一种基于优化阈值的有限反馈预编码算法

在上行链路总反馈量受限的多用户MIMO系统中,小数量用户配合高速率反馈比大数量用户配合低速率反馈具有更优的和速率.但较少的用户反馈却不利于获得多用户分集.针对该问题,提出了一种基于优化阈值的用户选择算法,并根据最优反馈速率从选出用户中确定实施反馈的用户.在用户反馈的信道方向信息和信道质量信息基础上,利用迫零波束成形(ZFBF)算法进行预编码.仿真结果表明,该方案具有比最优反馈速率算法更高的和速率.

A limited feedback precoding algorithm based on threshold optimization

In the total amount of feedback limited uplink multi-user MIMO system,a small number of users with high-rate feedback have prior sum-rate than a large number of users with low-rate feedback.But a small amount users’ feedback is not conducive to multi-user diversity.To this point,an algorithm for user selection based on threshold optimization is proposed and to determine the users for feedback among the users of elected according to optimal feedback rate.On the basis of user feedback channel direction information and channel quality information,the zero-forcing beam-forming algorithm is applied to precoding.Simulation results show that the proposed method has a higher sum-rate than non-threshold selection algorithm with optimal feedback rate.