Relay-Selection Improves the Security-Reliability Trade-off in Cognitive Radio Systems
Yulong Zou, Benoit Champagne, Wei-Ping Zhu, and Lajos Hanzo

TL;DR
This paper investigates how relay selection strategies in cognitive radio networks can enhance the security-reliability trade-off, showing that multi-relay schemes outperform single-relay and direct transmission in resisting eavesdropping.
Contribution
It introduces and analyzes single-relay and multi-relay selection schemes for improving security and reliability in cognitive radio systems against eavesdropping.
Findings
Multi-relay selection outperforms single-relay in security-reliability trade-off.
Increasing the number of relays improves the security-reliability trade-off.
Multi-relay schemes achieve better performance than direct transmission.
Abstract
We consider a cognitive radio (CR) network consisting of a secondary transmitter (ST), a secondary destination (SD) and multiple secondary relays (SRs) in the presence of an eavesdropper. We rely on careful relay selection for protecting the ST-SD transmission against the eavesdropper with the aid of both single-relay and multi-relay selection. To be specific, only the "best" SR is chosen in the single-relay selection for assisting the secondary transmission, whereas the multi-relay selection invokes multiple SRs for simultaneously forwarding the ST's transmission to the SD. We analyze both the intercept probability and outage probability of the proposed single-relay and multi-relay selection schemes for the secondary transmission relying on realistic spectrum sensing. We also evaluate the performance of classic direct transmission and artificial noise based methods for the purpose of…
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