基于QR分解的信号检测算法的研究

Research of QR Factorization Based Signal Detection Algorithms

研究了VBLAST-OFDM系统基于QR分解的几种信号检测算法,分析了各种算法优缺点,指出信号检测顺序是降低误码率的关键,针对VBLAST算法计算量大的缺点,建议采用SQRD算法,该算法利用迭代运算代替矩阵求逆运算,降低了VBLAST算法的计算量,并采用MMSE准则对该算法进行进一步推广,仿真结果表明采用MMSE-SQRD算法优于除ML(最大似然)算法以外的检测算法。

Study is made on a few QR factorization based signal detection algorithms for VBLAST-OFDM systems. With the analysis of the pros and cons of these algorithms. It tells that the signal detection order is the key reduce the BER. It is recommended to emplay SQRD algorithm to overcome the disadvantage of high computation overhead of VBLAST algorithm. The overhead is decreased with the matrix inverse computation replaced by iteration operation. Further extension is achieved by use of MMSE criterion. Simulation results show performance of MMSE-SQRD is superior to all other algorithms except ML algorithm.