Power allocation for sensing based spectrum sharing cognitive radio network with multiple primary users [articol]

Abstract

In this paper, considering multiple primary users in a cognitive radio network, the problem of optimal power allocation strategy is studied to maximize the capacity of the secondary system. The primary users are each licensed to an adjacent narrowband channel and the secondary users simultaneously sense multiple narrow band channels and aggregate them for transmission. The sensing based spectrum sharing scheme where the secondary transmitter sense and then transmit is considered and the system model with multiple primary users is proposed. An algorithm using Lagrange dual decomposition method is proposed to solve the problem subject to average interference constraint and average transmit power constraint of secondary user. The optimization of power for maximizing the outage capacity is also studied and both are compared with opportunistic spectrum access scheme. Simulation results show that the proposed system maximizes the channel capacity of the secondary user of Cognitive network.