一种新的多用户分集系统信道量化与反馈算法ANovel-电子与信息学报.PDFVIP

第 31 卷第 3 期 电 子 与 信 息 学 报 Vol.31No.3 2009 年 3 月 Journal of Electronics Information Technology Mar.2009 一种新的多用户分集系统信道量化与反馈算法 梁学俊 朱光喜 曹 汐 王德胜 (华中科技大学电子与信息工程系 武汉 430074) 摘 要：该文为了解决MIMO-OFDM系统中反馈信息占据大量无线资源的问题，提出一种新颖的信道量化与反馈 算法，包括成簇、量化、反馈3个步骤。成簇利用频域相关性，将相邻子载波组成簇，以簇为基本反馈单元。量化 考虑实际系统中可选调制方式的有限性，以量化信息表明簇内子载波可采用的调制方式。反馈通过簇排序和门限设 置，只将部分具有竞争力的簇信息传送给基站。这种算法具有反馈信息量少、频谱效率损失小等特性，文中均有详 细的理论推导，并通过仿真进行了验证。 关键词：多用户分集；量化；反馈 中图分类号：TN914 文献标识码： A 文章编号：1009-5896(2009)03-0661-05 A Novel Channel Quantization and Feedback Algorithm in Multiuser Diversity Systems Liang Xue-jun Zhu Guang-xi Cao Xi Wang De-sheng (Department of Electronics Information Engineering, Huazhong Univ.of Sci. Tech., Wuhan 430074, China) Abstract: In this paper, the relative content is researched for resolving the problem that a lot of wireless resource is expended by feedback information in MIMO-OFDM system. A novel algorithm including cluster, quantization and feedback is proposed. By utilizing the frequency correlation of the wireless channel, adjacent subcarriers are divided into several cluster and a cluster is seen as a feedback cell. Quantization is proposed by quantized values indicating the modulation level, because a discrete finite set of candidate constellation sizes is applied to practical systems. Finally, partial cluster quality information is transmitted to basestation through ordering and setting threshold. Theory deduction and simulation result show that the proposed algorithm needs only a little feedback information and has a trivial loss in terms of spectrum efficiency. Key words: Multiuser diversity; Quantization; Feedback 1 引言