Rate performance of AF two-way relaying in low SNR region

Authors:
Jingjing Ping;See Ho Ting
Affiliations:
School of Communication and Information Engineering, University of Electronic Science and Technology of China, People's Republic of China;School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore
Venue:
IEEE Communications Letters
Year:
2009

Citing 4
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Abstract

In this letter, two common protocols in cooperative communications, namely one-way and two-way amplify-and-forward (AF) half-duplex relaying, are investigated and compared in terms of rate. It is generally accepted that two-way AF half-duplex relaying is always better than its one-way counterpart in terms of rate. However, we found that depending on the definition of the total power constraint and the SNR, this is not generally true. We derived the SNR threshold, below which one-way relaying actually outperforms two-way relaying. Simulation results show that for power-limited applications operating at extremely low SNR, two-way relaying might not necessarily be a better choice over one-way relaying.