Ming Chang

US Patent:

6567052, May 20, 2003

Filed:

Nov 21, 2000

Appl. No.:

09/718973

Inventors:

Weizheng Wang - Rancho Palos Verdes CA
Donald C. D. Chang - Thousand Oaks CA
Ming Chang - Rancho Palos Verdes CA
Ying Feria - Manhattan Beach CA

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

H01Q 300

US Classification:

343765, 343705, 455431

Abstract:

A stratospheric platform communication system ( ) having antenna boresight angles (EL, AZ) that can be adjusted by an adjustable payload antenna ( ) according to the requirements of a specific application. The present invention provides an efficient use of available resources by allowing platform systems ( ) and GEO satellite systems to share the radio frequency spectrum without interference, and improves the coverage area provided by a stratospheric platform system by allocating stratospheric platforms ( ) to specific coverage areas in combination thereby increasing coverage capacity in high traffic areas.

US Patent:

6751458, Jun 15, 2004

Filed:

Jul 7, 2000

Appl. No.:

09/612465

Inventors:

Weizheng Wang - Rancho Palos Verdes CA
Donald C. D. Chang - Thousand Oaks CA
Ming U. Chang - Rancho Palos Verdes CA
Ying Feria - Manhattan Beach CA
Alan Cha - Glendale CA

Assignee:

The Directv Group, Inc. - El Segundo CA

International Classification:

H04Q 720

US Classification:

455427, 455447, 455443, 455 121

Abstract:

A communication system has a high altitude communication device generating a plurality of user link beams having a first communication characteristic and a feeder link having a first communication characteristic. A gateway terminal receives the user link beam. A user terminal receives at least one of the user link beams. The plurality of user link beams comprises a first user link beam within a first cell and a first isolation zone outside the first cell. The plurality of user link beams comprises a second user link beam having the first communication characteristic and positioned within a second cell and a second isolation zone outside said second cell. The second isolation zone overlaps the first isolation zone. The feeder link is positioned within the first isolation zone and the second isolation zone. The feeder link has the first communication characteristic.

US Patent:

6891813, May 10, 2005

Filed:

Dec 12, 2000

Appl. No.:

09/735861

Inventors:

Ying Feria - Manhattan Beach CA, US
Ming Chang - Rancho Palos Verdes CA, US
Donald Chang - Thousand Oaks CA, US

Assignee:

The DirecTV Group, Inc. - El Segundo CA

International Classification:

H04Q007/20

US Classification:

370329, 3703102, 370316, 370320, 370328

Abstract:

A communications system and method of operating the communications system includes a high altitude communication device that communicates with a plurality of user terminals and a gateway station. The gateway station couples the users to terrestrial networks and other users. The high altitude communication device has a controller that assigns a first code to a beam of a first plurality of users. When one of the first plurality of users moves to interfere with one of the other of the first plurality of users, the beam associated with the user is reassigned another code.

US Patent:

7027769, Apr 11, 2006

Filed:

Nov 22, 2000

Appl. No.:

09/721854

Inventors:

Harold A. Rosen - Santa Monica CA, US
Donald C. D. Chang - Thousand Oaks CA, US
Ming U. Chang - Rancho Palos Verdes CA, US
Weizheng Wang - Rancho Palos Verdes CA, US
Wah L. Lim - Santa Ana CA, US

Assignee:

The DirecTV Group, Inc. - El Segundo CA

International Classification:

H04B 7/15

US Classification:

455 111, 455431, 455427, 455 131

Abstract:

A method for communicating and a communications system apparatus are disclosed. The apparatus comprises a communications platform and a gateway communicatively coupleable with a terrestrially-based network. The communications platform is disposed in a stratospheric location and transponds information between at least one of a plurality of user terminals and the gateway in essentially a bent pipe fashion. The method comprises the steps of receiving a first signal from the user terminal having an antenna in a stratospherically-based communication platform that maintains an apparent position relative to the user terminal within a beamwidth of a user terminal antenna and transponding the first signal from the stratospherically based communications platform to a gateway ground station.

US Patent:

7089000, Aug 8, 2006

Filed:

May 30, 2000

Appl. No.:

09/584012

Inventors:

Ming U. Chang - Rancho Palos Verdes CA, US
Kar W. Yung - Torrance CA, US
Frank A. Hagen - Palos Verdes Estates CA, US
Donald C. D. Chang - Thousand Oaks CA, US

Assignee:

The DirecTV Group, Inc. - El Segundo CA

International Classification:

H04Q 7/20

US Classification:

455430, 455 131

Abstract:

A mobile wireless communications system including a plurality of individual transponding platforms all in communication with a central processing hub. A signal processed by the central processing hub is radiated simultaneously through multiple paths to a plurality of the individual transponding platforms. The signal transmitted to each transponding platform by the hub is appropriately delayed by the hub so as to equalize the differential delay of all such signals from a given receiver location. The radiated signal is then re-radiated by each of the plurality of individual transponding platforms to a mobile satellite terminal that receives the re-radiated signal from the plurality of individual transponding platforms. The signals from the plurality of transponding platforms are all received coherently by the intended user, and incoherently by all other users.

US Patent:

7236508, Jun 26, 2007

Filed:

Sep 28, 2001

Appl. No.:

09/967691

Inventors:

Ying J. Feria - Manhattan Beach CA, US
Donald C. D. Chang - Thousand Oaks CA, US
Ming U. Chang - Rancho Palos Verdes CA, US
Urban A. Von Der Embse - Westchester CA, US

Assignee:

The DirecTV Group, Inc. - El Segundo CA

International Classification:

H04B 1/00

US Classification:

375130

Abstract:

A method of increasing utilization of user link bandwidth for a code division multiple access communications system is disclosed that includes the steps of selecting a set of orthogonal complex codes each having a code length that is greater than a code length of an optimum real code and less than or equal to a number of antenna elements in an antenna array of the feeder link.

US Patent:

7558569, Jul 7, 2009

Filed:

Jul 9, 2004

Appl. No.:

10/887798

Inventors:

Ming U. Chang - Rancho Palos Verdes CA, US
John G. Himes - Placentia CA, US
Marvin D. Swensen - Fullerton CA, US

Assignee:

The Boeing Company - Chicago IL

International Classification:

H04W 40/00

US Classification:

455428, 455431, 455 121

Abstract:

A wireless communications system and method provides wireless communications service for user equipment on board an aircraft. The aircraft includes on-board system equipment for supporting the wireless communications service with on-board user equipment. One or more ground stations are used for communicating with the aircraft using a plurality of feeder links for exchanging the wireless communications service's traffic and control information with the on-board system equipment, and for providing interfaces with a terrestrial telecommunications infrastructure. The on-board system equipment transitions connections by the on-board user equipment between the feeder links.

US Patent:

20020150067, Oct 17, 2002

Filed:

Aug 31, 2001

Appl. No.:

09/945483

Inventors:

Ying Feria - Manhattan Beach CA, US
Donald Chang - Thousand Oaks CA, US
Ming Chang - Rancho Palos Verdes CA, US

International Classification:

H04B007/216
H04J011/00

US Classification:

370/335000, 370/203000, 370/342000

Abstract:

A method of increasing utilization of user link bandwidth for a code division multiple access communications system is disclosed that includes the steps of selecting a set of orthogonal complex codes each having a code length that is greater than a code length of an optimum real code and less than or equal to a spreading code length; and transferring symbols across at least one of a plurality of user links to or from at least one of a corresponding plurality of user terminals wherein the symbols are represented by a corresponding one of the set of orthogonal complex codes.