The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Spectrum sensing is the important aspect of cognitive radio (CR). In order to use the vacant spectrum, cognitive radio user must be able to identify the presence of empty spectrum efficiently. A non-cooperative spectrum sensing faces the problem of shadowing and hidden terminal due to which the CR user fails to monitor the vacant spectrum. To solve the problem of hidden terminal and shadowing in non-cooperative...
In this letter, we study the cooperative energy-based combination for spectrum sensing in cognitive radio networks. Linear combination rule is investigated to minimize the probability of missed detection subject to an upper limit on the probability of false alarm. We propose a novel and practical linear combination rule, which only requires the mean and variance of the local test statistics. The performance...
In cognitive radio networks, multichannel spectrum sensing yield accurate results compared to single channel sensing schemes. However, often realistic correlation among multiple sensing channels is ignored. In this paper, we investigate the performance of a cognitive radio spectrum sensing systems considering more realistic exponential correlation among multiple sensing channels. Closed-form expressions...
In this paper, we propose a new cooperative spectrum sensing scheme for cooperative energy detection, named multi-selective scheme. The proposed cooperative sensing scheme is based on order statistics of the reporting links between the cooperative nodes and fusion center where the links with high signal-to-noise ratios (SNRs) are selected as reliable reporting links. The performance of the proposed...
Spectrum sensing is an important tool for the expansion of cognitive radio. This paper evaluates the use of statistical tests to optimize the spectral detection of available frequency bands for opportunistic occupation. Statistical characteristics of the transmitted signals over a channel subject to Rice fading are selected to achieve better cognitive sensing performance. More precisely, Jarque-Bera,...
In this paper, we study the impact of eigenvalue-based spectrum sensing techniques in the achievable throughput of the secondary cognitive radio network. For this analysis, the channel between the primary and secondary users is modeled as a complex Nakagami-m distribution, in order to investigate the effects of not only the channel envelope, but also the novel non-uniform phase distribution in the...
In a fading environment, a secondary user may opportunistically transmit with high power when its signal received by the primary receiver is deeply faded. The spectrum access gain can be obtained when there is perfect knowledge of channel sensing at both primary and secondary receivers. In this paper, we investigate the case of imperfect knowledge of channel sensing and explore the impacts on spectrum...
We analyze the outage for distributed estimation over orthogonal fading channels as a function of the number of sensors, K. We consider a scenario of fixed power per-sensor with an asymptotically large number of sensors. We characterize the scaling law of the outage and show that the outage decays faster than exponentially in the number of sensors and slower than exp(-K log K).
In spectrum-sensing cognitive radio, a local radio might fail to reliably and efficiently monitor the available spectrum holes. To combat the channel fading suffered by such a radio, a cognitive network of cooperative spectrum sensing users is employed. The spectrum sensing time duration should be minimized to maximize the capacity of cognitive radio network. In this paper, the twin effects of varying...
Cognitive radio (CR) is currently being seen as the future for wireless communications. Fundamental to the operation of a CR is the sensing of legacy communication. Energy detector (ED) is a simple and effective signal sensing method. However, the ED requires accurate estimation of the noise power. Any error in the estimation, which is common in practice, affects its performance. Communication signals...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.