J4 ›› 2010, Vol. 37 ›› Issue (4): 581-586.doi: 10.3969/j.issn.1001-2400.2010.04.001

• 研究论文 •    下一篇

MU-MIMO下行链路双阈值有限反馈机会通信策略

李钊;杨家玮;赵林靖   

  1. (西安电子科技大学 综合业务网理论及关键技术国家重点实验室,陕西 西安  710071)
  • 收稿日期:2009-04-20 出版日期:2010-08-20 发布日期:2010-10-11
  • 通讯作者: 李钊
  • 作者简介:李钊(1981-),男,讲师,博士,E-mail: zli_19912@126com.
  • 基金资助:

    国家杰出青年科学基金资助项目(60725105);国家重点基础研究发展计划(973计划)资助项目(2009CB320404);长江学者和创新团队发展计划资助项目(IRT0852);国家自然科学基金资助项目(60902032);高等学校引智计划资助项目(B08038);教育部科学技术研究重点资助项目(107103);重大专项面向WRC11的频谱有效利用关键技术研究及验证(2009ZX03007-004);中央高校基本科研业务费专项资助项目(JY10000901030)

Double thresholds opportunistic transmission strategy in the MU-MIMO downlink with limited feedback

LI Zhao;YANG Jia-wei;ZHAO Lin-jing   

  1. (State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an  710071, China)
  • Received:2009-04-20 Online:2010-08-20 Published:2010-10-11
  • Contact: LI Zhao

摘要:

针对多用户MIMO下行链路,提出一种双阈值有限反馈机会通信策略.该策略引入双阈值,在每个时隙,仅信道增益满足主阈值要求的用户向基站反馈信息,并成为可被基站调度的候选用户;次级阈值由主阈值推导得到,用于移动用户选择传输方式,包括波束成形和空分复用.基站根据反馈信息从候选用户中选择一个进行通信.理论分析和Monte-Carlo仿真结果表明,该策略能够有效降低反馈开销,获得高的系统容量和好的系统中断性能.

关键词: 多用户, MIMO系统, 机会通信, 反馈, 自适应

Abstract:

We introduce a double thresholds opportunistic transmission scheme in the multiuser MIMO downlink with limited feedback. In the strategy two thresholds are employed. In each time slot the mobile station (MS) whose channel gain exceeds the primary threshold is eligible for feeding back information and becomes the candidate which could be scheduled by the base station (BS). The secondary threshold is derived from the primary one and used for MS's transmission mode selection, including beamforming (BF) and spatial multiplexing (SM). With feedback information, the BS schedules one user out of candidate MSs. Theoretical analysis in company with Monte-Carlo simulation are employed. Results show that the scheme can effectively reduce the feedback load, achieve high system capacity and good outage performance.

Key words: multiuser, MIMO systems, opportunistic transmission, feedback, adaptation