Cross-Layer Issues for Cooperative Networks | IEEE Conference Publication | IEEE Xplore

Cross-Layer Issues for Cooperative Networks


Abstract:

This paper deals with a cross-layer approach for cooperative diversity networks which use a combination of Amplify-and-Forward (AF) and Decode-and-Forward (DF) as a relay...Show More

Abstract:

This paper deals with a cross-layer approach for cooperative diversity networks which use a combination of Amplify-and-Forward (AF) and Decode-and-Forward (DF) as a relaying strategy. Based on a well-selected ad-hoc configuration, the proposed approach combines the AF diversity concept with a simultaneous optimization of Physical, Network and Multiple Access Control layers. The considered optimization problem requires an appropriate distribution of three roles among the network nodes which are the diversity-relays (AF concept), the intermediate-router (DF and routing) and the destination (scheduling). The proposed role assignment is based on the instantaneous channel conditions between the links and jointly supports performance optimization and a long-term fairness concept. In order to minimize the required complexity, a partial and quantized channel feedback is also proposed. The proposed cross-layer solution is compared with conventional approaches by computer simulations and theoretical studies, and we show that it achieves an efficient performance-complexity trade-off.
Date of Conference: 31 March 2008 - 03 April 2008
Date Added to IEEE Xplore: 15 April 2008
Print ISBN:978-1-4244-1997-5

ISSN Information:

Conference Location: Las Vegas, NV, USA

I. Introduction

Cooperative diversity is a new diversity technique that was proposed in the literature as a form of spatial diversity system [1]–[5]. It uses the broadcast nature of the wireless medium and its basic idea is that the terminals, which are in the coverage area of a transmitter, can forward an “overheard” version of the transmitted signal. This virtual antenna array produces the desired diversity gain at the destination. Among the proposed re-forward strategies, the Amplify-and-Forward (AF), which involves a simple scale and retransmission of the received signal by the relay nodes, seems to give a good performance and complexity trade-off [6].

References

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