Rate-Energy Balanced Precoding Design for SWIPT Based Two-Way Relay Systems

Simultaneous wireless information and power transfer (SWIPT) technique is a popular strategy to convey both RF energy for harvesting at receivers. In this regard, we consider two-way relay system with multiple users multi-antenna employing SWIPT strategy, where splitting the received signal leads rate-energy trade-off. literature, works on transceiver design have been studied using computationally intensive suboptimal convex relaxation based schemes. paper, study balanced precoder chordal distance (CD) decomposition, which incurs much lower complexity, flexible dynamic requirements. It analyzed that given non-negative value of CD, achieved harvested proposed higher than perfect interference alignment (IA) precoder. The corresponding loss in sum rates also via an upper bound. Simulation results add IA schemes mean-squared error are better suited maximization subspace alignment-based methods.