改进的基于QR分解的分层空时检测算法

An Improved QR Based Detection Algorithm for Layered Space-Time Codes

该文提出一种应用于多输入多输出通信系统的基于QR分解的检测算法。该算法避免了传统分层空时检测算法中对信道矩阵求逆的过程,减小了运算复杂度。同时克服了排序QR分解检测复杂度高的问题。通过串行干扰抵消逐层去除最小错误概率的信号,减小了抵消过程中误差传播的概率,提高了系统的误码性能。仿真表明性能优于传统的分层空时检测算法以及排序、次优排序QR分解检测算法。对于未编码4发4收多天线系统,采用QPSK调制,在达到10?3误码率时,该文所提算法比分层空时检测算法有2.5dB的增益,比次优排序QR分解检测算法有5dB的增益。

An improved QR based detection algorithm is proposed for use in the Multiple-Input Multiple-Output（MIMO） communication systems.The method does not require the pseudo inverse of the channel matrix.The probability of error propagation is reduced through serial interference canceling;the minimum error probability signal is removed layer by layer.It has less computational complexity than ordered QR based detection and ordered BLAST detection.Simulation shows that it outperforms the classic BLAST and ordered,suboptimal ordered QR based detection algorithm.In the uncoded 4 × 4MIMO system with QPSK modulation,there proposed algorithm outperforms ZF-VBLAST by 2.5 dB and outperforms the sorted QR algorithm 5 dB at a BER of 10？3.