一种新型的针对频率选择性MIMO信道的空时分层检测算法

New detection algorithm for layered space-time receiver in frequency selective fading MIMO channels

在FS BLAST算法的基础上 ,提出了一种改进的适用于频率选择性多输入多输出(MIMO)信道的接收方案 ,该方案采用部分最大似然分层检测 ,其主要思想是在空时分层检测的基础上 ,部分地引入最大似然 (ML)检测 ,从而有效地克服FS BLAST类算法由于误差扩散所导致的系统性能下降的缺点 .该方法的特点是仅对接收信号的一部分使用最大似然检测 ,因此 ,计算量并没有太大的增加 .另外 ,该方法可以自由地选取进行最大似然检测的信号维数 ,因此可根据实际系统特点在计算复杂度和误码率性能间选取最优折衷 .

Using partly maximum-likelihood (ML) layered receiver, an improved algorithm is given in frequency selective fading multiple input and multiple output (MIMO) channels. The main idea of the algorithm is to use ML detection algorithm partly in layered space-time architecture, therefore the shortcoming of an FS-BLAST system, degradation of system performance due to the error propagation, can be overcome. Since the new algorithm only uses ML detection partly, it can still maintain low implementation complexity. In addition, because the dimension of the signals detected by ML criterion can be chosen freely, it is achievable to find a tradeoff between implementation complexity and system performance.