%0 Journal Article
%T Analysis of Multiuser Diversity in MIMO-OFDM System Based on Channel Feedback Algorithm<br>基于信道反馈的MIMO-OFDM系统多用户分集研究
%A 梁学俊
%A 朱光喜
%A 曹 汐
%A 王德胜
%J 电子与信息学报
%D 2008
%I 
%X Multiuser diversity can significantly improve wireless communication system performance by exploiting the feedback information that conveys the channel quality. In Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing(MIMO-OFDM) structure, the per subcarrier of per user feedback expenses a substantial amount of wireless resource and decreases spectrum efficiency, so various limited channel feedback scheme is proposed to reduce the feedback load. In this paper, the multiuser diversity gain based on two representative limited channel feedback is investigated, and it is compared with ideal feedback. The close-form expression of average spectrum efficiency is deduced with considering a discrete finite set of candidate constellation sizes for practical system. Extensive simulations are presented to evaluate the multiuser diversity performance in various feedback scheme and the results match with the numeral analysis very well. The limited feedback schemes can reduce the feedback load greatly with no loss in terms of multiuser diversity gain only if the feedback parameters are chosen properly, which provides the instruction to design the channel feedback of practical system.
%K MIMO
%K OFDM
%K Channel feedback
%K Multiuser diversity<br>多输入多输出
%K 正交频分复用
%K 信道反馈
%K 多用户分集
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=36FD76B26DFA5EE2BDDC7E273FC82D31&yid=67289AFF6305E306&vid=340AC2BF8E7AB4FD&iid=708DD6B15D2464E8&sid=E47E46FC9ED0D928&eid=AF36F5BA5216EF95&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=1&reference_num=10