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This letter studies a multi-antenna wireless powered communication (WPC)system with co-channel energy and information transfer, where a wireless device(WD), powered up by wireless energy transfer (WET) from an energy transmitter(ET), communicates to an information receiver (IR) over the same frequencyband. We maximize the achievable data rate from the WD to the IR by jointlyoptimizing the energy beamforming at the ET and the information beamforming atthe WD, subject to their individual transmit power constraints. We obtain theoptimal solution to this problem in closed-form, where the optimal energybeamforming at the ET achieves a best energy/interference tradeoff betweenmaximizing the energy transfer efficiency to the WD and minimizing theco-channel interference to the IR. Numerical results show that our proposedoptimal co-channel design is superior to other reference schemes.

Multi-antenna Wireless Powered Communication with Co-channel Energy and Information Transfer