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针对太赫兹频段高速移动场景，提出了一种参考信号方案——增强型离散傅里叶变换扩展正交频分复用（E DFT-s-OFDM）DMRS：将具有循环前缀（CP）和循环后缀（CS）的参考信号序列分割为首部和尾部参考信号序列，然后分别嵌入每个OFDM符号的尾部和首部。这种方案的优点在于，前一个OFDM符号的尾部和后一个OFDM符号的首部构成一个完整的参考信号序列，从而允许接收端在每个OFDM符号间隔内都能进行信道估计，提高了信道估计的精度和实时性。此外，相邻OFDM符号的首部和尾部参考信号序列相同，从而省去了每个OFDM符号的传统循环前缀（CP），提高了频谱效率。仿真结果表明，在太赫兹频段高速移动场景下，与5G NR DFT-s-OFDM波形的DMRS方案相比，该方案的信道估计更精确，通信系统的频谱效率更高。

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In order to optimize the energy efficiency and spectral efficiency of decoded-and-forwarded full-duplex relay network in imperfect channel state information, this paper proposed an energy efficiency and spectral efficiency balancing strategy based on this network model. It could replace the non-convex multi-objective optimization problem to a convex single-objective optimization problem by constructing a compromise optimization function of energy efficiency and spectral efficiency. It used derivation method and Lagrange multiplier method to solve the optimal relay transmission power under different compromise factors. The simulation results show that changing the compromise factor can change the energy efficiency and spectral effectiveness of the system and obtain the performance tradeoff of energy efficiency and spectrum effectiveness. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Chongqing University of Posts & Telecommunications (Natural Science Edition) is the property of Chongqing University of Posts & Telecommunications and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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To improve the spectral efficiency and bit error ratio performance in the millimeter wave massive multiple input multiple output (MIMO) systems, a hybrid precoding optimization algorithm was proposed based on joint sparsity. According to the sparseness property of the millimeter wave channel in the angular domain, the lobe channel was reconstructed, and the hybrid precoding design was divided into multiple sub-problems for each lobe subchannel. To solve the sparse reconstruction problem with nonconvex constraints, the implicit sparse structure of digital precoding matrix was used to design the self-support set and common support set of analog precoding matrix for each data stream. Based on the correlation between analog precoding matrix and digital precoding matrix, the analog precoder and the digital precoder were jointly optimized. The computation complexity analysis and simulation analysis were completed. The results show that compared with the OMP algorithm, the proposed algorithm exhibits remarkable 91% or 93% reduction in computational complexity with enhancing spectral efficiency and bit error ratio performance when compared to the SLD algorithm. [ABSTRACT FROM AUTHOR]

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针对无线光通信（WOC）技术高频谱效率以及低误码率的需求，文章提出了一种脉冲幅度调制（PAM）与脉冲位置调制（PPM）联合的调制方法，在传统调制技术的基础上充分利用无线通信带宽资源提高了传输速率。系统采用空域映射（SM）方式将不同幅度脉冲映射至特定激光器，并通过映射关系完成多链路分层传输。与传统单调制方式相比，联合调制技术通过编码机制的协调配合，利用脉冲的幅度以及所在时隙位置的变化来传递信息。实验测试证明，采用联合调制分层传输技术，通过同时发送和检测每个数据脉冲的时隙位置及幅度信息，不仅提升了系统频谱效率和传输速率，误码性能也得到了有效改善，实验结果为后续应用研究提供了一种新的技术途径。

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Copyright of Journal of Data Acquisition & Processing / Shu Ju Cai Ji Yu Chu Li is the property of Editorial Department of Journal of Nanjing University of Aeronautics & Astronautics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

针对可见光通信系统传输性能问题，文章提出了一种无载波幅度相位（CAP）调制与数字脉冲间隔调制（DPIM）结合的混合调制方案。该方案分别利用两者频谱效率和功率效率较高的特点，发送端在脉冲间隔调制的脉冲时隙加载直流偏置光CAP（DCO-CAP）信号，实现混合调制信号的并行生成，接收端通过门限检测和最大似然检测完成混合调制信号的串行解调。推导了室内可见光高斯信道下混合调制方案的误码率（BER）及误帧率（FER）解析表达式。此外，从频谱效率和FER两方面对比分析了该混合调制方案与传统DPIM及DCO-CAP方案的性能优劣。数值仿真结果表明：当频谱效率相同时，混合调制方案较单一调制有更高的可靠性。

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In the large-scale MU-MISO system, this paper studied the spectral efficiency affected by the channel and power allocation in spatially correlated channels. Firstly, it derived the transmit correlation matrix of the user from steering matrix which was determined by the wave path difference of the transmission signal. Then it established spatial correlation channel under the large-scale shadow fading and the scattering environment with Gaussian distribution. Based on the spatial correlation channel, it simulated the precoding which could reduce the interference between multiple users for the spectral efficiency performance. Finally, this paper proposed a power allocation algorithm that made the spectrum efficiency maximized in the scenario where the transmit power was limited and signal to interference plus noise ratio of each user was limited in receive signal. The simulation shows that the spectral efficiency of RZF precoding in spatially correlated channels is better than that of MRT precoding. And compared with the average power allocation, the spectral efficiency with the proposed algorithm which has strong theoretical and practical significance has the improvement. [ABSTRACT FROM AUTHOR]

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This paper investigated the system performance of decode-and-forward relay cooperative system under Rayleigh channel and Nakagami-m channel. Combing with the average data packet error rate, it deduced formulas for end-to-end spectrum efficiency expression and the stability of system in double relays system based on source-relay modulation levels. Mean-while, it analyzed the effects of different channel parameters m on link spectrum efficiency and system stability, then deduced the higher order variables of formulas for spectrum efficiency and stability of system under multiple relays system. Numerical results show that the proposed formulas have better performance than some of the traditional adaptive algorithm. [ABSTRACT FROM AUTHOR]

基于FTN（超Nyquist）方案是一种高频谱效率传输方案。文章总结了目前国际上最新的基于FTN传输方案:级联多模盲均衡FTN、数字FTN和SOFTN（软输出FTN）。其中,级联多模盲均衡FTN方案能有效地抑制噪声和信道间串扰,数字FTN方案能有效地简化系统结构,而SOFTN方案的频谱效率最高。对这三种方案的性能和原理进行了详细分析和比较,以期作为未来长距离、大容量光纤通信系统设计的依据。

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针对光纤通信领域技术热点Tbit/s高速光传输开展研究,分析了其关键的信道内复用技术。基于频谱效率、性能和可实现性,在对Nyquist波分复用、正交频分复用和Super-Nyquist三种技术进行比较后给出了对信道内复用技术的具体选择,并提出具有指导意义的Tbit/s高速光传输商用技术解决方案。

针对400Gbit/s传输性能及应用问题,仿真分析了400Gbit/s不同技术方案的传输距离与频谱效率、入纤功率限制与非线性效应,结果表明,4×100Gbit/s技术可以满足骨干网1 000km以上的传输需求,而2×200Gbit/s技术则必须结合低损耗或超低损耗光纤以及新型低噪声光放大器等才可能实现。城域网、数据中心等的大带宽互联可能率先采用400Gbit/s技术,而2×200或4×100Gbit/s可以满足传输容量和传输距离的一般需求。

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通常链路自适应技术均是基于分层的思想来设计的,往往使得局部性能最优化,但系统的整体性能却未达到最优。文章在LTE（长期演进）网络架构基础上,针对物理层的AMC（自适应调制编码）和MAC（介质访问控制）层的HARQ（混合自动请求重传）两种自适应技术提出一种跨层设计方案。分析了跨层耦合参数与系统性能之间的关系,并给出了详细的推导过程和具体的表达式。然后给出了平均时延和平均误包率约束条件下的跨层优化问题。仿真结果表明,该跨层设计能进一步提高系统的平均频谱效率;在给定业务QoS（服务质量）需求下,可以根据信道质量来选择最佳的最大重传次数和AMC方式,使得系统的平均频谱效率最大化。

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Copyright of Telecommunication Engineering is the property of Telecommunication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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文章设计了一个基于频率间插复用的DWDM-ROF（密集波分复用-光载无线）系统,使每个信道载波与边带之间的空闲频段得到利用,从而提高了DWDM-ROF系统的频谱利用率。同时,为该系统设计了一种基于FBG（光纤布拉格光栅）的新颖的解复用器。数据传输的仿真实验不仅验证了该方法的可行性,还显示出了该系统具有良好的抗信道串扰能力。