分层空时码检测算法的研究

分层空时码技术是提高无线信道传输速率的一种十分有效的方法.迫零检测算法和最小均方误差检测算法是分层空时码体制中经常使用的两种检测算法,它们都使用了通常的线性合并置零技术,因此要求接收天线数不小于发射天线数,即要求在接收机上安装较多的天线,从而限制了分层空时码在移动环境下的应用.本文引入分层空时码的最大似然检测算法,突破了前两种算法对接收天线数的限制,并分别针对单路径和多径衰落信道环境,对分层空时码的三种检测算法的性能进行了仿真比较和分析,从而提出了它们各自适合的应用环境.

The Research on the Detection Algorithms for Layered Space-time Codes

Layered space-time (LST) architecture is effective in achieving high data rate in wireless communication.Zero-Forcing (ZF) and Minimum Mean-Squared Error (MMSE) algorithms are two common detection algorithms for LST codes.However,both ZF and MMSE require the number of receive antennas to be no less than that of transmit antennas,thus greatly limits the application of LST codes in mobile communication.In this paper we introduce Maximum Likelihood (ML) detection algorithm for LST codes,which has no limit on the number of antennas,and compare the performance of the three detection algorithms for layered space-time codes over flat fading and Rayleigh fading channel.Their applicability is then pointed out respectively.