Power allocation in cognitive radio networks with cooperative spectrum sensing

This paper studies power allocation among cooperative nodes (CNs) and secondary user (SU) under the assumption that only mean channel gains are available. We aim to find the power allocation that maximizes the SU average throughput under the constraints of the total power and individual transmission power for CN. We also consider the requirement on cooperative spectrum sensing with target miss-detection probability. Due to the high computational complexity of the optimal solution, we derive a near-optimal solution with low complexity while satisfying the requirements on transmission power and miss-detection probability. Moreover, the closed-form expression of approximation of power ratio is presented. Finally, numerical results verify our analysis and show that the proposed scheme achieves significant performance gain over others, and closes to the optimal solution.