一种多用户MIMO/OFDM下行链路保障QoS的自适应传输机制  

An Adaptive Scheme with Guaranteed QoS for Multiuser MIMO/OFDM Downlink

作　　者：韩锋[1] 刘应状[1] 朱光喜[1] 卢小峰[1] 

机构地区：[1]华中科技大学电信系,武汉430074

出　　处：《电子与信息学报》2008年第7期1540-1543,共4页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60496315);国家"863"计划(2003AA12331005)资助课题

摘　　要：在用户QoS参数限制下,该文提出一种在多用户MIMO/OFDM下行链路使系统总速率最大的资源分配机制。基站应用空分多址接入,使得每个子载波可支持多个用户,应用线性预编码方法抵消用户间的干扰,提出保障QoS的自适应功率、比特分配方案。该文并提出两种可应用到实际系统的低复杂度的比特加载和比特去除算法,仿真结果表明,该两种方法性能可非常接近最优遍历算法。This paper investigates adaptive resource allocation scheme to maximize the sum-rate under the QoS constraint for multiuser MIMO/OFDM downlink. Specifically, the basestation exploits spatial division multiple access （SDMA） to support several users in each subcarrier, and linear precoding to reduce inferences among users. An adaptive power and bit allocation scheme with guaranteed QoS is provided. And two low-complexity suboptimal bit fill and bit removal algorithms which could be used in practical systems are proposed. Simulation results show that these two algorithms achieve nearly the same performance as the optimal one.

关 键 词：多输入多输出/正交频分复用 资源分配 服务质量 

分 类 号：TN929.5[电子电信—通信与信息系统]