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.
In this paper, a new architecture of RF receivers in the cognitive radios is proposed for sensing the spectral environment. The receiver has two mixer stages and a high intermediate frequency (IF) for up/down dual-converting signal frequency. In order to select the channels in UHF (470-870 MHz) band in TV broadcast, the range of frequency points in the first local oscillator is from 1640 MHz to 2040...
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.