垂直分层空时码的迭代检测算法

Iterative Detection Algorithm for V-BLAST

为解决垂直分层空时码的最优最大似然(ML)检测难以实现,而常用检测算法的性能受到错误传播影响的问题,提出了一种垂直分层空时码的迭代检测(ID)算法.该算法利用多天线接收信号的软信息进行迭代并行消除干扰,有效地降低了错误传播的影响.仿真结果表明,ID算法的收敛速度快,其检测性能比常用的ZF-DFE算法有明显的提高;在低信噪比区域,ID算法的检测性能与ML算法相当.

The optimal maximum likelihood （ML） detection of vertical-bell laboratory layered space-time codes （V-BLAST） is difficult to implement and the performances of conventional detection algorithms are limited by error propagation. In order to solve these problems, an iterative detection （ID） method for V-BLAST codes is proposed, in which the soft information of the signals received by multiple antennas is iterated to eliminate the interference. By the proposed method, the effect caused by the error propagation is efficaciously mitigated. Simulated results in- dicate that the ID method is of quicker convergence speed and better detection performance, as compared with the conventional ZF-DFE algorithm. Moreover, it is of a detection performance similar to the ML method in low SNR （Signal Noise Ratio） region.