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

We investigate a multi-pair two-way decode-and-forward relaying aided massive multiple-input multiple-output antenna system under Rician fading channels, in which multiple pairs of users exchange information through relay station having antennas. Imperfect channel state is considered the context maximum-ratio processing. Closed-form expressions are derived for approximating sum spectral efficiency (SE) system. Moreover, we obtain power-scaling laws at and to satisfy certain SE requirement three typical scenarios. Finally, simulations validate accuracy results.