Larry S Thomson

US Patent:

6498820, Dec 24, 2002

Filed:

May 6, 1999

Appl. No.:

09/305954

Inventors:

Larry S. Thomson - Grass Valley CA
Carl H. Alelyunas - Nevada City CA

Assignee:

3Com Corporation - Santa Clara CA

International Classification:

H04B 110

US Classification:

375346, 375222, 375229, 375285

Abstract:

A method and apparatus for estimating the frequency of a periodic signal and for canceling the interference in a modem signal. Power line noise may interfere with electronic signals. Since power lines may be either 50 Hz or 60 Hz, depending on the country, frequency estimation of the periodic power line noise is necessary. Modem signals are received and autocorrelated in order to identify the periodic characteristics of the signal over time. Once the frequency is identified, the power line noise is modeled based on creating a circular buffer. Initially, the circular buffer is composed of scaled samples of one cycle of the fundamental frequency of the power line noise. Thereafter, samples are received, scaled, and combined with previous buffer values in order to update the buffer. In this manner, the buffer models the power line noise, so that the power line noise may be removed from the system.

US Patent:

6507303, Jan 14, 2003

Filed:

May 31, 2000

Appl. No.:

09/584459

Inventors:

Carl H. Alelyunas - Nevada City CA 95959
Cotter W. Sayre - Nevada City CA 95959
Larry Thomson - Howell NJ 07731

International Classification:

H03M 166

US Classification:

341144, 341118

Abstract:

Method and apparatus for shifting of a lowpass signal to a higher frequency and for precompensating distortion caused by a digital to analog converter (DAC). Higher frequency signals are generated by filtering the output of the DAC so that at least one of the replicas generated by the DAC is the signal of interest. In this manner, the higher frequency signals for wireless transmitters, or for other applications, may be generated more easily. Moreover, compensation for distortion caused by the DAC is performed by a precompensator which modifies for distortion, not at the baseband signal, but at a passband frequency.

US Patent:

6703954, Mar 9, 2004

Filed:

Dec 20, 2002

Appl. No.:

10/327448

Inventors:

Carl H. Alelyunas - Nevada City CA
Cotter W. Sayre - Nevada City CA
Larry Thomson - Howell NJ

Assignee:

3Com Corporation - Santa Clara CA

International Classification:

H03M 166

US Classification:

341144

Abstract:

Method and apparatus for shifting of a lowpass signal to a higher frequency and for precompensating distortion caused by a digital to analog converter (DAC). Higher frequency signals are generated by filtering the output of the DAC so that at least one of the replicas generated by the DAC is the signal of interest. In this manner, the higher frequency signals for wireless transmitters, or for other applications, may be generated more easily. Moreover, compensation for distortion caused by the DAC is performed by a precompensator which modifies for distortion, not at the baseband signal, but at a passband frequency.

US Patent:

7423577, Sep 9, 2008

Filed:

Nov 3, 2006

Appl. No.:

11/592536

Inventors:

William K. McIntire - Sandy UT, US
Larry S. Thomson - Bountiful UT, US
David H. Robbins - Bountiful UT, US
James J. Boesch - Salt Lake City UT, US

International Classification:

G01S 13/00
H04L 27/00
H04B 1/00

US Classification:

342 57, 375145, 375295

Abstract:

A system and method for transmitting high data rate information from a pulsed radar is disclosed. The method includes collecting information using a mobile radar platform. The information is divided into a plurality of segments. Each segment is configured to fit within a time period less than a radar burst signal time period. Each segment is modulated onto a radar burst signal to form modulated radar burst signals. The modulated radar burst signals are transmitted from the pulsed radar system.

US Patent:

7453391, Nov 18, 2008

Filed:

Nov 3, 2006

Appl. No.:

11/592376

Inventors:

William K. McIntire - Sandy UT, US
Larry S. Thomson - Bountiful UT, US
David H. Robbins - Bountiful UT, US
James J. Boesch - Salt Lake City UT, US

Assignee:

L-3 Communications, Corp. - New York NY

International Classification:

G01S 13/00

US Classification:

342 57, 342 30

Abstract:

A method for asynchronously transmitting bursts of data from a communications terminal to a burst radar transceiver is disclosed. The burst radar can transmit a plurality of bursts, each separated by an inter-burst interval. An inter-burst interval length of the burst radar transceiver can be established. A burst of data at the communications terminal can be formed having a terminal burst interval length less than half the inter-burst interval of the burst radar transceiver. The burst of data can be transmitted a plurality of times from the communications terminal to the burst radar transceiver.

US Patent:

7538713, May 26, 2009

Filed:

Nov 3, 2006

Appl. No.:

11/592377

Inventors:

Larry S. Thomson - Bountiful UT, US
William K. McIntire - Sandy UT, US
David H. Robbins - Bountiful UT, US
James J. Boesch - Salt Lake City UT, US

Assignee:

L-3 Communications, Corp. - New York NY

International Classification:

G01S 13/00

US Classification:

342 57, 342 30, 342 58, 342 60

Abstract:

A method for transmitting bursts of data from a communications terminal to a mobile radar transceiver having inter-burst periods is disclosed. The method includes determining a propagation time between the communications terminal and mobile radar transceiver. A length of inter-burst periods of the mobile radar transceiver having an inter-burst timing can be determined. Bursts of data having a communication burst period that is less than the inter-burst period can be formed. The bursts of data from the communications terminal can be transmitted at a transmission time based on the inter-burst timing and the propagation time to enable each burst of data to be received by the mobile radar transceiver during one of the inter-burst periods.

US Patent:

7545309, Jun 9, 2009

Filed:

Nov 3, 2006

Appl. No.:

11/592537

Inventors:

William K. McIntire - Sandy UT, US
Larry S. Thomson - Bountiful UT, US
David H. Robbins - Bountiful UT, US
James J. Boesch - Salt Lake City UT, US

Assignee:

L-3 Communications, Corp. - New York NY

International Classification:

G01S 13/00
H04B 1/10

US Classification:

342 57, 455218, 455223

Abstract:

A method is disclosed for transmitting low data rate symbols from a communications terminal to a burst radar transceiver. A plurality of bursts can be emitted from a burst radar transceiver, each burst having a burst interval and separated by an inter-burst interval. A symbol can be transmitted from the communications terminal to the burst radar transceiver. The symbol has a symbol period that is substantially longer than a radar transceiver burst period comprising the burst interval and the inter-burst interval. Symbol energy can be accumulated during inter-burst intervals at the burst radar transceiver over a plurality of burst periods for approximately the symbol period.

US Patent:

7570196, Aug 4, 2009

Filed:

May 1, 2007

Appl. No.:

11/799342

Inventors:

Vaughn L. Mower - Bountiful UT, US
Larry S. Thomson - Bountiful UT, US
David H. Robbins - Bountiful UT, US
James J. Boesch - Cottonwood Heights UT, US

Assignee:

L-3 Communications Corporation - New York NY

International Classification:

G01S 13/00

US Classification:

342 57, 342 59, 342159, 342198

Abstract:

A method, computer program product, apparatus and system are provided. In one exemplary embodiment, a method includes: receiving at a second unit periodic energy bursts transmitted by a first unit; blanking a transmitter of the second unit in accordance with the received periodic energy bursts such that the transmitter is unable to transmit when the second unit is receiving a periodic energy burst; and transmitting a plurality of instances of a same data from the second unit to the first unit.