多输入多输出系统广播信道有限反馈的用户调度算法

A Multiuser Scheduling Algorithm for MIMO Broadcast Channels with Limited Feedback

针对多输入多输出(MIMO)系统广播信道多用户调度的问题,提出了一种有限反馈条件下的用户快速调度算法.算法中用户端将信道对应码字和可达传输速率估计值反馈给基站;基站预先将码字分组,调度时根据接收到的反馈信息将用户归入不同码字代表区域进行快速筛选;然后比较各码字组对应用户确定最优的用户组.仿真结果表明,该算法的系统传输速率较高,能够实现多用户分级,并且算法复杂度较低,在实际系统中易于实现.

This paper addresses the issue of multiuser scheduling with limited feedback in MIMO broadcast channels.A new user selection algorithm was proposed.In order to exploit multiuser diversity,users feedback the estimation of the available transmit rates as well as the channel directional information.At first,the transmitter divides all the codewords into groups according to their cross-correlation coefficients.When scheduling,the users are assigned to different groups corresponding to different code regions and then the active user group is selected among the groups.Simulation results show that the presented algorithm can achieve good sum-rate performance and obtain the optimal multiuser diversity,with low computational complexity.