V-BLAST系统中一种简单的发射功率分配方案

采用发射功率分配方案可以有效地提高V-BLAST系统的性能。一方面,采用注水发射功率分配方案,可以有效地提高系统容量,另一方面,采用合理的发射功率分配方案,可以在固定数据速率时,改善误码率性能。本文针对第二种应用,给出了一种基于等信干噪比的发射功率分配方案,计算复杂度低,需要的反馈信令少,而且该功率分配方案与调制方式和检测算法无关。通过对MMSE串行干扰抵消和MMSE软干扰抵消检测算法仿真验证,其性能远好于不采用发射功率分配方案,同时接近基于拉格朗日极值法的功率分配方案性能。

A Simple Transmit Power Allocation Scheme in V-BLAST System

In V-BLAST system,we can get better performance by using transmit power allocation (TPA).One strategy is water- filling that can increase system capacity.The other strategy can decrease bit error rate(BER) when the transmit data rate is fixed.This paper provides a TPA scheme based on equal SINR for the second strategy.This scheme has a lower implement complexity,requires small signaling feedback and can be used for any modulation.Through simulation of the MMSE successive interference cancellation de- tection algorithm and MMSE iterative soft interference cancellation detection algorithm,it can be found that the performance of proposed scheme is much better than the scheme without TPA and approximate to the TPA scheme based on Lagrange multiplier method.