Outage Analysis of Multi-Relay Selection for Cognitive Radio with Imperfect Spectrum Sensing
Yulong Zou, Jia Zhu, and Baoyu Zheng

TL;DR
This paper analyzes the outage performance of a cognitive relay network with multiple relays and imperfect spectrum sensing, proposing a multi-relay selection scheme that outperforms traditional methods in Rayleigh fading environments.
Contribution
It introduces a novel multi-relay selection scheme for cognitive radio networks and derives a closed-form outage probability expression considering imperfect spectrum sensing.
Findings
Multi-relay selection reduces outage probability compared to benchmarks.
Improved spectrum sensing enhances network reliability.
Proposed scheme outperforms direct and best-relay selection methods.
Abstract
In this paper, we examine the outage performance of a cognitive relay network, which is comprised of a secondary transmitter (ST), multiple decode-and-forward (DF) relays and a secondary destination (SD). We propose a multi-relay selection scheme for the cognitive relay network, where multiple relays are selected and used to participate in forwarding the secondary transmission from ST to SD. A closed-form expression of the outage probability for the proposed multi-relay selection under imperfect spectrum sensing is derived in Rayleigh fading environments. For comparison purposes, the conventional direct transmission and the best-relay selection are also considered as benchmarks. Numerical results show that as the spectrum sensing performance improves with an increasing detection probability and/or a decreasing false alarm probability, the outage probabilities of the proposed multi-relay…
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