发射相关瑞利衰落信道V-BLAST错误性能分析

Impact of Transmit Correlation on the Error Performance of Rayleigh Fading V-BLAST System

研究了发射相关瑞利衰落信道对垂直分层空时码最大似然接收机比特差错性能的影响。研究发现,最大似然接收机平方欧氏距服从自由度为2×NR的中心卡方分布。在此基础上给出成对差错概率和比特差错概率联合界新的精确表示。用其近似公式定量分析发送相关性对最大似然接收机分集增益及信噪比损失的影响。分析表明,发射相关性不改变最大似然接收机所获得的分集增益,信噪比损失会随着相关系数不同而变化。仿真结果验证了理论分析的正确性。

The paper analyzes the error performance of Vertical Bell Labs Layered Space- Time （V- BLAST） architecture using Maximum Likelihood （ML） receiver in the presence of transmit correlation. The statistical property of the squared Euclidean distance is found to be central chi- square distribution with 2 × NR exact expression of the Pairwise Error Probability （PEP） and the union bound of the BER. The asymptotic result is used to quantify the loss of the diversity order and the penalty of SNR. It is shown the diversity order achieved by ML receiver is unaffected by transmit correlated fading and the loss of SNR is increased with the correlation coefficients. Simulation results are given to corroborate the theoretical analysis.