Optimized Training and Feedback for MIMO Downlink Channels

被引：7
|
作者：
Kobayashi, Mari [1 ]
Jindal, Nihar [2 ]
Caire, Giuseppe [3 ]
机构：
[1] SUPELEC, Gif Sur Yvette, France
[2] Univ Minnesota, Minneapolis, MN 55455 USA
[3] Univ Southern Calif, Los Angeles, CA 90089 USA
来源：
ITW: 2009 IEEE INFORMATION THEORY WORKSHOP ON NETWORKING AND INFORMATION THEORY | 2009年
关键词：
D O I：
10.1109/ITWNIT.2009.5158576
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
We consider a MIMO fading broadcast channel where channel state information is acquired at user terminals via downlink training and channel feedback is used to provide transmitter channel state information (CSIT) to the base station. The feedback channel (the corresponding uplink) is modeled as an AWGN channel, orthogonal across users. The total bandwidth consumed is the sum of the bandwidth/resources used for downlink training, channel feedback, and data transmission. Assuming that the channel follows a block fading model and that zero-forcing beamforming is used, we optimize the net achievable rate for unquantized (analog) and quantized (digital) channel feedback. The optimal number of downlink training pilots is seen to be essentially the same for both feedback techniques, but digital feedback is shown to provide a larger net rate than analog feedback.
引用
收藏
页码：226 / +
页数：2
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