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For CR systems, where primary and CR users coexist in adjacent bands, it is important to keep the interference introduced to the Primary User (PU) band within a tolerable range. In this paper, the authors investigate the subcarrier and power allocation problem in CR systems, where primary and CR users co-exist in adjacent bands, while keeping the total interference introduced to the PU band below a certain threshold and the total power allocated to the CR users under a constraint. First, according to the different purposes of the resource allocation, several suboptimal subcarrier allocation algorithms are investigated, which are termed as max-rate, min-interference and fair-rate subcarrier allocation algorithm, separately.
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