An Efficient Transmit Power and Bit Rate Allocation Algorithm for OFDM Based Cognitive Radio Systems

Yuehuai MA
Youyun XU
Jin-Long WANG

IEICE TRANSACTIONS on Communications   Vol.E94-B    No.1    pp.302-306
Publication Date: 2011/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.302
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Network
cognitive radio,  OFDM,  transmit power and bit rate allocation,  convex optimization,  

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We consider the problem of transmit power and bit rate allocation for OFDM based cognitive radio systems. An efficient allocation algorithm which mainly consists of two steps is proposed to maximize the sum rate of secondary users. In the first step of the algorithm, original nonlinear problem is converted to a convex problem which is solved by dual methods, and in the second step the final resource allocation results is obtained via iterative power rescale operation. Numerical results show the effectiveness of the proposed algorithm.