Robust Power Control Under Location and Channel Uncertainty in Cognitive Radio Networks

Author

Jun Wang ; Jianshu Chen ; You Lu ; Gerla, Mario ; Cabric, Danijela

Author_Institution

Dept. of Electr. Eng., Univ. of California, Los Angeles, Los Angeles, CA, USA

Volume

4

Issue

2

fYear

2015

fDate

Apr-15

Firstpage

113

Lastpage

116

Abstract

In this letter, we consider the power control problem in cognitive radio (CR) networks when both primary user (PU) location and wireless channel are unknown. Prior work in power control assumes perfect knowledge of PU and CR locations, which is not practical due to localization errors and node mobility. We assume the distance estimation error in CR-PU links to model location uncertainties and derive the distribution of channel gain with distance-dependent path loss and shadowing. We then proceed to develop an optimization framework for CR power control, which maximizes the CR data rate under PU interference power constraint. Simulation results showing the CR data rate and interference probability to the PUs are presented to demonstrate the superior performance of the proposed algorithm compared with reference schemes.

Keywords

cognitive radio; optimisation; probability; wireless channels; CR-PU links; channel gain; cognitive radio networks; distance estimation error; interference power constraint; optimization framework; primary user; robust power control problem; wireless channel; Power control; channel uncertainty; cognitive radio networks; location estimation error;

fLanguage

English

Journal_Title

Wireless Communications Letters, IEEE

Publisher

ieee

ISSN

2162-2337

Type

jour

DOI

10.1109/LWC.2014.2377129

Filename

6975102