MIMO系统中基于TH预编码的多用户空间复用方案

TH precoding based multiuser spatial multiplexing scheme in MIMO systems

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 precoding （THP） is a nonlinear, successive pre-equalization technique. A THP-based multiuser spatial multiplexing scheme was developed to improve the system capacity in multiple-input multiple-output （MIMO） systems. In this scheme, the receivers perform beam-forming, while the transmitter suppresses the inter-user interference using the THP scheme. A theoretical analysis and simulation results indicate that, compared with the traditional singular value decomposition （SVD） based single-user spatial multiplexing and linear zero-forcing （ZF） based multiuser spatial multiplexing, the scheme obtains larger equivalent channel gains and system capacity, and at the same time, guarantees user fairness.