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Geometric progression algorithm for adjacent band power allocation in OFDM based cognitive radio

This paper presents a novel and efficient algorithm for allocating the power resources in the adjacent and nearby sub-channels of a cognitive radio system based orthogonal frequency division multiplexing (OFDM). The new algorithm was created by analyzing the behaviors of the relationship between interference and spectral distance of the secondary user (SU) sub-carriers and the primary user (PU) band which is approximated to a geometric proportion. We implement this algorithm in an OFDM system taking the advantage of sub-carriers allocation. The conventional water-filling algorithm is loaded and furthers our new effective and dynamic algorithm is implemented in a certain group of adjacent and nearby sub-carriers to ensure the minimization of both sided adjacent interference. The results show that the performance of our proposed algorithm is better than the other in which the adjacent sub-carriers are deactivated.