Exact outage analysis of modified partial relay selection in cooperative cognitive networks under channel estimation errors

• Published in: IET communications Vol. 10; no. 2; pp. 219 - 226
• Main Author: Ho-Van, Khuong
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 21.01.2016
• Subjects: asymptotic outage analysis; Asymptotic properties; channel estimation; channel estimation errors; Channels; cognitive radio; cooperative cognitive networks; cooperative communication; dual‐hop cognitive networks; Error analysis; error propagation prevention; exact outage analysis; Fading; fading channels; independent fading distributions; interference power constraint; maximum transmit power constraint; modified partial relay selection; Networks; nonidentical fading distributions; Outages; radiofrequency interference; Relay; relay networks (telecommunication); Relaying; relaying communications; system performance assessment; wireless channels; interference power constraint; exact outage analysis; system performance assessment; error propagation prevention; cooperative cognitive networks; cooperative communication; independent fading distributions; radiofrequency interference; cognitive radio; fading channels; channel estimation; nonidentical fading distributions; modified partial relay selection; relaying communications; channel estimation errors; asymptotic outage analysis; dual-hop cognitive networks; maximum transmit power constraint; wireless channels; relay networks (telecommunication)
• ISSN: 1751-8628; 1751-8636; 1751-8636
• DOI: 10.1049/iet-com.2015.0145

This study first modifies the traditional partial relay selection in cooperative cognitive networks to prevent error propagation and then proposes exact and asymptotic outage analysis for the modified partial relay selection under practical operation conditions such as channel estimation errors (CEEs) on all wireless channels, independent and non-identical fading distributions, interference power constraint, and maximum transmit power constraint. The proposed analysis is useful in assessing system performance in important parameters as well as providing insights into performance limits without exhaustive simulations. Moreover, in order to quantitatively evaluate the performance gain of utilising the direct channel between the source and the destination in relaying communications, the authors extend their proposed analysis to dual-hop cognitive networks. Illustrative results demonstrate that CEEs and outage threshold significantly degrade system performance, and the direct channel dramatically contributes to performance improvement of relaying communications.