Open Access

Gaussian Broadcast Channels with an Orthogonal and Bidirectional Cooperation Link

EURASIP Journal on Wireless Communications and Networking20082008:341726

DOI: 10.1155/2008/341726

Received: 12 July 2007

Accepted: 1 April 2008

Published: 13 April 2008

Abstract

This paper considers a system where one transmitter broadcasts a single common message to two receivers linked by a bidirectional cooperation channel, which is assumed to be orthogonal to the downlink channel. Assuming a simplified setup where, in particular, scalar relaying protocols are used and channel coding is not exploited, we want to provide elements of response to several questions of practical interest. Here are the main underlying issues: (1) the way of recombining the signals at the receivers; (2) the optimal number of cooperation rounds; (3) the way of cooperating (symmetrically or asymmetrically, which receiver should start cooperating in the latter case); and (4) the influence of spectral resources. These issues are considered by studying the performance of the assumed system through analytical results when they are derivable and through simulation results. For the particular choices we made, the results sometimes do not coincide with those available for the discrete counterpart of the studied channel.

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Authors’ Affiliations

(1)
Laboratoire des Signaux et Systèmes, CNRS-Supélec, Université Paris-Sud 11

Copyright

© E. V. Belmega et al. 2008

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.