多小区协作MIMO多模式有限反馈技术.doc

文档介绍：
多小区协作 MIMO 多模式有限反馈技术#
吴雅婷,洪涛*
(上海大学特种光纤与光接入网省部共建教育部重点实验室,上海 200072)
5
10
15
20
25
30
35
40
摘要:针对多小区协作 MIMO 系统,本文提出了一个采用最大化总传输速率波束成型和可切
换模式的有限反馈方案。为提升系统总传输速率,有限反馈方案在三种模式之间切换,每种
模式下选择反馈和量化不同的信道状态信息(CSI),并且其量化精度可随码本大小灵活选择,
而各模式下的反馈比特分配则基于干扰信号强度进行优化。仿真结果表明,在高信干噪比的
情况下,相比传统的方案,新的有限反馈方案能获得更高的总传输比特率。
关键词:协作系统;多小区;有限反馈;信道状态信息
中图分类号:
Multi-mode Limited Feedback for Multicell Cooperative
MIMO Systems
WU Yating, HONG Tao
(Key Laboratory of Special Fiber Optics and Optical work, Shanghai University,
ShangHai 200072)
Abstract: In this paper, a multi-mode limited feedback scheme with sum-rate maximizing
beamforming is proposed for cooperative multicell MIMO systems. In order to enhance the
sum-rate performance, the proposed scheme switches between three modes, where different
channel state information (CSI) is chosen and quantized with variable resolution. The feedback bit
allocation within each mode is optimized according to the interfering signal strength. Simulation
results show that the proposed limited feedback scheme yields higher sum-rate than the
conventional solutions such as non-cooperative eigen-beamforming in the high SINR regime.
Keywords: Cooperative systems; MIMO; Limited feedback; Channel state information
0 引言
随着下一代蜂窝标准的推进,协作通信在近些年来成为通信领域的研究热点。基站间的
协作策略可以减少小区间的干扰,并提高小区边缘的覆盖能力[1-8],P)技
术也因此纳入到 4G 标准如长期演进技术(LTE-A)制定中[9]。为最大化系统总容量,脏纸