Power Allocation for Cognitive OFDM Radio Networks under Primary User's Outage Probability Constraint

doi:10.13190/jbupt.201001.120.223

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2010, Vol. 33 ›› Issue (1): 120-123.doi: 10.13190/jbupt.201001.120.223

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Power Allocation for Cognitive OFDM Radio Networks under Primary User's Outage Probability Constraint

TANG Lun^{1, 2};WANG Huan²;CHEN Qian-bin²;ZENG Xiao-ping¹

(1.College of Communication Engineering, Chongqing University, Chongqing 400044, China; 2.Key Laboratory of Mobile Communication Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China)

Received:2009-09-04 Revised:2009-11-19 Online:2010-02-28 Published:2010-02-28
Contact: TANG Lun

Abstract

Abstract:

The optimal power allocation strategy of cognitive orthogonal frequency division multiplexing (OFDM) system is studied. In order to limit primary user’s outage probability, the optimization is formulated maximizing the capacity of cognitive user under the constraint of outage probability at the primary receiver, and the optimal solution to the problem is obtained by utilizing the Lagrange method. Simulation shows that this scheme can efficiently limit primary user’s outage probability to its tolerable range while maximizing secondary user’s transmission rate.

Key words: cognitive radio, orthogonal frequency division multiplexing, power allocation, convex optimization

TANG Lun^{1, 2};WANG Huan²;CHEN Qian-bin²;ZENG Xiao-ping¹. Power Allocation for Cognitive OFDM Radio Networks under Primary User's Outage Probability Constraint[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2010, 33(1): 120-123.

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Power Allocation for Cognitive OFDM Radio Networks under Primary User's Outage Probability Constraint

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