On the feasibility of full-duplex relaying in the presence of loop interference

• Published in: 2009 IEEE 10th Workshop on Signal Processing Advances in Wireless Communications pp. 275 - 279
• Main Authors: Riihonen, Taneli, Werner, Stefan, Wichman, Risto, Zacarias, Eduardo B.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.06.2009
• Subjects: Acoustic signal processing; Decoding; Degradation; Directive antennas; High definition video; Interference elimination; Land mobile radio cellular systems; Mobile antennas; Protocols; Relays
• ISBN: 9781424436958; 1424436958
• ISSN: 1948-3244
• DOI: 10.1109/SPAWC.2009.5161790

We consider a two-hop infrastructure-based relay link with three transmit power allocation methods. Both amplify-and-forward and decode-and-forward protocols are studied. Fundamentally, a relay can operate either in a full-duplex or in a half-duplex mode. The performance in full-duplex relaying is degraded due to loop interference from the relay output to the relay input. On the other hand, the half-duplex mode eliminates the loop interference, but this reduces the end-to-end rate. In this paper, we study the feasibility of the full-duplex mode in terms of end-to-end capacity. In particular, we evaluate break-even loop interference levels, below which the full-duplex mode outperforms the half-duplex mode. The analysis shows that the full-duplex mode is feasible in the presence of reasonably high loop interference power and can offer higher capacity than the half-duplex mode.