块对角化预编码MIMO系统多用户调度

研究了在多用户、多输入多输出(MU-MIMO)系统中发射端块对角化(BD)预编码方案的实现算法，以及基于该预编码方案的多用户调度算法. 利用子空间分解技术设计了发端的预编码矩阵. 通过该预编码矩阵，系统可以实现与多个用户同时进行多码流、用户间的零干扰通信. 定性分析了该预编码方案的本质，利用子空间分解技术设计了一种基于系统最大和容量准则的多用户调度方案. 通过分析说明该调度方案具有较低的计算复杂度. 数值仿真表明，在相同的块对角化预编码方案下，采用本文提出的用户调度方案可获得近似最优的和容量，进一步说明了本文所提方案的有效性.

Multi-user Scheduling in MIMO System with Block Diagonalization

Implementation of block diagonalization (BD) pre-coding scheme and related multi-user scheduling in multi-user multiple input multiple output (MU-MIMO) system are investigated. By exploiting the subspace decomposition technique, we design the transmit pre-coder matrix to realize simultaneous communications with zero multi-user interference and multiple data streams between transmitter and multi-user. Analysis of the BD scheme is carried out. Based on the maximum sum-capacity criteria, a multi-user scheduling algorithm is proposed with the BD scheme. Its low complexity is shown. Simulations show that, with the BD pre-coding scheme, the achievable throughput of the system adopting the proposed user scheduling is approximately the same as that of the system taking the brute searching user scheduling, and directly validate the proposed user scheduling.