Abstract
The main challenge in operating cognitive ad-hoc networks is the lack of a centralized controller performing power allocation for different users in the network. In this paper, considering the power allocation optimization problem under both maximum transmit power at each cognitive transmitter and interference constraint at primary receiver, we propose a distributed power control and subcarrier allocation algorithm in cognitive radio networks by solving mixed-integer nonlinear programming problem. In order to solve this NP-hard problem, a two-phase mixed distributed control method requiring minimal cooperation between cognitive and primary users is used. Simulation results show that the proposed algorithm performs well in Rayleigh fading channel.
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