Farid Ud Dowla

7194019, Mar 20, 2007

Jul 30, 2003

10/631560

Farid U. Dowla - Castro Valley CA, US
Faranak Nekoogar - San Ramon CA, US

The Regents of the University of California - Oakland CA

H04B 1/00

375147, 375259, 375141, 375139

A new modulation scheme in UWB communications is introduced. This modulation technique utilizes multiple orthogonal transmitted-reference pulses for UWB channelization. The proposed UWB receiver samples the second order statistical function at both zero and non-zero lags and matches the samples to stored second order statistical functions, thus sampling and matching the shape of second order statistical functions rather than just the shape of the received pulses.

7277644, Oct 2, 2007

Sep 30, 2003

10/676450

Gary W. Johnson - Livermore CA, US
Farid U. Dowla - Castro Valley CA, US
Anthony J. Ruggiero - Livermore CA, US

The Regents of the University of California - Oakland CA

H04B 10/00

398158, 398140, 398118, 398119

Free-space optical (FSO) laser communication systems offer exceptionally wide-bandwidth, secure connections between platforms that cannot other wise be connected via physical means such as optical fiber or cable. However, FSO links are subject to strong channel fading due to atmospheric turbulence and beam pointing errors, limiting practical performance and reliability. We have developed a fade-tolerant architecture based on forward error correcting codes (FECs) combined with delayed, redundant, sub-channels. This redundancy is made feasible though dense wavelength division multiplexing (WDM) and/or high-order M-ary modulation. Experiments and simulations show that error-free communications is feasible even when faced with fades that are tens of milliseconds long. We describe plans for practical implementation of a complete system operating at 2. 5 Gbps.

7305052, Dec 4, 2007

Mar 31, 2004

10/815450

Alex Spiridon - Palo Alto CA, US
Dave Benzel - Livermore CA, US
Farid U. Dowla - Castro Valley CA, US
Faranak Nekoogar - San Ramon CA, US
Erwin T. Rosenbury - Castro Valley CA, US

The Regents of the University of California - Oakland CA

H04L 27/08
H04L 27/00
H04B 1/00
H04B 7/165
H01Q 11/12

375345, 375147, 375259, 455 23, 455118

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.

7383053, Jun 3, 2008

Apr 28, 2004

10/834706

Claudia A. Kent - Pleasanton CA, US
Farid Dowla - Castro Valley CA, US

Lawrence Livermore National Security, LLC - Livermore CA

H04Q 7/20

4554565, 342458, 340 1034, 367127

This invention provides a system and method using wireless communication interfaces coupled with statistical processing of time-of-flight data to locate by position estimation unknown wireless receivers. Such an invention can be applied in sensor network applications, such as environmental monitoring of water in the soil or chemicals in the air where the position of the network nodes is deemed critical. Moreover, the present invention can be arranged to operate in areas where a Global Positioning System (GPS) is not available, such as inside buildings, caves, and tunnels.

7548576, Jun 16, 2009

Jun 24, 2005

11/165867

Farid U. Dowla - Castro Valley CA, US
Franak Nekoogar - San Ramon CA, US
Alex Spiridon - Palo Alto CA, US

Lawrence Livermore National Security, LLC - Livermore CA

H04B 1/69

375130, 375142, 375147, 375160, 375152, 375316, 375340

A novel UWB communications method and system that provides self-organization for wireless sensor networks is introduced. The self-organization is in terms of scalability, power conservation, channel estimation, and node synchronization in wireless sensor networks. The UWB receiver in the present invention adds two new tasks to conventional TR receivers. The two additional units are SNR enhancing unit and timing acquisition and tracking unit.

7962150, Jun 14, 2011

Dec 11, 2006

11/637388

Claudia A. Hertzog - Houston TX, US
Farid U. Dowla - Castro Valley CA, US
Gregory E. Dallum - Livermore CA, US
Carlos E. Romero - Livermore CA, US

Lawrence Livermore National Security, LLC - Livermore CA

H04Q 7/20

4554561, 4554562, 340 101

This invention provides a novel high-accuracy indoor ranging device that uses ultra-wideband (UWB) RF pulsing with low-power and low-cost electronics. A unique of the present invention is that it exploits multiple measurements in time and space for very accurate ranging. The wideband radio signals utilized herein are particularly suited to ranging in harsh RF environments because they allow signal reconstruction in spite of multipath propagation distortion. Furthermore, the ranging and positioning techniques discussed herein directly address many of the known technical challenges encountered in UWB localization regarding synchronization and sampling. In the method developed, noisy, corrupted signals can be recovered by repeating range measurements across a channel, and the distance measurements are combined from many locations surrounding the target in a way that minimizes the range biases associated to indirect flight paths and through-wall propagation delays.

7970047, Jun 28, 2011

Dec 27, 2006

11/646886

Faranak Nekoogar - San Ramon CA, US
Farid U. Dowla - Castro Valley CA, US
Alex Spiridon - Palo Alto CA, US
Peter C. Haugen - Livermore CA, US
Dave M. Benzel - Livermore CA, US

Lawrence Livermore National Security, LLC - Livermore CA

H03K 7/04

375239

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.

8102955, Jan 24, 2012

Sep 15, 2008

12/210827

Faranak Nekoogar - San Ramon CA, US
Farid U. Dowla - Castro Valley CA, US

Lawrence Livermore National Security, LLC - Livermore CA

H03D 1/04
H03D 1/06
H03K 5/01
H03K 6/04
H04B 1/10
H04L 1/00
H04L 25/08

375346, 327310, 327384, 327551

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.