短波单载波空时分组码的频域均衡研究

短波通信受多径衰落、干扰复杂等影响严重。空时分组码(Space Time Block Code,STBC)技术在无需增加频谱资源和天线发射功率的前提下,可以利用多输入多输出(Multiple-Input Multiple-Output,MIMO)信道提供的分集增益提升传输可靠性。分析短波MIMO研究现状,提出短波单载波STBC频域均衡(Frequency-Domain Equalization,FDE)系统架构,针对短波信道引入的码间干扰研究MIMO MMSE-FDE均衡技术,并将单载波STBC频域均衡与时域均衡及短波现有波形进行仿真对比。仿真结果表明,相较于短波现有波形,单载波STBC频域均衡系统的可靠性有较大幅度提升,且性能与STBC时域均衡接近,但计算复杂度远低于STBC时域均衡。

Frequency-Domain Equalization for Single-Carrier STBC in HF Communication

HF(High-Frequency)communications are severely affected by multipath fading and complex interference.STBC(Space Time Block Code)technology can increase the transmission reliability by using the diversity gain provided byMIMO(multiple-input multiple-output)channel without increasing the spectrum resources and antenna transmit power.This paper analyzes the research status of HF MIMO,presents the system architecture of HF single-carrier STBC frequency-domain equalization,and discusses MIMO MMSE-FDE for eliminating the ISI resulted by HF channel,and compares it with STBC timedomain DFE and traditional HF waveformvia simulation.Simulation results indicate that compared with HF current waveform,the reliability of the single-carrier STBC frequency-domain equalization system is greatly improved,and the performance is close to that of STBC time-domain equalization,but the computational complexity is much lower than STBC time-domain equalization.