Comparison of full-duplex and half-duplex modes with a fixed amplify-and-forward relay

Authors:
Taneli Riihonen;Stefan Werner;Risto Wichman
Affiliations:
Helsinki University of Technology, Finland;Helsinki University of Technology, Finland;Helsinki University of Technology, Finland
Venue:
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Year:
2009

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Abstract

We study the fundamental capacity trade-off between full-duplex and half-duplex transmission modes in a twohop communication system with a fixed infrastructure-based amplify-and-forward relay. First, we derive closed-form expressions for the average end-to-end capacity in the relay link. We show that it may be better to tolerate some loop interference with the full-duplex mode than to consume channel resources by allocating two orthogonal channels with the half-duplex mode. Furthermore, we evaluate the maximum loop interference power levels that still allow the full-duplex mode to achieve the same capacity as the half-duplex mode. Our results indicate that with practical signal-to-noise ratio values, the full-duplex mode is preferable in terms of capacity.