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Coordinated User Scheduling Based on Hybrid CSI in Multi-User MIMO Relay System with Limited Feedback

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Abstract

This paper considers coordinated user scheduling in a multi-user two-hop multi-input multi-output relay system with limited feedback. The proposed scheme utilizes a quantized transmit correlation and channel quality information, enabling to achieve both interference mitigation and multi-user diversity (MUD) gain. To this end, we first investigate the effect of quantization error on the statistical characteristics of co-channel interference (CCI) cased by the relay. Then, the coordinated user-scheduling strategy is designed with the use of eigen-beamforming to maximize the desired signal power in an instantaneous manner while minimizing the CCI in an average sense. Analytic and numerical results show that the proposed scheme can maximize the achievable sum-rate by handling a tradeoff between interference mitigation and MUD gain according to the number of quantization bits, providing a large sum-rate performance in the presence of quantization error.

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Authors and Affiliations

  1. School of Electrical Engineering and INMC, Seoul National University, Seoul, Korea

    Hee-Nam Cho, Hyung-Sin Kim & Yong-Hwan Lee

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  1. Hee-Nam Cho
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  2. Hyung-Sin Kim
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  3. Yong-Hwan Lee
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Correspondence to Hee-Nam Cho.

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Cho, HN., Kim, HS. & Lee, YH. Coordinated User Scheduling Based on Hybrid CSI in Multi-User MIMO Relay System with Limited Feedback. Wireless Pers Commun 67, 937–950 (2012). https://doi.org/10.1007/s11277-011-0420-6

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  • DOI: https://doi.org/10.1007/s11277-011-0420-6

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