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.
Existing spectrum management policies have led to significant over-allocation and under-utilization of the licensed spectrum. To overcome this, cognitive radio is proposed for secondary users to share the licensed spectrum without causing harmful interference to primary users. As such, the transmit power of a secondary user is limited even when it accesses the spectrum hole. Therefore, multihop transmission...
Cognitive radio methodologies have the potential to dramatically increase the throughput of wireless systems. Herein, control strategies which enable the superposition in time and frequency of primary and secondary user transmissions are explored in contrast to more traditional sensing approaches which only allow the secondary user to transmit when the primary user is idle. In this work, the optimal...
In this paper, we consider the design of efficient anti-jamming coding techniques for recovering lost packets transmitted through parallel channels. We present two coding schemes with small overhead and low complexity, namely, rateless coding and piecewise coding. For piecewise coding, we propose the optimal as well as several suboptimal design methods to build short block codes with small number...
Because of its flexible spectrum shaping, OFDM technologies can be used for cognitive radio as signaling method. Spectrum notches can be generated through turning off subcarriers to protect primary users (licensee users), but the intercarrier interference may limit the notch depth. This paper focuses on the enhancing methods to deepen spectrum notch and proposes two kinds of OFDM subcarriers coding...
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.