Recent Advances in Amplify-and-Forward Two-Hop Relaying
Stefan Berger, Timo Unger, Marc Kuhn, Anja Klein, and Armin Wittneben
Communications Magazine, July 2009.
[BibTeX, LaTeX, and HTML Reference]
In this article we review an important class of wireless cooperation protocols known as amplify-and-forward (AF) relaying. One or more low-complexity relay nodes assist the communication between sources and destinations without having to decode the signal. This makes AF relaying transparent to
modulation and coding of the source/destination communication protocol. It is therefore a highly flexible
technology that qualifies for the application also in heterogeneous networks comprising many nodes
of different complexity or even standards. Recently, two-way-relaying was introduced, which is readily
combined with AF relaying. It is a spectrally efficient protocol that allows for bidirectional communication
between sources and destinations.
In order to investigate the potential of wireless AF relaying, we introduce three distributed network
scenarios that differ in the amount of cooperation between the nodes. New challenges arise in those
networks and we discuss approaches to overcome them. For the most general case of a completely
distributed system, we present coherent relaying solutions that offer a distributed spatial multiplexing
gain even for single antenna nodes. Based on real-world experiments we validate the feasibility of all
schemes in our lab.
Download this document:
Copyright Notice: © 2009 S. Berger, T. Unger, M. Kuhn, A. Klein, and A. Wittneben.
This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.