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

TL;DR

This paper analyzes a multi-pair two-way massive MIMO relay system over Rician fading channels with imperfect CSI, deriving spectral efficiency expressions and power-scaling laws, validated by simulations.

Contribution

It provides closed-form spectral efficiency expressions and power-scaling laws for multi-pair massive MIMO relaying under Rician fading with imperfect CSI, which is a novel analysis.

Findings

Closed-form spectral efficiency approximations

Power-scaling laws under imperfect CSI

Simulation validation of theoretical results

Abstract

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