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本文研究了MIMO系统中分层空时编码的垂直分层空时结构(V-BLAST)下的四种信号检测方法:最大似然检测、迫零检测、QR分解检测、排序QR分解检测。通过仿真分析,分别从误码率、复杂度、适用性三方面比较了不同天线结构下的四种检测算法的性能。仿真结果表明,ML算法的误码率性能最优但复杂度最高,一般适用于理论分析;排序QR分解算法在误码率和复杂度性能上取得了较好的折衷,实用性较强。
In this paper, we study four kinds of signal detection methods in V-BLAST under layered space-time coding in MIMO system: maximum likelihood detection, zero-forcing detection, QR decomposition detection and sorting QR decomposition detection. Through the simulation analysis, the performance of the four detection algorithms under different antenna structures are compared respectively from the bit error rate, complexity and applicability. The simulation results show that ML algorithm has the best error rate performance but the highest complexity and is generally suitable for theoretical analysis. The ranking QR decomposition algorithm achieves a good compromise between bit error rate and complexity performance, and is highly practical.