On Asymmetric Multi-Way Relaying X Networks: Remapping of Signal Space Alignment for Network Coding

In this paper, a novel remapping design for multiway relay system with multi-user (MU) is presented. Every user exchanges information with its partners via the relay. The two communication terminals have different modulation schemes according to their individual channel quality. We term this system an adaptive modulation asymmetric multi-way relaying networks, in which signal space alignment for network coding (SSA-NC) and interference nulling beamforming are exploited. For the case of the asymmetric scenario, we design a remapping function in symbol-level at the relay and the corresponding decoding rules at the user side. Monte Carlo simulations demonstrate that the proposed scheme can achieve significant gain.