Abstract
Rapid growth in demand for spectrum resources and technology expansion in wireless communication systems such as satellite communication networks and upcoming 5G networks has led us to investigate the best cognitive radio network scheme towards achievements of energy efficiency in wireless communication networks for cooperative spectrum sensing. In this paper, we introduce a double-deck cluster cooperative relay assistance model in hybrid spectrum sharing for cognitive radio networks. This proposed model enables the attainment of energy efficiency by optimizing cooperative secondary users in their respective cluster groups. According to the design of this model, we apply the power allocation scheme under mathematical analysis based on its power constraints. Normalized energy consumptions and amplifying gains are achieved and assessed for both network scenarios when cognitive relays are used and not used in the network. Simulation results show that there is a good performance on the energy efficiency of our proposed scheme compared to a traditional scheme.
Highlights
The rapid development and timely technological advancement in wireless communication services have led to a fast increase in demand for spectrum resources by both secondary users (SUs) and primary users (PUs) [1]
SUs cooperate into cluster groups having uniform transmission distances from sensing nodes to the cluster heads (CHs) of the same cluster group, whereas each cluster group is assumed to be far or close from CHs to the central cluster head (CCH) with a respective periodic time, cognitive relays are used to AF the weak signal to the CCH, where local decisions of all cooperating cluster groups (CCG) are collected to be propagated to the FC through a single cooperative relay assistance (CRA) relay channel
Less sensing time leads to low detection probability and high false alarm probability, whereas too much sensing time may lead to high levels of both interferences and energy consumption, which may affect the global energy efficiency of the proposed scheme
Summary
The rapid development and timely technological advancement in wireless communication services have led to a fast increase in demand for spectrum resources by both secondary users (SUs) and primary users (PUs) [1]. In [14], authors have proposed a spectrum mapping scheme in SS under kennels function based on vector machine adoption to enhance performance accuracy by using filtration and accuracy threshold In all these works, the basic aim is not based on cooperating cluster groups (CCG) of CRs under double decking relay assistance (DDRA) with a target to reduce EC in CRNs at the same time maintaining the detection accuracy of the spectrum status. These disadvantages led us to come with novel contributions of our paper which rely on the design of a DDRA model on cluster CSS in HSS strategy under the power allocation scheme, optimal energy consumption (OEC), and reliable throughput. Where n(t) is zero-mean additive white Gaussian noise (AWGN), y(t) is the sample signal sensed by SUs during the SS period, yi(t) is the primary user signal, whereas, H0 and H1 are the hypotheses test for PUs absent and present
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