论文部分内容阅读
V-BLAST系统中,应用多星座图映射,不仅可以提高系统性能,而且可以降低接收机复杂度.如果利用强纠错的信道编码对V-BLAST每层数据进行独立编码,检测时,干扰消除前先进行信道编码的译码,然后再编码“重生”干扰信号,可以进一步降低误差传播,提高系统性能。在平坦衰落情况下,这种信道编码反馈方法很容易实现,但是,在频率选择性信道下应用OFDM技术,不同子载波上发射符号经历完全不同的衰落,对每个子载波应用OSIC,应该先检测的符号会随机分布于各层,而不在同一编码层,所以不能直接应用.文中提出将多星座图映射的V-BLAST与信道编码反馈相结合,降低排序的必要性,在接收端采用固定顺序的SIC算法,可以在不排序的情况下降低误差传播,仿真结果表明此方法可以提高系统性能并且具有较低的复杂度。
V-BLAST system, the application of multi-constellation mapping, not only can improve system performance, but also reduce the complexity of the receiver.If the use of strong error correction channel coding V-BLAST each layer of data for independent coding, detection, interference cancellation Before the first channel coding decoding, and then encoding “rebirth ” interference signal, you can further reduce the error propagation, improve system performance. In the case of flat fading, this channel coding feedback method is easy to implement. However, applying OFDM technology on frequency selective channels, the transmitted symbols on different subcarriers experience completely different fading. Applying OSIC to each subcarrier should first detect Symbols are randomly distributed at different layers but not in the same coding layer, so they can not be applied directly.This paper proposes the combination of V-BLAST with multi-constellation mapping and channel coding feedback to reduce the necessity of ordering, The SIC algorithm can reduce the error propagation without sorting. The simulation results show that this method can improve the system performance and has lower complexity.