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Cooperative spectrum sensing is an efficient solution to mitigate the primary hidden terminal problem through the involvement of the sensing result for cooperative users. Clustering is introduced to tackle the degradation in the performance of cooperative spectrum sensing caused by fading and shadowing of reporting channel, and also to reduce the control channel overhead when the number of cooperative...
Dynamic spectrum access in the form of cognitive radio (CR) has gained traction in wireless sensor networks (WSN) because of a) scarcity caused by the proliferation of wireless devices and service and b) it provides spectrum efficient communication for the resource constrained WSNs. However, proper means have to be devised to satisfy the requirements of both WSNs and CRs and to enjoy the benefits...
In this paper we investigate the fundamental performance limits of the cooperative sensing using energy detection by considering the unlimited number of sensing nodes. Although a lot of cognitive radio research so far proposed various uses of energy detection because of its simplicity, the performance limits of energy detection have not been well understood when a large number of sensing nodes exist...
As the advance of mobile devices, crowdsourcing has been successfully applied in many scenarios by employing distributed mobile devices to collectively monitor a diverse range of human activities and surrounding environment. Unfortunately, treating mobile devices as simple sensors that generate raw sensing data may lead to low efficiency because of excessive bandwidth occupation and additional computation...
In this paper, energy efficient power adaptation is considered in sensing-based spectrum sharing cognitive radio systems in which secondary users first perform channel sensing and then initiate data transmission with two power levels based on the sensing decisions (e.g., idle or busy). It is assumed that spectrum sensing is performed by the cognitive secondary users, albeit with possible errors. In...
Developing an efficient spectrum access policy enables cognitive radios to dramatically increase spectrum utilization while assuring predetermined quality of service levels for the primary users. In this abstract, modeling, performance evaluation, and optimization of a distributed secondary network with random sensing order policy are studied. Specifically, the secondary users create a random order...
This paper proposes a multi-objective optimization evolutionary algorithm for placement of roadside units (RSUs) in participatory sensing using vehicular networks. The proposed algorithm heuristically optimizes RSUs' communication coverage area in a city with the minimal number of RSUs. The extensive simulation results show the efficacy of the proposed algorithm comparing to a traditional placement...
Smartphones contain sensors that provide information about the user of the device. Studying smartphones, therefore, provides an invaluable window into the behavioral patterns of users. In this work, we describe an open infrastructure that provides research communities with principled access to mobile devices and their sensors. Our platform, the Sensibility Testbed, is a free, community-driven platform...
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