In this letter, we propose two-way amplify-and-forward relaying in conjunction with adaptive modulation in order to improve spectral efficiency of relayed communication systems while monitoring the required error performance. We also consider a multiple relay network where only the best relay node is utilized so that the diversity order increases while maintaining a low complexity of implementation as the number of relays increases. Based on the best relay selection criterion, we offer an upper bound on the signal-to-noise ratio to keep the performance analysis tractable. Our numerical examples show that the proposed system offers a considerable gain in spectral efficiency while satisfying the error rate requirements.
Bibliographical noteFunding Information:
This work was supported in part by the IT R&D program of MKE/IITA [2008-F-006-01, Wireless Local Area Communication Systems on Tera Hertz Band] and in part by the Qatar National Research Fund, QNRF (An initiative Qatar Foundation). Digital Object Identifier 10.1109/TCOMM.2010.111710.090617
- Two-way relaying
- amplify-and-forward relaying
- best relay selection and adaptive modulation
ASJC Scopus subject areas
- Electrical and Electronic Engineering