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We investigate a multi-pair two-way decode-andforward relaying aided massivemultiple-input multiple-output antenna system under Rician fading channels, inwhich multiple pairs of users exchange information through a relay stationhaving multiple antennas. Imperfect channel state information is considered inthe context of maximum-ratio processing. Closedform expressions are derived forapproximating the sum spectral efficiency (SE) of the system. Moreover, weobtain the powerscaling laws at the users and the relay station to satisfy acertain SE requirement in three typical scenarios. Finally, simulationsvalidate the accuracy of the derived results.

Multi-Pair Two-Way Massive MIMO DF Relaying Over Rician Fading Channels Under Imperfect CSI