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Subcarrier assignment is of crucial importance in wideband cognitive radio(CR) networks. In order to tackle the challenge that the traditionaloptimization-based methods are inappropriate in the dynamic spectrum accessenvironment, an independent Q-learning-based scheme is proposed for the casethat the secondary users (SUs) cannot exchange information while acollaborative Q-learning-based scheme is proposed for the case that informationcan be exchange among SUs. Simulation results show that the performanceachieved with the proposed collaborative Q-learning-based assignment is betterthan that obtained with the proposed independent Q-learning-based assignment atthe cost of the computation cost.

Subcarrier Assignment Schemes Based on Q-Learning in Wideband Cognitive Radio Networks