Performance analysis of cognitive relay networks with imperfect channel knowledge over Nakagami-m fading channels

Author

Jia Xing ; Xing Zhang ; Jiewu Wang ; Zhenhai Zhang ; Wenbo Wang

Author_Institution

Key Lab. of Universal Wireless Commun., Wireless Signal Process. & Network Lab., Beijing Univ. of Posts & Telecommun., Beijing, China

fYear

2014

fDate

6-9 April 2014

Firstpage

839

Lastpage

844

Abstract

In underlay cognitive radio networks, imperfect channel knowledge will have an adverse effect on the performance of both the primary users (PU) and the secondary users (SU) owing to the interference power constraint of PU. This paper investigates the performance of a cognitive relay network (CRN) with imperfect channel state information (CSI) of the interference links over Nakagami-m fading channels. Interference probability is defined to characterize the interference caused by SU to PU due to CSI imperfection. Closed-form expressions for both the interference probability of the primary user and the outage probability of the secondary system are derived and validated by simulations. It is proved that the interference probability of the primary user is always 0.5 under the condition of imperfect CSI when no power control mechanism is adopted. The effects of CSI imperfection, channel fading severity, interference probability of PU and transmit power of PU on the outage performance of the secondary system are also analyzed.

Keywords

Nakagami channels; cognitive radio; interference (signal); probability; relay networks (telecommunication); CRN; CSI imperfection; Nakagami-m fading channels; PU; SU; closed-form expressions; cognitive radio networks; cognitive relay networks; imperfect channel knowledge; imperfect channel state information; interference link probability; interference power constraint; outage probability; performance analysis; power control mechanism; primary users; secondary users; Cognitive radio; Interference constraints; Power control; Rayleigh channels; Relay networks (telecommunications);

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications and Networking Conference (WCNC), 2014 IEEE

Conference_Location

Istanbul

Type

conf

DOI

10.1109/WCNC.2014.6952197

Filename

6952197