Open AccessSelection relaying in decode‐and‐forward multi‐hop cognitive radio systems using energy detection
Author(s) -
Goel Dhanesh,
Sai Krishna Vemuri,
Bhatnagar Manav
Publication year - 2016
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2015.0209
Subject(s) - cognitive radio , computer science , hop (telecommunications) , selection (genetic algorithm) , telecommunications , computer network , wireless , artificial intelligence
In this study, the authors have analysed the performance of selection relaying at each hop in a decode‐and‐forward (DF)‐based multi‐hop cognitive radio (CR) system deploying cooperative spectrum sensing. The decisions on spectrum availability are taken by a number of sensing CRs (SCRs) at the first level and are sent to a fusion centre (FC) over pre‐existing clusters of relaying CRs (RCRs). The RCRs are being used in a secondary role for relaying the spectrum decision besides sensing their own area primary user. The decision of each SCR is relayed to FC one‐by‐one via number of RCR clusters by selecting a maximum signal‐to‐noise ratio link at each cluster independently. The selected RCR forwards the decision to the next level using DF protocol. The closed‐form expressions for probability of missed detection and false alarm are derived at the FC. An optimal combining rule is devised at the FC. A comparative graphical analysis of power saving in case of multi‐hop transmission to that of single‐hop transmission is also presented. The number of hops for the considered system is optimised based on a trade‐off relation between error rate and transmission delay.