DocumentCode :
64328
Title :
Distributed Power Control With Robust Protection for PUs in Cognitive Radio Networks
Author :
Shimin Gong ; Ping Wang ; Lingjie Duan
Author_Institution :
Sch. of Comput. Eng., Nanyang Technol. Univ., Singapore, Singapore
Volume :
14
Issue :
6
fYear :
2015
fDate :
Jun-15
Firstpage :
3247
Lastpage :
3258
Abstract :
In cognitive radio networks, it is challenging for secondary users (SUs) to estimate and control their interference at the receivers of primary users (PUs), due to incomplete or erroneous channel information between SUs and PUs. Thus, SUs need to estimate the worst-case aggregate interference at PU receivers to ensure guaranteed protection for PUs from excessive interference. As it is rare that all SU-PU channels experience the worst-case conditions simultaneously, we propose a practical model (namely, the worst-case selective robust model) for SUs to estimate their aggregate interference power. This model employs an adjustable parameter to control the number of SU-PU channels that are in the worst-case conditions. For an individual SU-PU channel, the estimation of worst-case channel gain is subject to a distribution uncertainty. Given this robust model, we study SUs´ power control problem in a non-cooperative game where each SU selfishly maximizes its own throughput performance subject to coupled interference constraints at PU receivers. We study the existence and uniqueness of Nash equilibrium and propose an iterative algorithm for SUs to achieve the equilibrium in a distributed manner. Numerical results show that our algorithm provides guaranteed protection for PUs and fair throughput performance for SUs, provided with uncertain SU-PU channel information.
Keywords :
cognitive radio; iterative methods; radio receivers; radiofrequency interference; PU receivers; channel information; cognitive radio networks; distributed power control; interference constraints; interference power; iterative algorithm; noncooperative game; primary users; receivers; robust protection; secondary users; worst case channel gain; Aggregates; Channel estimation; Interference; Power control; Receivers; Robustness; Uncertainty; Cognitive radio; distribution uncertainty; game theory; power control; robust optimization;
fLanguage :
English
Journal_Title :
Wireless Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-1276
Type :
jour
DOI :
10.1109/TWC.2015.2403357
Filename :
7041194
Link To Document :
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