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This work presents joint subcarrier, power and bit allocation schemes formulti-user OFDM based overlay cognitive radio under constraints on primary userthroughput loss and total secondary user transmitted power. Closed form forexpressions for the optimal power and bit allocations are initially derived.Subsequently, optimal and suboptimal algorithms to realise the jointsubcarrier, power and bit allocations are introduced. Numerical simulations areused to evaluate the performance of the joint resource allocation algorithms.

Joint Resource Allocation for OFDMA based Overlay Cognitive Radio Networks under Stochastic Rate Constraint