Optimal Distributed Power Allocation in Cognitive Radio Networks
Weiling Wu · Beijing Youdian Xueyuan xuebao · 2008
Spectrum sharing mechanism among distributed cognitive radio nodes is studied.Based on interference temperature model,the spectrum sharing problem is changed into a nonlinear power opti- mization problem.A distributed power allocation algorithm is proposed to maximize the network utility under multiple interference temperature limits.The presented algorithm solves the nonlinear optimiza- tion using primal-dual method with limited information exchange among cognitive radio nodes.Analy- sis and simulation show that the network utility is enhanced dramatically using the proposed algorithm.