A robust power control algorithm with priority of energy efficiency based on cognitive radio is proposed to solve the problem that the performance of traditional power control algorithms based on ideal channel perception is degraded due to channel perception errors in satellite networks. The uncertainty of distance perception in a satellite network is firstly considered. A cognitive power control model is then established by analyzing the distance dependent path loss derived from the related channel gain distribution and shadow effect
so that the power control problem is transformed into an optimization problem with constraint conditions. Probability constraints are introduced and the cognitive user optimal power control is realized by using the fractional programming and Lagrange duality theory. Simulation results show that the algorithm has a faster convergence rate and lower complexity. Compared with the power control algorithm without energy efficiency first
the network energy efficiency can be improved by 50% at most in the case of perception error.
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