High‐rate relay beamforming for simultaneous wireless information and power transfer

Abstract

A high-rate beamforming design is reported for amplify-and-forward wireless relay networks with simultaneous information and power transfer. To achieve high sum rate, a new relay beamformer is designed to support multi-pair source-destination communication links as well as an energy receiver simultaneously, instead of serving one information transmitter at a time. An energy-harvesting constrained sumrate maximisation problem for this design is formulated, then relaxed and reformulated into a series of convex problems, which can be iteratively solved in polynomial time, eventually leading to a high-rate beamforming solution. Simulation results confirm the performance gain and fast convergence of the developed beamforming design.

Joint Transceiver Design Algorithms for Multiuser MISO Relay Systems with Energy Harvesting

“…Hence, problem (13) can be reformulated as the following problem by ignoring the rank-one constraints for all F k s:…”

“…Based on Proposition 4.1 in [36], it can be verified that {F * k } and {ρ * k } satisfy the first two sets of constraints of problem (15) with equality and {F * k } satisfy rank(F * k ) = 1, ∀k. Thus the optimal solution of problem (13)…”

“…With the help of (16) and (17), the SINR and EH constraints in problem (13) can be expressed as the following two inequalities (20). 3.…”

“…Hence, (13) can be reformulated as the following SDP problem by employing the well-known SDR technique…”

“…In [12], the relay beamforming design problem for the SWIPT scheme was considered in a non-regenerative two-way multi-antenna relay network, where a global optimal solution, a local optimal solution and a low-complexity suboptimal solution were proposed. The design of a high-rate beamformer that supports multiple communication pairs and intended for SWIPT in wireless relay networks was considered in [13]. In [14], a game-theoretical framework was developed to address the distributed power splitting problem for SWIPT in relay interference channels.…”