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In this paper, the authors investigate the effectiveness of cooperative techniques in non-infrastructured ad hoc networks based on carrier sense access control. They point out, via analysis and detailed network simulations, that CSMA biases some fundamental statistics of geographical positioning of terminals available for cooperation. Not only may relay nodes refrain from cooperating due to the carrier sense mechanism, but also the spatial correlation of interference in the network is likely to compress potential cooperators within an area in the proximity of the source. Furthermore, their discussion highlights how issues that affect carrier sense based medium access strategies, such as hidden terminals, reduce the effectiveness of relaying strategies when implemented in large non-centralized networks.
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