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Cognitive radio applications are limited by the scarcity of available frequency bands for telecommunication services. The improvement of the spectrum sensing to enable a better sharing of the frequency spectrum among different users is a major challenge in wireless communications based on cognitive radio. This paper evaluates the use of statistic tests to optimize the non-cooperative cognitive spectrum...
In this article, we develop an analytical framework for performance evaluation and comparison between decision and data fusion rules for cooperative relay based cognitive radio networks. Our unified analytical formulas for the data fusion rules are sufficiently general to tackle generalized stochastic channel models with independent but non-identically distributed (i.n.d) link statistics. We also...
Cognitive radio (CR) is a promising technology for future wireless networks. In order to reduce the interference to primary system, CR users have to detect the spectra with low overhead and reliably in sensing slots, which has to occupy part of the available resources. In this paper, we propose a novel spectrum sensing solution that is based on cooperative wireless sensors to detect and collect available...
This paper investigates a cooperative spectrum sensing to implement the spectrum sharing system. In the cooperative sensing, observations of multiple secondary users (SUs) are used to detect presence of PS. There are two approaches in cooperative sensing. The first approach is non-weighted cooperative sensing (NWCS). The second approach is a weighted cooperative sensing (WCS) where the weight is used...
Cognitive radio has been proposed recently as the means to improve spectrum utilization, where the cognitive users (also referred to as secondary users) are permitted to share spectrum resource with the primary user. In this paper, we investigate the spectrum sensing by using cooperative diversity in multiple-user cognitive radio networks. A novel cooperative spectrum sensing scheme based on the best...
The present wireless communication system under coal mines is characterized by single pattern, fixed communication frequency, incapability of adaptive to various tunnel environments. To solve the above problems, cognitive radio (CR) is applied to the system. With the energy detection algorithms used in the spectrum sensing of various tunnels under mines, the spectrum sensing method adaptive to tunnel...
In a cognitive radio network, cooperative spectrum sensing is usually implemented to achieve higher detection accuracy than single user sensing. However, the performance of cooperative spectrum sensing is destructively impaired, when the reporting and inter-user channels both inevitably experience fading besides the detecting channel in reality. To solve this problem, we propose a robust scheme, called...
In this paper, we propose a cognitive radio-based multi-user resource allocation framework for mobile ad hoc networks using multi-carrier DS CDMA modulation over a frequency-selective fading channel. In particular, given pre-existing communications in the spectrum where the system is operating, in addition to potential narrow-band interference, a channel sensing and estimation mechanism is provided...
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