Abstract
Two novel algorithms are presented for subcarrier and power allocation in OFDMA-based cognitive radio (CR) networks. In one algorithm, a transmitted power mask is imposed on different subcarriers in order to limit the interference introduced in the primary network to a specified threshold. Following this step, the subcarrier allocation problem is formulated as a multiple knapsack problem (MKP), and a search algorithm is employed to maximize the sum capacity of the CR network. The second algorithm employs a heuristic approach by assigning different non-overlapping sets of OFDMA subcarriers to different CR users according to their channel conditions. This is followed by a power allocation algorithm that maximizes the sum capacity while maintaining the interference power introduced in the primary network band below a predefined threshold. The proposed algorithms show near-optimal performance while significantly reducing the complexity of the original allocation problem which is known to be NP-hard.
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Almalfouh, S.M., Stüber, G.L. (2009). Interference Aware Subcarrier and Power Allocation in OFDMA-Based Cognitive Radio Networks. In: Plass, S., Dammann, A., Kaiser, S., Fazel, K. (eds) Multi-Carrier Systems & Solutions 2009. Lecture Notes in Electrical Engineering, vol 41. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2530-2_4
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DOI: https://doi.org/10.1007/978-90-481-2530-2_4
Publisher Name: Springer, Dordrecht
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