Abstract
We consider a multipair two-way full-duplex relay network, where multiple pairs of full-duplex users can exchange information through a common relay station with a single massive array. Each user has one shared-antenna and the relay station has $M$ shared-antennas. The relay adopts amplify-and-forward protocol, and the beamforming is performed using maximal-ratio combining/transmission or zero-forcing reception/transmission method. When the number of relay antennas grows to infinity or large enough, we derive the asymptotic transmit power of relay and the asymptotic/approximate spectral efficiency with/without power-scaling. The users’ transmit powers are optimally allocated to maximize the spectral efficiency under the users’ total transmit power constraint. Simulations verify our asymptotic and approximate results with large-scale antenna array, and demonstrate the spectral and energy efficiency with optimal power allocation.
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