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Effective capacity and outage probability assessment of multiple‐relay cognitive communication systems in Nakagami‐m and Rayleigh fading channel
Author(s) -
Zahedi Abdulhamid,
Ergen Mustafa,
Ergen Onur,
Shayea Ibraheem,
ElSaleh Ayman A.
Publication year - 2020
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.3841
Subject(s) - underlay , cognitive radio , nakagami distribution , computer science , rayleigh fading , computer network , fading , relay , channel (broadcasting) , quality of service , overlay , spectrum management , transmission (telecommunications) , wireless , signal to noise ratio (imaging) , telecommunications , power (physics) , physics , quantum mechanics , programming language
The radio spectrum of communication systems is largely occupied by wideband technologies, and thus, efficient usage of spectrum is a crucial requirement from regulators' and service providers' perspectives. Cognitive communication has been proposed as a potential solution to resolve the spectrum scarcity problem. Cognitive radio schemes can be jointly applied with cooperative communications to improve the performance under both overlay and underlay strategies as the two main cognitive strategies supported by multiple relays. This combination significantly improves the reliability and capacity of data communication. In this paper, two QoS parameters, namely, the effective capacity and outage probability, have been thoroughly analyzed in a Nakagami‐m fading channel that is the typical channel condition often considered in the transmission of communication systems. Closed‐form expressions are obtained for effective capacity and outage probability in both underlay and overlay strategies. Simulation results verify the effectiveness of the mathematical modelling of the proposed QoS parameters.