V-BLAST信号的宽线性反馈判决检测

Widely Linear Decision Feedback Detection for V-BLAST Signals

针对V-BLAST结构接收机采用传统反馈判决检测在高信噪比高端出现的检测性能不佳的问题,设计了一种具有更加检测性能的基于最小均方误差准则的宽线性反馈判决检测算法。计算机仿真结果显示,该算法采用最优子流检测顺序时,在信噪比的低端及高端,其误码率性能均逼近最大似然检测;当采用随机子流检测顺序时,这种算法的误码率性能仍优于Golden MMSE检测算法。在相同算法下,采用宽线性检测至少带来了3dB的性能增益。

A new minimum mean squared error （MMSE） detector based on widely linear processing combined with the decision feedback （DF） strategy for V-BLAST signals is proposed. It can deal with the poor performance of traditional DF detection under higher signal-noise-ratio （SNR）. Simulations show that the performance of the proposed scheme utilizing optimal order approaches that of maximum likelihood detection. Furthermore, the algorithm with random order outperforms the Golden MMSE detection. Under the same simulation condition, there is at least 3 dB gain in bit-error-ratio （BER） performance by adopting widely linear processing.