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.
This paper investigates joint relay selection (RS) and power allocation (PA) in cognitive radio (CR) systems, in which relay nodes operate in amplify-and-forward (AF) mode. In contrast to the conventional schemes, we take into account the performance of the secondary user (SU) which acts as the relay. A two-step optimization scheme is proposed to maximize system throughput with minimum rate guarantees...
In this paper, we consider the problem of hierarchical bandwidth sharing in cognitive radio (CR) environment. In the system model under consideration, a primary service provider (PSP) can sell its available spectrum bandwidth to a secondary service provider (SSP). In contrast to the conventional schemes, the SUs served by the SSP can also share the unsold bands of the PSP through the approach of opportunistic...
The low spectrum utilization has limited the development of wireless communication is a common view In Cognitive Radio (CR). And the idle spectrum holes are too narrow to support high-speed communication is an another problem. The spectrum aggregation technology is supposed a hopeful method for the secondary users (SU) access to the idle spectrum. In order to improve the spectrum utilization, a spectrum...
The cognitive making decision engine plays an important role in cognitive radio. In this paper, a novel cognitive making decision engine based on binary chaotic particle swarm optimization (BCPSO) is proposed to adjust the transmitter parameters appropriately. The obtained results in the orthogonal frequency division multiplexing (OFDM) system are compared with those of binary particle swarm optimization...
In cognitive radio network, multiple primary service providers compete with each other to offer spectrum access opportunities to the secondary users and obtain the economic benefits. According to the problem of spectrum pricing for primary users in cognitive radio network, a novel spectrum pricing algorithm based on static Bertrand game theory is proposed in this paper. Not only does this algorithm...
In this paper, we consider the problem of joint relay selection and power allocation in a cognitive radio (CR) network, where a secondary user (SU) source communicates with a secondary access point (AP) assisted by a set of SU relays. Each SU in this set not only acts as a potential relay but also has its own data transmission requirement. Keeping the interference to the primary user (PU) below a...
The frequency resource of mobile communication systems is intensive and it needs to combine with cognitive radio technology. The mobile telecommunication system subscribers are sensitive to interference, making the interference problem need prompt solution. This paper analyzes the inter-system and intra-system interference and proposes the approach of utilizing spectrum holes classification. The spectrum...
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.