时频重叠复用系统的低复杂度序列检测算法  

Low complexity sequence detection algorithm for time-frequency overlapped multiplexing system

作　　者：莫勇[1] 王竞[1] 刘栋[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：《北京航空航天大学学报》2009年第1期5-8,共4页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金资助项目(90604035)

摘　　要：利用时频重叠信号(Overlapped Hybrid-Division Multiplexing,OVHDM)实现高频谱效率数据传输,性能优于多电平调制方案.介绍了OVHDM信号模型以及最佳检测算法.为了降低检测的复杂度,提出了联合软干扰消除的序列检测算法——SIC-SE:软干扰消除后的各子载波数据流,在序列检测前首先通过基于快速矩阵逆的有限冲激响应滤波器.该算法的检测复杂度远低于最大似然检测算法,性能优于传统的软干扰消除算法.仿真表明,基于该检测算法的编码OVHDM系统性能优于使用相同信道编码的QAM-OFDM系统.Overlapped hybrid-divlsion multiplexing（OVHDM） can achieve high spectrum efficiency, and the performance is superior to multi-level modulation. The system model and the optimum detection were studied. The joint soft interference cancellation and sequence estimation algorithm, SIC-SE, was proposed to reduce the detection complexity. The sub carrier data stream of OVHDM signals was first separated by soft interference cancellation, then filtered by finite impulse response （FIR） filter based on fast matrix inversion, and finally detected with sequence estimation. The complexity of proposed algorithm is much lower than maximum likelihood （ML） detection, while the performance is better than conventional SIC algorithm. Simulation results show that the performance of coded OVHDM system is better than the same coded QAM-OFDM system.

关 键 词：信号检测 重叠复用 最大似然 迭代方法 

分 类 号：TN929.53[电子电信—通信与信息系统]