信道反馈延迟时上行多用户MIMO中继系统预编码

doi:10.3969/j.issn.0255-8297.2017.02.003

Abstract

Abstract:

This paper proposes an optimal linear precoding scheme for uplink multi-user multiple-input multiple-output (MIMO) relay systems applicable to a channel with feedback delay and channel estimation errors. Limitations of the channel estimation method and the time delay of feedback link are considered. Design of transceiver is simplified as an optimal problem with precoding matrix variables, derived with a maximum power constraint at the relay station based on the minimum mean-square error (MMSE) criterion. The relay precoding matrix and decoding matrix are obtained, and the equalizer optimized with a linear iterative searching algorithm. Numerical simulation shows that the proposed scheme can effectively reduce the bit error rate of the system when channel feedback delay and estimation error exist.

Key words: multiple-input multiple-output (MIMO) relay, feedback delay, precoding, multi-user, bit error rate (BER)

CLC Number:

TN98

SU Jun-xu, CHEN Xiao-min, HU Xu-jun, ZHU Qiu-ming. Precoding for Up-link Multi-user MIMO Relay Systems with Feedback Delay[J]. Journal of Applied Sciences, 2017, 35(2): 160-170.

References

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Precoding for Up-link Multi-user MIMO Relay Systems with Feedback Delay

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