Cluster‐based spectrum access scheme selection and optimal relay link selection for hybrid overlay/underlay cognitive radio networks

Abstract

Cognitive radio (CR) network is the effective technique for the optimum utilization of the spectrum. The hybrid cognitive network (HCN) has been implemented to increase the utilization of the spectrum, by using both (overlay/underlay) modes of spectrum sharing. In overlay mode, cognitive radio (CR) opportunistically uses the spectrum, whereas in underlay mode, the CR uses the spectrum simultaneously with primary user (PU) with transmit power limitation. The HCN tries to use advantages of both modes of spectrum sharing. Its performance is based on the accuracy of the method used to find the PU status. Hence, in this paper, "clustering-based spectrum access scheme selection and optimal relay link selection for hybrid overlay/underlay cognitive radio networks" have been proposed to improve the performance of the hybrid cognitive radio network. In this proposed method, the scheme selection is done in two levels. In the first level, spectrum sharing scheme is selected based on the cluster in which the SU is present, and in the second level, scheme is selected based on the PU status. The cluster-based cooperative spectrum sensing method has been used to find the status of the PU. Compared with cooperative spectrum sensing, a cluster-based cooperative spectrum sensing has a huge effect on sensing accuracy. While the underlay scheme is used by SU, best relay link has been selected by using particle swarm optimization technique. Thus, the best scheme selection and relay selection improve the performance of hybrid cognitive radio network. The simulation result shows that the proposed method improves the throughput of the HCN.

CapsNet‐based computing in cognitive communications

“…The topics included in this issue include: “Efficient Workflow Scheduling in Cloud Computing for Security Maintenance of Sensitive Data”—Authored by S , Shahul Hammed; B ., Arunkumar : This research work [3] proposes an efficient method for managing the workflow by considering the value of the information and categorizing between the much value and nonvalue information and framing the algorithm that functions as scheduler by using the parallel implementation in natural process of genetic algorithm (GA) by proposing a secured framework for the high value of information. “Low Power and Area Efficient Design of AES S‐Box Using Enhanced Transformation Method for Security Application”—Authored by V , Nandan; R ., Gowri Shankar Rao: This research work [4] implements a well‐known advanced encryption standard (AES) algorithm, and further, the main part for constructing the hardware is S‐Box, which is abbreviated from substitution box. This S‐Box is designed by two transformations, that is, inversing the multiplication part in Galois field directed with modified affine transformation. “Cluster Based Spectrum‐Access Scheme Selection and Optimal relay link selection for Hybrid Overlay/Underlay Cognitive Radio Networks”—Authored by Rajappan , Rajaganapathi; P , Muthuchidambaranathan: This research work [5] has implemented a hybrid cognitive network (HCN) to increase the utilization of the spectrum, by using both (overlay/underlay) modes of spectrum sharing. In overlay mode, cognitive radio (CR) opportunistically uses the spectrum, whereas in underlay mode, the CR uses the spectrum simultaneously with primary user (PU) with transmit power limitation to improve the performance of the hybrid CR network. “Coding Structure of JMVDC along Saliency Mapping: A Perspective Compression Technique”—Authored by Veena , Manasa; Narayana , Satya; Prasad , Giri: This research work [6] proposes a novel saliency show for stereoscopic pictures.…”

Design and Development of Hybrid Spectrum Access Technique for CR-IoT Network

“…Various research papers have already been written on the hybrid spectrum access technique, covering it from a variety of methods and perspectives. A portion of these works is reviewed here [11][12][13][14][15]. The success of the hybrid spectrum scheme heavily depends on its ability to accurately detect the presence or absence of a PU.…”

A smart spectrum utilization approach using multiantenna‐based cognitive relays in cognitive radio network

“…A classical idea of using cluster-based spectrum sensing and access techniques under hybrid overlay/underlay CR network through optimal relay selection scheme has been proposed Rajaganapathi and Nathan. 15 Authors previous studies 16,17 give a fantastic explanation on proactive and reactive DF relaying schemes. 18,19 A brief DF relaying schemes were also described in Zhong et al 20 Optimal power allocation algorithm has been developed for a hybrid underlay/overlay OFDM-based CR network in previous studies.…”

“…Blasco‐Serrano et al 14 have compared the system throughput using a learning phase in a secondary network for both underlay and overlay models. A classical idea of using cluster‐based spectrum sensing and access techniques under hybrid overlay/underlay CR network through optimal relay selection scheme has been proposed Rajaganapathi and Nathan 15 . Authors previous studies 16,17 give a fantastic explanation on proactive and reactive DF relaying schemes 18,19 .…”