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| Limited Feedback-based Maximum SINR Linear Antenna Combiner for MIMO Broadcast Channels |
| Lü Lei Zhang Zhong-pei |
| National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu 611731, China |
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Abstract MultiUser Interference (MUI) caused by channel quantization error degrades the performance of the limited feedback-based multiuser Multiple-Input Multiple-Output (MIMO) systems. Antenna combining techniques can effectively improve the system performance with the additional dimension of freedom. In this paper, a linear antenna combiner is proposed for the feedback overhead allocation strategy which is proved to be the optimal scheme. First, the closed-form lower bound of each user’s expected post-combining Signal-to-Interference- plus-Noise Ratio (SINR) is derived. Then, using this bound expression, the proposed combiner is obtained which aims to maximize the expected post-combining SINR. Monte Carlo simulations show that the proposed combiner achieves better performance compared with the existing antenna combining algorithms.
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Received: 28 August 2013
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Corresponding Authors:
Lü Lei
E-mail: lvlei@uestc.edu.cn
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2014, Vol. 36 
