Michael E Parr

US Patent:

6374096, Apr 16, 2002

Filed:

Jun 1, 1999

Appl. No.:

09/323319

Inventors:

Michael Parr - Hermosa Beach CA

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

H04B 1700

US Classification:

4552261, 455 63, 455423, 455 121, 342359

Abstract:

A method, and related apparatus, for detecting interference at a first communications terminal comprising establishing a communications link between the first communications terminal and a second communications terminal. Then monitoring a noise floor of the communications link over time, the noise floor representing a base level of noise present in the communications link and calculating a long term noise floor power level without interference in response to the monitoring of the noise floor of the communications link over time. Then monitoring a noise floor of a current communication through the communications link, representing a current level of noise present on the communications link and calculating a short term noise floor power level in response to the monitoring of the noise floor of the current communication through the communications link. Finally, comparing the short-term noise floor power level with the long term noise floor power level without interference.

US Patent:

6721538, Apr 13, 2004

Filed:

Oct 5, 2000

Appl. No.:

09/678681

Inventors:

John Sullivan - Manhattan Beach CA
David Roos - Boyds MD
Michael Parr - Del Mar CA

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

H04B 719

US Classification:

455 132, 455 302, 455 121, 455 134, 455427

Abstract:

An approach for minimizing variation in transmit power of synchronized signals that are destined to a satellite is disclosed. A gateway station system for communicating with a communication satellite includes a multiple signal sources which generate the synchronized signals. The gateway station system utilizes a control logic that is coupled to the signal sources. The control logic operates to offset selectively transmission times of a portion of the synchronized signals according to a predetermined distribution and an offset period. The predetermined distribution specifies about half the number of the synchronized signals are to be offset. The offset period is half a symbol period. The terminals within the satellite communication system has a receiver that receives the synchronized signal from the communication satellite. Each of the terminals also includes an offset-determination logic that is coupled to the receiver and determines whether the synchronized signals are offset based upon a received assignment message. The assignment message has a control flag field that indicates whether the received signal is offset.