Performance Analysis of a Secondary User in Cognitive Radio over Generalized-Gamma Fading Channels

Year 2019, Volume: 19 Issue: 2, 166 - 172, 01.07.2019

Sultan Aldırmaz Çolak

Abstract

DOI: 10.26650/electrica.2019.19017

In this paper, the performance of a
secondary user (SU) in an underlay cognitive radio (CR) network over a
generalized-gamma (GG) fading channel in terms of three performance metrics,
namely, outage probability, ergodic capacity, and bit error rate (BER), is
investigated. According to the underlay approach, the transmit power of the SU
should be limited to avoid interference to primary users (PUs). The performance
metrics of the SU in the underlay CR network are theoretically derived and also
obtained with Monte Carlo simulations for a GG fading channel with different fading
parameters. To demonstrate the effect of limited power on the performance
metrics, three different maximum transmit power levels (Pmax), namely, 10, 20,
and 30 dB, are used. The simulation results lead to three conclusions: First,
when high values are chosen for the fading parameters (α, c), the fading
channel gets less distorted and the performance metrics improve. The second
conclusion is that the BER performance gets better as the limited power
increases. The final conclusion is that the BER performance of SUs improves as
the interference power that PUs can tolerate increases.

Cite this article as: Aldırmaz Çolak S.
Performance Analysis of a Secondary User in Cognitive Radio over
Generalized-Gamma Fading Channels. Electrica, 2019; 19(2): 166-172.

Keywords

Cognitive radio, generalized-gamma fading channel, underlay approach

References

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• Sultan Aldırmaz Çolak received the B.S degree in Electronics and Communications Engineering from Kocaeli University, Kocaeli 2004 and the M.S. and PhD degrees in Yildiz Technical University (YTU), Istanbul 2006 and 2012, respectively. She was a visiting research scholar in the Department of Electrical and Computer Engineering of University of South Florida for the spring and summer of 2009. She is currently an Assistant Professor in the Electronics and Communications Engineering Department of Kocaeli University, Kocaeli, Turkey. Her research interests are in time-frequency signal processing, and communications theory.