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.
Cognitive radio emerges as a promising technology to improve the utilization of the allocated spectrum. In a cognitive radio network, secondary users (SUs) need to sense the spectrum to obtain currently available channels and have to vacate the occupied channels when primary users (PUs) return. In cognitive radio networks, establishing a link through a common available channel is defined as the rendezvous...
Ad-hoc networks are promising complements for the infrastructure based network under disastrous scenarios. However, due to the heterogeneous surrounding environment of each user, the channel availability of each user may be quite different. Cognitive radio emerges as a promising technology to enable two users to communicate under different channel availability, by opportunistically accessing available...
Cognitive radio emerges as a promising technology to improve the utilization of the allocated spectrum. In a cognitive radio network, secondary users (SUs) need to sense the spectrum to obtain currently available channels and have to vacate the occupied channels when primary users (PUs) return. In cognitive radio networks, establishing a communication link between two SUs through a common available...
Cognitive radio is a promising technology to solve the spectrum scarcity problem. In a cognitive radio network, a secondary user (SU) first senses a specific range of the spectrum to get its available channels and two SUs need to rendezvous on a common available channel to establish a physical link for communications. The spectrum band allocated for existing wireless services is very wide. However,...
Cognitive radio is a promising technology that can improve the utilization of the spectrum. In a cognitive radio ad-hoc network (CRAHN), a secondary user (SU) has to get its available channels by sensing the spectrum, and two SUs should rendezvous on a common available channel to realize communications. Therefore, the number of the common available channels is an important factor for a SU pair. However,...
This paper considers the network situation where the primary users (PUs) in a cognitive radio network have leased out the idled spectrum to the secondary users (SUs) via pricing-based dynamic spectrum allocations (DSAs). We take into account that a SU can serve as a cooperative relay for a PU, and, then, stimulate the PU to split more spectrum while maintaining the minimum transmission rate of the...
Proposed by Joseph Mitola III in 1999, Cognitive Radio (CR) has been considered as a promising solution for intelligent and efficient utilization of scarce spectrum in the communication world. CR brings about flexibility and self-adaptability to networks, by deploying most of functions on software. As the future communication era enables efficient utilization of radio resource, shrewd management of...
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.