基于BD预编码和时分复用的MIMO广播传输方案

MIMO Broadcast Transmission Scheme Based on BD Precoding and TDM

在MIMO系统中,块对角化(BD)预编码用来消除多用户的共信道干扰(CCI)。BD预编码要求系统发射天线数大于全部用户接收天线数目的总和。当用户数增多时,用户接收天线总数随之增多,BD算法的复杂度将急剧增大。为了解决这个问题,同时使系统支持的用户数最大化,提出了一种基于BD预编码和时分复用(TDM)相结合的广播传输方案。该方案通过对用户进行分组,对组内的用户进行BD预编码,并对组间进行时分复用,从而降低系统对发射天线数目的要求和算法的复杂度。仿真结果表明,这种组合方案在支持更多用户的同时还可以获得较高的吞吐率。

In MIMO（Multi-Input Multi-Output）system,the block diagonalization（BD）precoding algorithm is applied to eliminate the co-channel interference（CCI）.And BD precoding algorithm requires the number of the system receiving antennas should be less than the number of all users transmitting antennas.With the increasing of system users,the amount of the receiving antennas add,and the complexity of BD algorithm increases sharply.In order to solve the above problem and maximize users capacity supported by the system,this paper presented an transmission scheme based on block diagonalization precoding and time division multiplexing（TDM）.In this scheme,the users are divided into several groups which will be assigned to different slots.The scheme reduces the requirements on the number of system transmitting antennas and the complexity of the algorithm.Simulation results show that the scheme can support more users and increase the throughput of the system.