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-A nd-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.
Bibliographical noteFunding Information:
This work was supported in part by the National Natural Science Foundation of China 61501461, 61471269, 61622101 and 61571020; the National 973 Project under grant 2013CB336700, the National 863 Project under grant SS2015AA011306, the National Science Foundation under grant number CNS-1343189 and ECCS-1232305, and the Early Career Development Award of SKLMCCS (Y3S9021F34).
- Two-way relay
- Wireless communications