多用户MIMO-OFDM系统中基于非理想反馈的自适应子载波分配  

Adaptive subcarrier allocation for multiuser MIMO-OFDM systems based on imperfect feedback

作　　者：孙群龙[1] 卫国[1] 

机构地区：[1]中国科学技术大学无线网络通信安徽省重点实验室,安徽合肥230027

出　　处：《中国科学技术大学学报》2010年第4期412-418,共7页JUSTC

基　　金：国家自然科学基金重大项目(60496314)资助

摘　　要：考虑基于VBLAST架构的多用户MIMO-OFDM系统中的资源分配问题,提出了一种基于非理想反馈的自适应子载波分配算法.该分配算法综合考虑了反馈信道信息和反馈质量,为表征反馈质量,引入了置信系数和等价方差的定义,推导了实际中反馈时延和反馈误差同时存在时置信系数和等价方差的通用闭式表达.仿真结果表明,所提出的分配算法在各种非理想反馈情况下,均可改善系统性能.An adaptive subcarrier allocation algorithm based on imperfect feedback was proposed for multiuser MIMO-OFDM systems with VBLAST architecture.Not only the feedback channel information,but also the feedback quality were considered in the algorithm.The definitions of confidence coefficient and equivalent variance were introduced to indicate the feedback quality,and the closed expressions were deduced in actual environments considering both feedback delay and feedback error.Simulation results show that the proposed algorithm can improve system performance in various imperfect feedback scenarios.

关 键 词：MIMO-OFDM 子载波分配 非理想反馈 

分 类 号：TN929.5[电子电信—通信与信息系统]