Journal of Beijing University of Posts and Telecommunications

  • EI核心期刊

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2008, Vol. 31 ›› Issue (5): 112-116.doi: 10.13190/jbupt.200805.112.335

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Optimal Distributed Power Allocation in Cognitive Radio Networks

LI Hong-yan, HE Zhi-qiang, NIU Kai, WU Wei-ling   

  1. Key Laboratory of Information Processing and Intelligent Technology,
    Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2008-02-26 Revised:1900-01-01 Online:2008-10-30 Published:2008-10-30
  • Contact: LI Hong-yan

Abstract:

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 optimization problem. A distributed power allocation algorithm is proposed to maximize the network utility under multiple interference temperature limits. The presented algorithm solves the nonlinear optimization using primal-dual method with limited information exchange among cognitive radio nodes. Analysis and simulation show that the network utility is enhanced dramatically using the proposed algorithm.

Key words: cognitive radio, interference temperature, power control, spectrum sharing

CLC Number: