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This letter deals with the joint information and energy processing at areceiver of a point-to-point communication channel. In particular, thetrade-off between the achievable information rate and harvested energy for amultiple-antenna power splitting (PS) receiver is investigated. Here, the rate-energy region characterization is of particular interest, which isintrinsically a non-convex problem. In this letter, an efficient algorithm isproposed for obtaining an approximate solution to the problem in polynomialtime. This algorithm is mainly based on the Taylor approximation in conjunctionwith semidefinite relaxation (SDR) which is solved by interior-point methods.Moreover, we utilize the Gaussian randomization procedure to obtain a feasiblesolution for the original problem. It is shown that by proper receiver designthe rate-energy region can be significantly enlarged compared to the state ofthe art, while at the same time the receiver hardware costs is reduced byutilizing less number of energy harvesting circuitry.

Optimal Power Splitting for Simultaneous Information Detection and Energy Harvesting