Optimal Power Allocation of Cognitive Radio with Incomplete Channel State Information

Luxi LU  Wei JIANG  Haige XIANG  Wu LUO  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.5   pp.1502-1505
Publication Date: 2011/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.1502
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
cognitive radio,  interference power constraint,  power allocation,  

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We propose optimal power allocation schemes for a secondary cognitive user sharing spectrum with a primary user under different interference power constraints in Rayleigh fading channels. Specifically, we consider a practical scenario in which the secondary user has a fixed transmission rate and the instantaneous channel state of the interference channel is not available to the secondary user. Simulation results verify the feasibility of the proposed schemes and evaluate the effective transmission rate loss due to the incomplete channel state information.