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On the Performance of Opportunistic Relay Selection in Cognitive Radio Networks with Primary User’s Interference and Direct Channel

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Abstract

This paper analyzes outage performance of opportunistic relay selection in cognitive radio networks with primary user’s interference and direct channel over independent non-identically distributed fading channels and under maximum transmit power constraint and interference power constraint. Exact analysis is firstly proposed and then extended to asymptotic analysis to have insights into important performance metrics such as coding gain and diversity order. The proposed analysis can also be applied to corresponding analysis for opportunistic relay selection in cognitive radio networks with PU’s interference and without direct channel to highlight the usefulness of direct channel in relaying communications without any sacrifice of power and bandwidth. A multitude of results illustrate an achievable full diversity order, a considerable system performance deterioration due to primary user’s interference but this deterioration can be drastically remedied by increasing the number of involved relays, and the superiority of opportunistic relay selection with direct channel to that without it.

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Notes

  1. This paper focuses on the DF relays in cooperative cognitive networks and hence, relay selection schemes with the AF relays (e.g., [23–28]) or in dual-hop cognitive networks (e.g., [29–32]) are not necessarily surveyed.

  2. As will be shown in the next section, both PU’s interference and direct channel induce received SINRs to be correlated, making the analysis more complicated but more general and practical.

  3. That means that \(\lambda _{pq}\)’s are partitioned into groups of equal value. For instance, \(\lambda _{sk}\)’s, \(\lambda _{kd}\)’s, \(\lambda _{kr}\)’s, \(\lambda _{tk}\)’s with \(k\in {\mathcal {R}}\) are assumed to be equal in [9–11, 13, 18, 31, 40–43].

  4. That means that \(\lambda _{pq}\)’s, \(\forall \{p,q\}\) are equal in [14, 16, 19, 33].

  5. \(\mathcal {R}[j]\) denotes the jth element of the set \(\mathcal {R}\).

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Acknowledgments

This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) Under Grant Number 102.04-2014.42

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Authors and Affiliations

  1. Department of Telecommunications Engineering, HoChiMinh City University of Technology, 268 Ly Thuong Kiet Str., District 10, HoChiMinh City, Vietnam

    Khuong Ho-Van, Son Vo-Que & Tra Luu-Thanh

  2. Department of Computer and Communication Engineering, HoChiMinh City University of Education Technology, 1 Vo Van Ngan Str., Thu Duc District, HoChiMinh City, Vietnam

    Lien Pham-Hong

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  1. Khuong Ho-Van
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Correspondence to Khuong Ho-Van.

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Ho-Van, K., Pham-Hong, L., Vo-Que, S. et al. On the Performance of Opportunistic Relay Selection in Cognitive Radio Networks with Primary User’s Interference and Direct Channel. Wireless Pers Commun 91, 345–367 (2016). https://doi.org/10.1007/s11277-016-3464-9

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