Channel State Feedback over the MIMO-MAC

Details Channel State Feedback over the MIMO-MAC Channel State Feedback over the MIMO-MAC

2010-05-10

arxiv.org/abs/1005.1594v1

Computer Science

Information Theory

Submitted to the IEEE Transactions on Information Theory, April 2010

Scientific paper

We consider the problem of designing low latency and low complexity schemes for channel state feedback over the MIMO-MAC (multiple-input multiple-output multiple access channel). We develop a framework for analyzing this problem in terms of minimizing the MSE distortion, and come up with separated source-channel schemes and joint source-channel schemes that perform better than analog feedback. We also develop a strikingly simple code design based on scalar quantization and uncoded QAM modulation that achieves the theoretical asymptotic performance limit of the separated approach with very low complexity and latency, in the case of single-antenna users.

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