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Tomlinson-Harashima(TH)预编码是一种非线性串行预均衡技术。为了优化多输入多输出(MIMO)系统中的多用户空间复用策略以获取更大的系统容量,提出一种基于TH预编码的多用户空间复用方案。在该方案中,接收端进行波束成形,发送端通过TH预编码进行用户间干扰抑制,同时采用层间轮换的用户调度机制。理论分析和仿真结果均表明,与传统的基于奇异值分解(SVD)的单用户空间复用和基于线性迫零(ZF)的多用户空间复用相比,该方案能获得更大的等效信道增益和系统容量,且兼顾用户间的公平性。
Tomlinson-Harashima (TH) precoding is a non-linear serial pre-equalization technique. In order to optimize the multi-user spatial multiplexing strategy in multiple-input multiple-output (MIMO) system to obtain larger system capacity, a multi-user spatial multiplexing scheme based on TH pre-coding is proposed. In this scheme, the receiving end performs beamforming, and the transmitting end suppresses inter-user interference by TH precoding, and adopts the user scheduling mechanism of inter-layer rotation. Both theoretical analysis and simulation results show that the proposed scheme can achieve greater equivalence than traditional single-user spatial multiplexing based on singular value decomposition (SVD) and multi-user spatial multiplexing based on linear zero-forcing (ZF) Channel gain and system capacity, and take into account the fairness between users.