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.
Conventional cooperative sensing scheme is a typical solution in cognitive radios for sensing and spectrum access under fading channel conditions and hidden node scenarios. The drawbacks of this scheme are its requirement of additional resources as well as the time delays involved in it. In this paper, we propose a mechanism for a single band structure, in which the two communicating secondary users...
In the secondary radio limited access (SR-LA) scheme, the secondary radio (SR) is limited to access parts of the frequency bins in order to obtain a tradeoff between the SR dropped probability and SR blocked probability. In this paper, we present the complete expressions of the balance equation and the blocked probability for the SR-LA scheme. Simulations and numerical analysis are conducted to verify...
A spectrum database is a radio propagation estimation tool for the spectrum sharing. Especially, measurement-based spectrum database (MSD) can achieve highly efficient spectrum sharing by utilizing statistics of the received power transmitted from a primary user (PU). However, the accuracy of the statistics deteriorates when local bias of the observation point in the square mesh or short range power...
In this paper, we propose a virtual full-duplex relay selection scheme in order to improve the achievable rate of secondary system in relay-assisted undelay cognitive radio (CR) networks. The proposed scheme first allocates transmit powers of transmitting nodes considering the interference constraint given by the primary system. Then, the best transmitting and receiving relay pair is selected based...
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.