时频二维重叠复用系统  

Overlapping Multiplexing in Both Time and Frequency Domain

作　　者：王竞[1] 李道本[1] 

机构地区：[1]北京邮电大学信息工程学院,北京100876

出　　处：《电子与信息学报》2008年第5期1176-1179,共4页Journal of Electronics & Information Technology

基　　金：国家自然科学基金重点项目(90604035)资助课题

摘　　要：基于时域重叠复用和频域重叠复用的思想,该文提出了时频二维重叠复用系统——OvHDM系统。研究了OvHDM系统的最佳检测、频谱效率、复杂度、性能以及峰均比。OvHDM系统模型是向量卷积编码约束模型。为了检测OvHDM信号,提出了向量空间上的最大似然序列检测算法,MU-MLSD。计算机仿真证明:频谱效率为6bit/(s?Hz)时,OvHDM较64QAM具有4.5dB的功率增益,较OvTDM也有1.5dB的功率增益;同时,OvHDM的峰均比较128个子载波的OFDM有2dB的增益,较1024个子载波的OFDM有2.6dB的增益。In the paper, a novel overlapping multiplexing technology named OvHDM （Overlapped Hybrid Division Multiplexing） is proposed. In OvHDM, the overlapping multiplexing is developed in both time and frequency domain. The optimum detection, spectrum efficiency, detection complexity, performance and Peak-to-Average Power Ratio （PAPR） of OvHDM are studied in detail. The signal model of OvHDM is the convolutional constraint model between vectors. In order to implement optimum detection, a novel algorithm named MU-MLSD （Multi-User Maximum-Likelihood Sequence Detection） is proposed. The simulation results prove that the performance of OvHDM is better 4.5dB than that of 64QAM and better 1.5dB than that of OvTDM （Overlapped Time Division Multiplexing） when the spectrum efficiency is 6bit/s/Hz. Meanwhile, the PAPR of OvHDM is better 2dB than that of 128-subcarrier OFDM and better 2.6dB than that of 1024-subcarrier OFDM.

关 键 词：时频二维重叠复用 时域重叠复用 频域重叠复用 多用户序列检测 

分 类 号：TN929.5[电子电信—通信与信息系统]