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Optimal dual-cast beamforming for network coding-based two-way relay transmission

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5 Author(s)
Zhengfeng Xu ; Dept. of Electron. Eng., Tsinghua Univ., Beijing, China ; Hong-Chuan Yang ; Pingyi Fan ; Su Yi
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Dual-cast transmission appears naturally in network coding-based two-way relay systems, where the relay terminal needs to send network coded information to both end users simultaneously. In this paper, we investigate the optimal beamforming design for wireless dual-cast channels. Specifically, we present an efficient closed-form solution of the optimal beamforming vectors and their achievable maximal dual-cast rate for both orthogonal and nonorthogonal user channel cases. Comparison with conventional non-network-coding based schemes shows that the proposed design of dual-cast beamforming with network coding can best explore the capacity benefit of multiple antennas at the relay terminal.

Published in:

Wireless Communications and Mobile Computing Conference (IWCMC), 2011 7th International

Date of Conference:

4-8 July 2011