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.
A wideband digital transmitting beamformer based on linear frequency modulation (LFM) signals is presented in this study. The wideband beamformer is realised as a combination of direct digital synthesisers and fractional delay (FD) filters in polyphase structure. By using coordinate rotation digital computer algorithm, high intermediate frequency wideband LFM signal is generated and phase compensation...
A method for wideband transmit beamforming using integer-time-delayed and phase-shifted waveforms is proposed. Unlike traditional true-time-delayed digital methods, which employ variable fractional delay filters or discrete Fourier transforms to create fractional time delays, the proposed method uses only integer-time-delayed waveforms with phase shifts corresponding to fractional time delays. Furthermore,...
In this paper, we focus on point-to-multipoint relaying in cellular system. The base station, the mobile users and fixed relay each have multiple antennas. The special case of MIMO fixed relays with random beamforming is investigated. Via path selection, for any mobile user, only a single relay or the home base station is selected for transmission. Since heavy interference may be cancelled in decoding...
Passive acoustic source location and tracking can be implemented by microphone array, which have a broad application on target detection and fault diagnosis etc. Five-element planar cross array is an effective structure for acoustic source location, but bad location results are often obtained by conventional relative acoustic source location methods in complicated environments. This paper proposed...
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.