Distributed Power Control Algorithm Considering Node Data Delay in Cognitive Radio Networks
NI Wei-ming · Fudan xuebao. Ziran Kexue ban · 2011
The distributed power control problem in cognitive radio network is studied.A strategy that based on each node local estimation and information exchange is proposed to keep the interference to primary user lower than pre-determined threshold without any central control nodes or assistant sensors.The optimal objective is to minimize the node transmission power under the data delay constraint and power control is proved to be a convex optimization problem.Based on Lagrange dual decomposition theory,a subgradient distributed iteration algorithm is constructed and the convergence of the distributed algorithm is proved.The simulation results show that the distributed algorithm can converge to the optimal solutions very fast.