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A Simple Amplify-and-Forward Relaying Scheme Based on Clipping and Forwarding for Dual-Hop Transmissions

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Author(s): Xiao Juan Zhang | Yi Gong

Journal: Journal of Communications
ISSN 1796-2021

Volume: 5;
Issue: 4;
Start page: 348;
Date: 2010;
Original page

Keywords: Clip-amplify-forward | relaying | clipping | linear amplification

ABSTRACT
In this paper, we propose a simple relaying protocol, namely clip-amplify-forward (CAF), for dual-hop transmissions. In the CAF relaying protocol, the received signal at the relay node is clipped firstly and then amplified with a fixed amplification gain before retransmission. Only a hard clipper and a linear amplifier are needed at the relay node, where no channel estimation is needed. Simulation results show that with a relatively small amplification gain, the CAF relaying protocol has very close performance to the AF relaying protocol while enjoying the simplicity of implementation. A simple design criterion for the amplification gain is also presented.
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