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Several spectrum access/sharing algorithms for Cognitive Radio Networks (CRNs) have been designed assuming no adjacent-channel interference (i.e., no interference from neighboring CR transmissions operating over adjacent channels). However, in practice, such an assumption may not hold, and guard bands are realistically needed to prevent interference from neighboring CR transmissions operating on adjacent channels. Introducing guard bands is a restrictive constraint on the effective use of the spectrum. In this paper, the authors investigate the problem of assigning channels/powers to CR transmissions, while accounting for such a constraint. To improve spectrum efficiency and avoid unnecessary blocking of CR transmissions, they propose a novel guard-band-aware channel assignment scheme.
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