V-BLAST系统检测算法

Research on the detection algorithms of V-BLAST receiver

目的为了降低垂直分层空时码（V-BLAST）系统的复杂度，提高系统性能。方法介绍了V—BLAST的干扰抵消、并行解码、QR分解算法，提出了两种改进的检测算法，利用MATLAB对它们在复杂度和性能方面进行仿真与分析。结果仿真显示干扰同时抵消算法在信噪比为10dB时误码率为10-2，性能最优，在译码时对初始估值进行排序，增加了译码复杂度；并行解码算法和QR算法的复杂度较小，但误码性能降低。结论要求性能高的选用干扰抵消算法，要求复杂度低的选用并行解码或QR算法，性能和复杂度兼顾则选用循环迭代QR算法。

Aim In order to reduce the complexity of Vertical Bell Laboratories Layered Space-Time （V-BLAST） and improve its performance. Methods Introduce the algorithms of V-BLAST, including Zero Forcing-Ordered Successive Interference Cancellation （ZF-OSIC）, QR, Parallel Interface Cancellation （PIC）. And two developed algorithms are put forward. The complexity and performance are analyzed with MATLAB. Results The simulation results show that performance of interference cancellation algorithm is best when the SNR is 10 dB with the BER of 10 - 2, the decoding complexity is increased when the initial value is sort, the complexity of parallel decoding algo-rithm and the QR algorithm is less than the cancellation algorithm, while the BER performance is decreased. Conclusion Interference cancellation algorithm can be selected with high-performance; Parallel decoding algorithm or QR algorithm can be selected with low complexity, the iterative QR algorithm can be selected with both high-performance and low complexity.