In this paper, we focus on cooperative spectrum sensing (CSS) for double threshold improved energy detector. In this method, the improved energy detector compares positive power operation p of the amplitude of received signals at each secondary user (SU) with two thresholds to make binary decision about presence or absence of primary user (PU). The energies lying between upper and lower thresho...

It is imperative to address the problem of spectrum under usage and inefficiency because increasing demand slender resources. One salient functions cognitive radio sensing which used avoid interference unlice

In this paper, we consider the cooperative spectrum sensing problem in a cognitive radio (CR) mesh network, where secondary users (SUs) are self-organized into a IEEE 802.16 mesh network sharing the spectrum band allocated to a primary users’ (PUs) network. We propose two new cooperative spectrum sensing strategies, called amplify-and-relay (AR) and detect-andrelay (DR), aiming at improving the...

Cognitive Radio (CR) is an embryonic technology which able to increase the spectrum utilization by allowing the CR users to carry unused radio spectrum from primary licensed users or share the spectrum with the primary users without causing the inference by spectrum sensing method. This method is used for sensing the used spectrum, and we focus on the performance of CR users based on spectrum s...

Cognitive radios (CRs) have been recently emerging as prime candidates to enhance spectral efficiency by exploiting spectrum-aware systems which can reliably monitor licensed users’ activities. CR users monitor such activities by performing spectrum sensing to detect potential white spaces. However, this process of local sensing might be a challenging task in fading environments. The inefficien...

A vehicular network is expected to empower all aspects of the intelligent transportation system (ITS) and aim at improving road safety traffic efficiency. In view fact that spectrum scarcity becomes more severe owing increasing number connected vehicles, implying sensing technology in network, i.e., cognitive has emerged as a promising solution provide opportunistic usage licensed spectrum. How...

Cognitive radio is a transforming and revolutionary technology that represents a paradigm shift in the design of wireless systems, as it allows agile and efficient utilization of the radio spectrum by offering the ability of radio sensing, self-adaptation, and dynamic spectrum sharing. In this paper the use of cooperative spectrum sensing in cognitive radio systems to enhance the reliability of...