信道估计误差下多用户MIMO/OFDM下行系统自适应传输  

Adaptive Resource Allocation Scheme for Multiuser MIMO/OFDM Downlink with Channel Estimation Error

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：《计算机科学》2007年第10期52-55,共4页Computer Science

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

摘　　要：以系统总速率最大化为目标,提出在非理想信道信息情形下基于空分复用的多用户MIMO/OFDM下行系统的自适应资源分配方案,并满足用户的QoS要求。该方案首先根据用户信道估计误差模型和用户QoS对用户进行子载波分配,然后在各个子载波上进行功率和比特分配。仿真结果表明,该方案相对静态分配方案可获得更大的总速率,而且对信道估计错误更加强健,可应用到信道信息不确定的实际系统中。In this paper, we propose an adaptive resource allocation scheme for spatial multiplexing based multi-user MIMO/OFDM downlink system under imperfect channel information to maximize the system sum-rate and satisfy user＇s QoS parameters. Specially, sub-carriers are first allocated according to user＇s channel estimation error model and QoS parameters. Then power and bit allocation is carried out on each sub-carrier accordingly. Simulation results show that the proposed adaptive scheme could achieve more system sum-rate than the fixed scheme. And it is more robust to channel error and more practical in realistic wireless communication systems with channel uncertainties.

关 键 词：多天线多载波 信道估计误差 自适应资源分配 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]