高速移动环境下基于动态CSI的MIMO系统改进模代数预编码

针对高速移动场景下信道快时变特性给多输入多输出（Multiple Input Multiple Output，MIMO）系统预编码带来的技术挑战，提出基于动态信道状态信息（Channel State Information，CSI）的MIMO系统改进模代数预编码（Tomlinson-Harashima Precoding，THP）算法.该算法利用信道统计量信息以及相关性构建动态CSI模型，更准确实时地体现当前信道状况；进一步地，提出一种基于循环遍历搜索的多用户调度算法，以最大化信干噪比为目标进行用户调度，且将多用户调度算法应用到THP中，提高了预编码精度.仿真结果表明，所提算法相比传统预编码算法具有更优的误码率性能和信道容量，验证了所提算法能有效地适应高速移动场景.

An Improved Tomlinson-Harashima Precoding Based on Dynamic CSI in High-Speed Mobile Scenarios

Aiming at the technical challenges brought about by the fast time-varying characteristics of the channel in high-speed scenes to precoding in multiple input multiple output (MIMO) system,this paper proposes an improved Tomlinson-Harashima precoding (THP) algorithm for MIMO systems based on the dynamic channel state information (CSI) model.Channel statistical information and correlations are exploited to compensate instantaneous CSI,which could reflect current real-time channel status exactly.Further,aimed at maximizing the signal to interference plus noise ratio,a multi-user scheduling algorithm based on loop traversal search is proposed.And the multi-user scheduling algorithm is applied to THP,which could improve the precoding accuracy of the traditional THP.Simulation results show that the proposed scheme can be efficiently applied to high-speed mobile scenario,and improve bit error ratio performance as well as channel capacity.