Distributed Alamouti Relay Beamforming Scheme in Multiuser Relay Networks

作者：Li Wen; Dong Min^*

来源：IEEE Signal Processing Letters, 2017, 24(10): 1527-1531.

DOI：10.1109/LSP.2017.2735806

• Alamouti code
• distributed relay beamforming
• multiuser peer-to-peer (MUP2P) communication

We design distributed relay beamforming in a multiuser peer-to-peer relay network. By exploring Alamouti code at both sources and relays, we propose a rank-two Alamouti-based distributed relay beamforming scheme to minimize per relay power, while meeting the signal-to-interference-and-noise ratio targets. For the nonconvex optimization problem, we propose a rankconstrained separable semidefinite relaxation approach to find an approximate solution, and provide conditions for which it produces an optimal solution and a bound on the gap to the optimal performance. Compared with the traditional rank-one distributed relay beamforming scheme, our proposed Alamouti-based rank-two distributed relay beamforming offers a significantly higher likelihood to produce an optimal solution and a better capability to maintain small performance degradation as the network size increases. As a result, it provides substantially improved relay power efficiency.

• 出版日期2017-10