Chuili Kong, C. Zhong, M. Matthaiou, Emil Björnson, Zhaoyang Zhang
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Multi-pair two-way AF relaying systems with massive arrays and imperfect CSI
We consider a multi-pair two-way amplify-and-forward relaying system with a massive antenna array at the relay and estimated channel state information, assuming maximum-ratio combining/transmission processing. Closed-form approximations of the sum spectral efficiency are developed and simple analytical power scaling laws are presented, which reveal a fundamental trade-off between the transmit powers of each user/the relay and of each pilot symbol. Finally, the optimal power allocation problem is studied.
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