An Efficient Resource Allocation Scheme for OFDMA-Based Cooperative Cognitive Radio Networks with Minimum Power Constraint

A novel resource allocation algorithm for OFDMA-based cooperative cognitive radio network is proposed. Sum-capacity of Primary Users (PUs) is maximized under minimum power constraint. We design a sub-optimum algorithm with low complexity. In this manner, though sum-capacity does not change significantly, Outage probability of systems decrease considerably. The algorithm is also modified to improve active PUs in the network. Difference between optimum and sub-optimum schemes is shown to be negligible in simulation results. These algorithms aim to increase subcarriers of secondary users.