A Novel Forwarding Method for Full-Duplex Two-Way Relay Networks

摘要

An estimate-and-forward (EF) scheme for single-input single-output (SISO)and multiple-input multiple-output (MIMO)full-duplex two-way relay networks is proposed and analyzed.The relay estimates the received signal from two terminal nodes by a minimum mean squared error (MMSE)estimation and forwards a scaled version of the MMSE estimate to the destination.The proposed EF outperforms conventional amplify-and-forward (AF) and decode-and-forward (DF) across all signal-to-noise ratio (SNR)region.Because its computational complexity is high for relays with a large number of antennas (large MIMO) and/or high order constellations,an approximate EF scheme,called list EF,are thus proposed to reduce the computational complexity.The proposed list EF computes a candidate list for the MMSE estimate by using a sphere decoder,and it approaches the performance of the exact EF relay at a negligible performance loss.The proposed forwarding approach also could be used to other relay networks,such as half-duplex,one-way or massive MIMO relay networks.