Multi-antenna downlink channels with limited feedback and user selection

被引：84
|
作者：
Yoo, Taesang [1 ]
Jindal, Nihar [2 ]
Goldsmith, Andrea [1 ]
机构：
[1] Stanford Univ, Dept Elect Engn, Stanford, CA 94305 USA
[2] Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA
来源：
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS | 2007年 / 25卷 / 07期
关键词：
MIMO; quantized feedback; limited feedback; zero-forcing beamforming; multiuser diversity; broadcast channel; scheduling; semi-orthogonal user selection; random beamforming;
D O I：
10.1109/JSAC.2007.070920
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We analyze the sum-rate performance of a multi-antenna downlink system carrying more users than transmit antennas, with partial channel knowledge at the transmitter due to finite rate feedback. In order to exploit multiuser diversity, we show that the transmitter must have, in addition to directional information, information regarding the quality of each channel. Such information should reflect both the channel magnitude and the quantization error. Expressions for the SINR distribution and the sum-rate are derived, and tradeoffs between the number of feedback bits, the number of users, and the SNR are observed. In particular, for a target performance, having more users reduces feedback load.
引用
收藏
页码：1478 / 1491
页数：14
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