新一代高速无线局域网中用户调度及波束成形算法  

User-scheduling and Beamforming algorithm for the New Generation High-Throughput Wireless Local Area Network

作　　者：周子铨[1] 何世文[1] 黄永明[1] 杨绿溪[1] 

机构地区：[1]东南大学信息科学与工程学院,南京210096

出　　处：《信号处理》2013年第7期838-845,共8页Journal of Signal Processing

基　　金：国家自然科学基金(61271018;61071113;61201172);教育部新世纪优秀人才资助计划(NCET-11-0088);国家科技重大专项(2012ZX03004005-003);江苏省自然科学基金(BK2011597;BK2011019);江苏省工业支撑项目(BE2012167)

摘　　要：针对新一代高速无线局域网IEEE 802.11ac协议的多用户多输入多输出正交频分复用(MU-MIMOOFDM)技术,本文主要研究了该高速无线局域网协议反馈机制下的用户调度及波束成形算法。首先描述了新一代高速无线局域网协议的反馈机制,并给出了基于部分信道状态信息的预编码方法。然后利用新一代高速无线局域网的频率选择性信道环境和用户独占所有带宽的特性,提出了一种综合考虑整个带宽信道状况的基于有限反馈的半正交化用户调度算法。为了降低所提算法的计算复杂度,进而提出了一种基于最大特征值的用户调度算法。分析结果表明所提算法可有效实现多载波情况下的用户调度。数值仿真表明,所提算法相比随机调度算法有一定性能增益。According to Multi-user Multi-input Multi-output orthogonal frequency division multiplexing（MU-MIMO OFDM） technology in the new generation high-throughput wireless local area network（WLAN）,a multi-user scheduling and beamforming algorithm based on feedback mechanism was proposed for the high-throughput WLAN.Firstly,the feedback mechanism of the new high-throughput WLAN network was described.A precoding method based on partial channel state information（PCSI） was further developed.Then,based on the frequency-selective channels and the features that the user occupies all the bandwidth of the new generation high-throughput WLAN,a semi-orthogonal multi-user scheduling algorithm,considering the channels over all the bandwidth and based on the limited feedback channel state information（CSI）,was proposed.In order to reduce the computational cost,a simple maximum eigenvalue multi-user scheduling algorithm was further proposed.It is shown that the proposed algorithm implemented the multi-carrier multi-user scheduling effectively.Numerical results show that the proposed algorithm can achieve performance gains over that of stochastic scheduling algorithm.

关 键 词：无线局域网 用户调度 多载波 半正交化 有限反馈 

分 类 号：TN911.7[电子电信—通信与信息系统]