DOE Patents Database - Search Results

Patent Title	Inventor(s)	Issue Date	Patent Number
The multi-pulse frequency shifted technique uses mutually orthogonal short duration pulses o transmit and receive information in a UWB multiuser communication system. The multiuser system uses the same pulse shape with different frequencies for the reference and data for each user. Different users have a different pulse shape (mutually orthogonal to each other) and different transmit and reference frequencies. At the receiver, the reference pulse is frequency shifted to match the data pulse and a correlation scheme followed by a hard decision block detects the data. Multi-pulse frequency shifted (MPFS) multiple access modulation for ultra wideband	Nekoogar, Faranak , Dowla, Farid U.	01/24/2012	8,102,955
A novel technique and structure that maximizes the extraction of information from reference pulses for UWB-TR receivers is introduced. The scheme efficiently processes an incoming signal to suppress different types of UWB as well as non-UWB interference prior to signal detection. Such a method and system adds a feedback loop mechanism to enhance the signal-to-noise ratio of reference pulses in a conventional TR receiver. Moreover, sampling the second order statistical function such as, for example, the autocorrelation function (ACF) of the received signal and matching it to the ACF samples of the original pulses for each transmitted bit provides a more robust UWB communications method and system in the presence of channel distortions. UWB communication receiver feedback loop	Spiridon, Alex , Benzel, Dave , Dowla, Farid U. , Nekoogar, Faranak , Rosenbury, Erwin T.	12/04/2007	7,305,052
The present invention presents a simple and novel channel estimation scheme for UWB communication systems. As disclosed herein, the present invention maximizes the extraction of information by incorporating a new generation of transmitted-reference (Tr) transceivers that utilize a single reference pulse(s) or a preamble of reference pulses to provide improved channel estimation while offering higher Bit Error Rate (BER) performance and data rates without diluting the transmitter power. UWB channel estimation using new generating TR transceivers	Nekoogar, Faranak , Dowla, Farid U. , Spiridon, Alex , Haugen, Peter C. , Benzel, Dave M.	06/28/2011	7,970,047
A new Radio Frequency Identification (RFID), tracking, powering apparatus/system and method using coded Ultra-wideband (UWB) signaling is introduced. The proposed hardware and techniques disclosed herein utilize a plurality of passive UWB transponders in a field of an RFID-radar system. The radar system itself enables multiple passive tags to be remotely powered (activated) at about the same time frame via predetermined frequency UWB pulsed formats. Once such tags are in an activated state, an UWB radar transmits specific "interrogating codes" to put predetermined tags in an awakened status. Such predetermined tags can then communicate by a unique "response code" so as to be detected by an UWB system using radar methods. Method of remote powering and detecting multiple UWB passive tags in an RFID system	Dowla, Farid U. , Nekoogar, Faranak , Benzel, David M. , Dallum, Gregory E. , Spiridon, Alex	05/29/2012	8,188,841

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