Joint Source and Relay Optimization for Non-Regenerative MIMO Two-Way Relay Systems With Imperfect CSI
In this paper, the authors consider a non-regenerative MIMO two-way relay system with imperfect Channel State Information (CSI). They employ a stochastic approach to model the channel uncertainties and address the robust joint source and relay optimization problem based on the Minimum Mean Squared Error (MMSE) criterion. With imperfect CSI, the Self-Interference (SI) cannot be completely canceled at destination nodes. Hence, both channel uncertainties and residual self-interference should be considered. They develop an optimization framework that unifies both Frequency-Division Duplex (FDD) and Time-Division Duplex (TDD) systems despite their different channel statistical properties.