Relay Beamforming for Amplify-and-Forward Multi-Antenna Relay Networks with Energy Harvesting Constraint
Relay Beamforming for Amplify-and-Forward Multi-Antenna Relay Networks with Energy Harvesting Constraint
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DOI：
10.1109/lsp.2014.2305737
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发表时间：
2014-02
影响因子：
3.9
通讯作者：
Jianli Huang;Quanzhong Li;Qi Zhang;Guangchi Zhang;J. Qin
中科院分区：
文献类型：
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作者：
Jianli Huang;Quanzhong Li;Qi Zhang;Guangchi Zhang;J. Qin
对于具有能量收集（EH）约束的放大转发多天线中继网络，我们研究了最优中继波束成形问题，该问题在中继的发射功率约束以及能量收集接收机的能量收集约束条件下，最大化从源到信息解码接收机的可实现速率。由于能量收集约束，波束成形问题不是凸的。我们通过将波束成形问题转化为具有秩一松弛和查恩斯 - 库珀变换的凸半定规划，提出了最优波束成形方案。我们还提出了一种次优的闭式波束成形方案。从仿真结果可以看出，当最大允许的中继发射功率与噪声功率比很高时，所提出的次优方案的性能接近最优方案的性能。
For amplify-and-forward multi-antenna relay networks with energy harvesting (EH) constraint, we study the optimal relay beamforming problem which maximizes the achievable rate from source to information-decoding receiver subject to the transmit power constraint at relay and the EH constraint at EH receiver. Because of the EH constraint, the beamforming problem is not convex. We propose the optimal beamforming scheme by converting the beamforming problem into a convex semidefinite programming with the rank-one relaxation and Charnes-Cooper transformation. We also propose a suboptimal closed-form beamforming scheme. It is shown from simulations that when the maximum allowable relay transmit power to noise power ratio is high, the performance of proposed suboptimal scheme approaches that of the optimal scheme.