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 (CR) permits multiple unlicensed users, secondary users, to share the same channels with the licensed users, primary users, without affecting the latter performance. The main challenge resides in the design of the secondary users' transceivers (precoding, postcoding, and power allocation) such that both the primary and secondary receivers enjoy satisfactory quality of service (QoS)...
New interference alignment (IA) design for secondary users' transceivers in multi-secondary users cognitive radio system is presented. The proposed scheme allows opportunistic transmitters (secondary users) equipped with multiple antennas (MIMO) to use the same frequency band already occupied by the pre-existing primary user. This can be done by aligning and cancelling the interference on the primary...
Energy efficient and reliable data forwarding becomes important if resources are limited such as in Wireless Sensor Networks (WSNs). Data-centric routing approaches have been proposed in the literature to provide more energy-efficient routing as opposed to the traditional end-to-end routing schemes known as address-centric approaches. In this paper, we present the variable-power data-centric routing...
This paper introduces a high-performance concealment algorithm for packetized PCM-coded speech as in ITU-T Recommendation G.711. The proposed prediction algorithm implements a combination of linear prediction model and reverse-order replicated pitch period technique as implemented in the ITU-T G.711 Appendix A (ITUT Recommendation G.117, November 2000). The new algorithm is compared to the ITU-T G...
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.