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Linear Precoding Technique for AF MIMO Relay Systems  

Yoo, Byung-Wook (Dept. of Electrical and Electronic Eng., Yonsei University)
Lee, Kyu-Ha (R&D Center, CampNet)
Lee, Chung-Yong (Dept. of Electrical and Electronic Eng., Yonsei University)
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Abstract
In this paper, the linear source and relay precoders are designed for AF MIMO relay systems. In order to minimize mean squared error (MSE) of received symbol vector, the source and relay precoders are proposed, and MMSE receiver which is suitable to those precoders is utilized at the destination node. As the optimal precoders for source and relay nodes are not represented in closed form and induced by iterative method, we suggest a simple precoder design scheme. Simulation results show that the performance of the proposed precoding scheme is comparable with that of optimal scheme and outperforms other relay precoding schemes. Moreover, in high SNR region, it is revealed that SNR between source and relay node is more influential than SNR between relay and destination node in terms of bit error rate.
Keywords
MIMO relay systems; AF relaying scheme; linear precoding technique; MMSE receiver;
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