Feasibility Investigation on Cognitive Radio Network Systems: Hearsay Algorithm
5 Pages Posted: 20 Apr 2018
Date Written: April 14, 2018
Abstract
In this paper Specifies, how effectively utilization of radio spectrum is important for accommodating the rapid growth of wireless communications. Cognitive Radio (CR) refers to a wireless architecture that enables dynamic spectrum access, where unlicensed devices are allowed to operate in temporally/spatially unused licensed channels. The main challenge for CR is a robust protection mechanism to guarantee an adequate Licensed Users (LU) system performance at all times. This requires a reliable spectrum sensing technique to accurately identify frequency opportunities; and an autonomous transmit power control algorithm that remains effective in severe fading environments. Cooperation among CR devices to assist the LU identification process is shown to be an imperative CR attribute for maximising the CR performance and the overall spectral utilisation The Hearsay Algorithm is a novel Transmit Power Control algorithm for CRs in a cooperative network. Each node seeking to transmit is informed of the status of the LU channel by a chain of other CR nodes, hence the term “Hearsay”.
Keywords: Cognitive radio; Adaptive Radio; Hearsay Algorithm; Transmit Power Control Algorithm; Cooperative Network; Radio Channel Detection; Dynamic Spectrum Access.
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