Robert M Dixon

US Patent:

6389059, May 14, 2002

Filed:

Mar 23, 1999

Appl. No.:

09/275067

Inventors:

Douglas G. Smith - Arlington VA
Robert C. Dixon - Palmer Lake CO
Jeffrey S. Vanderpool - Colorado Springs CO

Assignee:

Xircom Wireless, Inc. - Colorado Springs CO

International Classification:

H04K 100

US Classification:

375141

Abstract:

A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and microcellular mode. Selectable frequency bands include both licensed and unlicensed frequency bands, particularly frequency bands including the 902-928 MHz, 1850-1990 MHz, and 2. 4-2. 4835 GHz frequency bands. Spread-spectrum communication channels are 10 MHz or less in width. The frequency band onto which spread-spectrum signals are encoded may be changed upon a change in environment or other control trigger, such as establishment or de-establishment of communication with a private access network.

US Patent:

6891816, May 10, 2005

Filed:

Jun 14, 2001

Appl. No.:

09/882270

Inventors:

Douglas G. Smith - Arlington VA, US
Robert C. Dixon - Palmer Lake CO, US

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H04B007/216
H04J013/02

US Classification:

370335, 370342, 370349, 370469, 375142, 375146, 375150, 455 381, 455450

Abstract:

A spread spectrum transmitter adapted for transmitting input data streams from a DECT (Digital European Cordless Telecommunication System) MAC (medium-access control) layer, where the data streams conform to a DECT physical layer packet structure. A related spread spectrum receiver is also disclosed.

US Patent:

57905878, Aug 4, 1998

Filed:

Jun 7, 1995

Appl. No.:

8/483514

Inventors:

Douglas G. Smith - Arlington VA
Robert C. Dixon - Palmer Lake CO
Jeffrey S. Vanderpool - Colorado Springs CO

Assignee:

Omnipoint Corporation - Colorado Springs CO

International Classification:

H04K 100
H04L 2726

US Classification:

375200

Abstract:

A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and microcellular mode. Selectable frequency bands include both licensed and unlicensed frequency bands, particularly frequency bands including the 902-928 MHz, 1850-1990 MHz, and 2. 4-2. 4835 GHz frequency bands. Spread-spectrum communication channels are 10 MHz or less in width. The frequency band onto which spread-spectrum signals are encoded may be changed upon a change in environment or other control trigger, such as establishment or de-establishment of communication with a private access network. A multi-band transmitter comprises a single frequency synthesizer and a frequency source (e. g. , a local oscillator), coupled to a selectable band pass filter.

US Patent:

42019559, May 6, 1980

Filed:

Mar 22, 1978

Appl. No.:

5/889072

Inventors:

Raymond C. Elton - Potomac MD
Robert H. Dixon - Bowie MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H01S 322

US Classification:

331 945G

Abstract:

A stimulated emission device operative in the ultraviolet and soft x-ray regions. A high-power infrared laser is focused on a slab target vaporizing the material and generating highly stripped target ions with varying velocities. Just prior to laser initiation, a gaseous environment of helium, hydrogen, argon or neon is injected to surround the target (e. g. , carbon) at a pressure of from 1-10 Torr. The injected gas and associated electrons modify and mix the interacting particles originating from the vaporized target. Ion-atom resonance, charge-transfer reactions take place to form excited-state ions to produce amplified stimulated emission in the 300-800 Angstrom region.

US Patent:

62721216, Aug 7, 2001

Filed:

Mar 3, 1997

Appl. No.:

8/811108

Inventors:

Douglas G. Smith - Arlington VA
Robert C. Dixon - Palmer Lake CO

Assignee:

Omnipoint Corporation - Colorado Springs CO

International Classification:

H04B 7216

US Classification:

370342

Abstract:

A time division multiplexed wireless communication system using the DECT protocol with spread-spectrum modulation. The wireless communication system includes a spread-spectrum transmitter and receiver. The spread spectrum transmitter transmits using an M-ary spread spectrum transmission technique, sending a predefined chip code (symbol code) for each data symbol. The predefined chip codes used are relatively short, so that spread spectrum synchronization is accomplished within about a single data symbol transmission time, well within the constraints of the DECT timing structure. The spread spectrum signal may be transmitted over a bandwidth of under 20 MHz (e. g. , about 5 MHz) covering a plurality of DECT frequency channels, so as to be confined within, or overlapping with, the bandwidth of a DECT system, and so as to minimize interference with other users, if any, of the same frequency spectrum. A spread spectrum transmission in a DECT time slot may overlay one or more narrowband transmissions, or may overlay other spread spectrum transmissions. Code division multiplexing may also be used to allow multiple spread spectrum transmissions to be sent during a single DECT time slot.

US Patent:

45080550, Apr 2, 1985

Filed:

Jun 3, 1983

Appl. No.:

6/500725

Inventors:

Raymond C. Elton - Potomac MD
Robert H. Dixon - Bowie MD
James L. Ford - Upper Marlboro MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

C23C 1308

US Classification:

118724

Abstract:

A device for fabricating a target of a lasing material and a pump material or lasing at X-ray wavelengths wherein one of the materials occurs naturally as a gas. A substrate of the other material is cooled below the freezing point of the one material occuring naturally as a gas. Then a gaseous atmosphere of the latter material is supplied to the cooled substrate so that a frozen layer of the latter material condenses onto the substrate to form the target.

US Patent:

58155252, Sep 29, 1998

Filed:

Mar 27, 1996

Appl. No.:

8/622812

Inventors:

Douglas G. Smith - Arlington VA
Robert C. Dixon - Palmer Lake CO
Jeffrey S. Vanderpool - Colorado Springs CO

Assignee:

Omnipoint Corporation - Colorado Springs CO

International Classification:

H04K 100
H04L 2704
H04L 2406

US Classification:

375200

Abstract:

A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and microcellular mode. Selectable frequency bands include both licensed and unlicensed frequency bands, particularly frequency bands including the 902-928 MHz, 1850-1990 MHz, and 2. 4-2. 4835 GHz frequency bands. Spread-spectrum communication channels are 10 MHz or less in width. The frequency band onto which spread-spectrum signals are encoded may be changed upon a change in environment or other control trigger, such as establishment or de-establishment of communication with a private access network.

US Patent:

61188247, Sep 12, 2000

Filed:

Apr 20, 1998

Appl. No.:

9/063639

Inventors:

Douglas G. Smith - Washington DC
Robert C. Dixon - Palmer Lake CO
Jeffrey S. Vanderpool - Colorado Springs CO

Assignee:

Omnipoint Corporation - Colorado Springs CO

International Classification:

H04L 1218
H04L 2700
H04L 2906
H04B 138

US Classification:

375259

Abstract:

A system for publishing data on shared broadcast channels using spread-spectrum techniques, which may comprise a spread-spectrum encoder capable of receiving data and placing it in a spread-spectrum signal format and a transmitter operating on a shared communication channel or frequency band, such as might be allocated to terrestrial point-to-point or broadcast communications. The shared communication channel may comprise a cellular system, in which data may be transmitted using spread-spectrum techniques using the transmitters and repeaters of the cellular system simultaneously with voice and other transmissions associated with the cellular system. A subscriber station may be capable of receiving using a plurality of different communication channels or frequency bands, such as a first receiver capable of cellular reception and a second receiver capable of satellite reception, at least one of which uses spread-spectrum techniques. The subscriber station may also comprise a transmitter using at least one communication channel or frequency band, so that the subscriber station may receive data or other transmissions using one channel and may request further data or other transmissions using a second channel.