Partial-Differential Distributed Cyclic Delay Diversity for Nonregenerative Two-Way Relaying System

Abstract

In wireless <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ad-hoc</i> networks, network coding can take advantage of the bi-directional traffic flows to increase the achievable throughput. In this letter, on the one hand, cooperative diversity based on distributed cyclic delay diversity is integrated into the physical network coding scheme to combat fading in wireless channel. On the other hand, to reduce the system overhead for the coherent detection at each destination terminal, differential modulation based on linear constellation precoding is proposed. Theoretical analysis and numerical results both confirm that our two-way relaying scheme can achieve full spatial diversity. Furthermore, the proposed scheme can significantly improve the performance over traditional one-way wireless relay scheme and the existing two-way wireless relay schemes due to its enhanced spectral efficiency and lower implementation complexity.