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Adaptive resource allocation and decoding strategy for underlay multi‐carrier cooperative cognitive radio systems
Author(s) -
Pischella Mylene,
Le Ruyet Didier
Publication year - 2013
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.2729
Subject(s) - underlay , cognitive radio , interference (communication) , computer science , subcarrier , decoding methods , resource allocation , channel (broadcasting) , single antenna interference cancellation , co channel interference , mathematical optimization , telecommunications , computer network , signal to noise ratio (imaging) , mathematics , orthogonal frequency division multiplexing , wireless
ABSTRACT This paper proposes a resource allocation and decoding strategy at the secondary system for underlay and interweave multi‐carrier cooperative cognitive radio. The objective is to maximise the sum rate of both primary and secondary systems, taking into account the interference threshold constraint and the fact that the primary receiver always considers interference as noise. The decoding method at the secondary receivers is either Successive Interference Cancellation or treating interference as noise, depending on their channel gains. The rationale for this strategy is the extension of the Han–Kobayashi capacity‐achieving strategy on the Gaussian interference channel to the studied cognitive scenario. The proposed resource allocation algorithm is composed of a subcarrier allocation procedure to avoid intercell interference between secondary cells and of an iterative power allocation algorithm that maximises the sum rate on the primary and secondary cells, respectively. The proposed algorithm achieves high data rate improvements for the secondary systems while maintaining a low degradation on the primary system's rate. It also benefits from multi‐user diversity and is robust to the distance variations. Copyright © 2013 John Wiley & Sons, Ltd.