interferers. The numerical results indicate that the 2D-RAKE receiver could improve the system performance of WCDMA communication systems.

Published
2002

205. Study on physical layer security with game theory.

Author

Wanyang Xiao, Kaizhi Huang, Xingguo Luo, and Ying Hong

Abstract

In the research of physical layer security, it is sometimes needed to analyze the security of network nodes with dependency or adversary relationships, but there is hardly any efficient solution at present. This article analyzes the dependency or adversary situations and proposes that current physical layer security has rational nature and multi-objective optimization need in the new scenes, both of which are meanwhile the fundamental requirements of Game Theory. A new solution is formed by constructing a game description of physical layer security with Game Theory. [ABSTRACT FROM PUBLISHER]

Published
2013
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206. The eigenvalue decomposition method for wireless physical layer security.

Author

Hongwei Pang, Xueming Wang, Kaizhi Huang, and Jiang Ji

Abstract

For the wiretapping in wireless communication system, this paper proposes an eigenvalue decomposition method for wireless physical layer security. In the method, firstly, the channel state information matrix is decomposed into sub-channels by eigenvalue decomposition. Secondly, we choose the sub-channels with bigger eigenvalue to transmit useful signal and the one with the smallest eigenvalue is transformed into a random channel. Then, the received signal of legitimate receiver becomes steady, while eavesdropper's turns random. The simulations show that, by choosing the characteristic, the method can decrease the demands of legitimate channel state, and keep the eavesdropper's error probability at a high level, so as to increase the system security. We can get the conclusion that the eigenvalue decomposition method can prevent wiretapping and increase wireless physical layer security between the transmitter and legitimate receiver effectively. [ABSTRACT FROM PUBLISHER]

Published
2012
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210. High-rate secret key generation aided by multiple relays for Internet of things.

Author

Shuaifang Xiao, Yunfei Guo, Kaizhi Huang, and Liang Jin

Subjects
INTERNET of things, COMPUTER networks, CYBER physical systems, MACHINE-to-machine communications, WIRELESS communications
Abstract

A multiple relays aided secret key generation algorithm is proposed to improve the generated secret key rate for Internet of things when the wireless channels change slowly. First, the two legitimate users and relays send training sequences in turn to estimate the channels. Then, the relays employ secure network coding technique to help the two legitimate users exploit the randomness of relay channels. Finally, the two legitimate users agree on a secret key without the help of relays. In addition, the optimal relays selection with optimal power allocation algorithm is present to further improve the secret key rate when relay selection is needed. The performances of the proposed algorithms are verified by Monte Carlo simulation results. [ABSTRACT FROM AUTHOR]

Published
2017
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211. Security-oriented distributed access selection for D2D underlaying cellular networks.

Author

Xiaolei Kang, Xinsheng Ji, Kaizhi Huang, and Xiangyu Li

Subjects
MOBILE communication systems, INTERFERENCE (Telecommunication), TELECOMMUNICATION channels, COMPUTER simulation, PERFORMANCE evaluation
Abstract

In device-to-device (D2D) underlaying cellular networks, interference generated by D2D communications can be exploited to improve secrecy rate of cellular users (CUE). The security-oriented distributed access selection algorithm is proposed, in which each D2D pair decides whether to access to radio resources according to its local channel state information without considering the locations of D2D pairs and Eve. The ergodic secrecy rate of CUE and the data rate of D2D pairs in the proposed scheme are investigated. Simulation results show that the proposed scheme can achieve an impressive secrecy performance gain. [ABSTRACT FROM AUTHOR]

Published
2017
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212. High-resolution DOA estimation for cooperation networks using space-time hopping.

Author

Xiangyu Li, Suxia Guo, Liang Jin, Kaizhi Huang, and Lu Xia

Subjects
DIRECTION of arrival estimation, SPACE-time configurations, HOPPING conduction, ARRAY processing, BAYESIAN analysis
Abstract

Since the traditional direction-of-arrival (DOA) estimation algorithm is passive and non-cooperation, its performance degrades with respect to the large number of terminals and closely spaced sources in multinodes networks. A cooperated space-time hopping algorithm to estimate the DOA of all users simultaneously is presented. The signal will be adjusted by the pre-assigned hopping weights during each symbol time. The change of the weights is equivalent to the change of array manifolds, thus enriching differences between uses' channels. This algorithm is able to estimate more number of signals and separate some closely spaced sources. Simulations demonstrate the effectiveness of the algorithm. [ABSTRACT FROM AUTHOR]

Published
2016
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