OFDM系统中信道有限反馈的门限设置研究  

Threshold Setting of Channel Limited Feedback in OFDM System

作　　者：唐志华[1] 朱有团[1] 卫国[1] 朱近康[1] 

机构地区：[1]中国科学技术大学电子工程与信息科学系,合肥230027

出　　处：《电子与信息学报》2007年第4期933-937,共5页Journal of Electronics & Information Technology

基　　金：国家自然科学基金重大项目(60390540)资助课题

摘　　要：基于多用户下行OFDM系统资源分配及有限反馈理论的研究,该文推导了基于门限设置的信道有限反馈的容量及容量损失的数学表达式,并提出了3种信道有限反馈的门限设置方案。这3种方案利用多用户分集,从反馈中断概率、容量损失及反馈效用3个角度来设置门限。数值计算结果表明,通过适当的门限设置,可以在相对较少的容量损失下,较大程度地减少反馈量,使得下行多用户OFDM资源分配算法在实际中可以有效应用。In this paper, mathematical expression of channel capacity as well as channel capacity loss due to feedback threshold setting are proposed, which is based on research on resource management in downlink multiuser OFDM systems and limited feedback theory. Three threshold setting schemes are proposed, which are from the aspects of feedback outage probability, capacity loss and feedback utility. Numerical results demonstrate that through setting threshold properly, the feedback can be decreased greatly at the cost of little capacity loss, leading to effective application of resource allocation algorithms in downlink multiuser OFDM systems.

关 键 词：多用户分集 下行OFDM系统 有限反馈 反馈中断概率 反馈效用 

分 类 号：TN929.5[电子电信—通信与信息系统]