一种低复杂度的空时多用户迭代检测方案

A Low Complexity Scheme for Space-Time Multi-user Iterative Detection

该文针对已有的对多用户空时编码系统的研究大都集中在多用户STTC和STBC方案,提出一种联合Turbo-BLAST的多用户空时方案。在接收端,针对传统的基于符号干扰抵消(Symbol-Level Cancellation,SLC)与检测的迭代接收机复杂度仍然较高的前提下,提出一种低复杂度的基于比特级干扰抵消(Bit-Level Cancellation,BLC)的迭代检测方案。该方案在检测部分将M-QAM调制符号分解成为一系列的BPSK符号的线性组合,采用比特级的干扰抵消。理论分析和仿真结果表明,该文提出的方案在保持BLAST高频谱效率的同时,与传统检测方案相比,在不降低系统性能的前提下,计算复杂度得到了很大程度的降低。

In multiuser space-time coding system the research already made is almost focused on STTC and STBC scheme. For this reason, a multiuser space-time coding system combined with Turbo-BLAST scheme is proposed. The conventional iterative receiver with Symbol-Level Cancellation （SLC） and detection still has a high computation complexity, so a low complexity iterative receiver scheme with Bit-Level Cancellation （BLC） and detection is proposed which can performs bit-level cancellation by decomposing of an M-QAM constellation into a linear combination of binary constellations. Theoretic analysis and simulation results show that the proposed scheme has a low complexity with no performance degradation compared with conventional iterative receiver, while the high spectral efficiency of the system from BLAST is retained.