Optimizing Transmitter-Receiver Collaborative-Relay Beamforming with Perfect CSI

Optimizing Transmitter-Receiver Collaborative-Relay Beamforming with Perfect CSI
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DOI：
10.1109/lcomm.2011.011811.101720
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发表时间：
2011-01
期刊：
IEEE Communications Letters
影响因子：
--
通讯作者：
Lei Chen;Kai‐Kit Wong;Haixia Chen;Ju Liu;G. Zheng
Lei Chen;Kai‐Kit Wong;Haixia Chen;Ju Liu;G. Zheng
中科院分区：
其他
文献类型：
--
作者：
Lei Chen;Kai‐Kit Wong;Haixia Chen;Ju Liu;G. Zheng

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This letter studies a three-hop channel constructed by collaborative relaying terminals at both the transmitter and receiver ends. Our objective is to optimize the complex amplify-and-forward (AF) weights of the relaying terminals if the channel state information (CSI) is exploited. A near-optimal numerical solution for the collaborative-relay beamforming (CRBF) weights is first found from solving an unconstrained multi-variant minimization problem. Using the concept of subspace averaging, a near-optimal closed-form CRBF solution is then proposed.