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 studies fixed wideband beamforming with consideration of realistic channels. There has been a perception that nice beam patterns can always be formed with advanced optimization techniques. This is mostly true if the channels are ideal. But in reality it is not always true. Indeed, achieving a desirable beam pattern with an actual beamforming system can be very difficult, and this might...
In order to be viable for use in communication and radar systems, wideband beamforming requires the calculation of filter coefficients to be performed quickly so as to avoid undesirable latency in the system. This paper provides a quick introduction to the method of least-squares wideband beamforming and discusses the use of General Purpose computation on Graphics Processing Units (GPGPU) for acceleration...
In this paper, wideband waveform design for relay cognitive network will be presented. There is one transmitter, several relay nodes and one or several receivers in cognitive network. Assume there is no direct communication link between the transmitter and the receiver. We would like to jointly design the transmitted waveform and the FIR filters at the relay nodes such that the received signal to...
A 16-channel digital wideband phased array without antenna is characterized using impulse response measurement. A chirp signal is used as probing signal. By careful chirp design, impulse response at sub-band is measured for all the channels. Spectral domain response showing dispersive phase and magnitude reveals significant imbalance among the channels. Based on time reversal technique principle,...
Wideband beamforming with a real-time array testbed will be studied in this paper. The algorithm and implementation architecture on wideband beamforming will be the main focus. The contribution of this paper can be summarized in the following three aspects. First, the channel imbalances among different RF chains will be taken into account. The equivalent complex baseband impulse responses of RF chains...
Robust wideband beamforming with a real-time array testbed will be studied in this paper. For the practical consideration of uncertainty, channel impulse responses or channel transform functions of RF chains can not be obtained exactly due to the limitation of sounding and calibration procedure. Thus robust optimization will be applied to wideband beamforming. It is assumed that the uncertainty will...
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.