Patents by Inventor Wah L. Lim
Wah L. Lim has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8706167Abstract: A communication system communications system for communicating with mobile user terminals includes a base station having an adaptive antenna with a plurality of panels. Each of the plurality of panels are arranged to have a different field of view. Each panel has a plurality of main array antenna elements for simultaneously generating a plurality of dynamic communication beams that move with the mobile terminals and a plurality of auxiliary elements separate from the plurality of main array antenna elements used for interference cancelling signals cancelling interference between the plurality of dynamic communication beams generated by the plurality of main array elements. A gateway station is coupled to the base station. The gateway station forms a plurality of beams commands for each of the plurality of panels by communicating a plurality of control signals to the base station to form the plurality of dynamic communication beams.Type: GrantFiled: February 20, 2013Date of Patent: April 22, 2014Assignee: The DIRECTV Group, Inc.Inventors: Donald C. D. Chang, Wah L. Lim, Ming U. Chang
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Publication number: 20130062471Abstract: A method of flying a constellation of inclined geosynchronous satellites at the same station longitude with specific spacing but without the possibility of collision and provides the basic equations defining the initial positions of satellites such that the satellites will continue to remain in synchronized positions relative to each other for a number of years with little or no north-south positioning. In preferred embodiments the number of satellites in the constellation is five or ten. Communication with the satellites in the constellation is provided with existing prior art tracking radio systems.Type: ApplicationFiled: May 20, 2011Publication date: March 14, 2013Inventors: Wah L. Lim, Jeremiah Salvatore
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Patent number: 8396513Abstract: A communication system has a base station having an adaptive antenna with a plurality of main array antenna elements for generating a plurality of communication beams. The system further includes a gateway station coupled to the base station. The gateway station forms a plurality of beams commands by communicating plurality of a control signals to the base station to form the communication beams.Type: GrantFiled: May 15, 2001Date of Patent: March 12, 2013Assignee: The DIRECTV Group, Inc.Inventors: Donald C. D. Chang, Wah L. Lim, Ming U. Chang
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Patent number: 7929984Abstract: A communication system has a first plurality of wireless basestations having adaptive antennas with a plurality of main array antenna elements for generating a plurality of communication beams. The system further includes a gateway station coupled to the first plurality of wireless basestations. The gateway station forms a plurality of beams commands by communicating plurality of a control signals to the first plurality of wireless basestations to form the communication beams. A second plurality of wireless base stations having a second plurality of adaptive antennas with a second plurality of main array antenna elements for generating a plurality of communication beams to communicate with said mobile user.Type: GrantFiled: January 12, 2007Date of Patent: April 19, 2011Assignee: The DIRECTV Group, Inc.Inventors: Donald C. D. Chang, Wah L. Lim, Ming U. Chang
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Patent number: 7809403Abstract: A communication system has a high altitude device having an adaptive antenna with a plurality of main array antenna elements for generating a plurality of communication beams. The system further includes a gateway station coupled to the high altitude device. The gateway station forms a plurality of beams commands by communicating a plurality of control signals to the high altitude device station to form the communication beams.Type: GrantFiled: May 15, 2001Date of Patent: October 5, 2010Assignee: The DIRECTV Group, Inc.Inventors: Donald C. D. Chang, Wah L. Lim, Ming U. Chang
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Publication number: 20090011789Abstract: A communication system has a first plurality of wireless basestations having adaptive antennas with a plurality of main array antenna elements for generating a plurality of communication beams. The system further includes a gateway station coupled to the first plurality of wireless basestations. The gateway station forms a plurality of beams commands by communicating plurality of a control signals to the first plurality of wireless basestations to form the communication beams. A second plurality of wireless base stations having a second plurality of adaptive antennas with a second plurality of main array antenna elements for generating a plurality of communication beams to communicate with said mobile user.Type: ApplicationFiled: January 12, 2007Publication date: January 8, 2009Inventors: Donald C. D. Chang, Wah L. Lim, Ming U. Chang
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Patent number: 7400857Abstract: A communication system has a communication infrastructure including at least two devices from the group including a cell tower, a first satellite constellation and a second satellite constellation, a stratospheric platform, that are coupled to user terminals through a plurality of dynamic links. The terminal monitors and changes the multiple and dynamic links as the position of the user terminal relative to the said at least two devices.Type: GrantFiled: September 28, 2001Date of Patent: July 15, 2008Assignee: The DIRECTV Group, Inc.Inventors: Donald C. D. Chang, Grant J. Beatson, Wah L. Lim, Ming U. Chang
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Patent number: 7187949Abstract: A communication system has a first plurality of wireless basestations having adaptive antennas with a plurality of main array antenna elements for generating a plurality of communication beams. The system further includes a gateway station coupled to the first plurality of wireless basestations. The gateway station forms a plurality of beam commands by communicating a plurality of control signals to the first plurality of wireless basestations to form the communication beams. A second plurality of wireless base stations having a second plurality of adaptive antennas with a second plurality of main array antenna elements for generating a plurality of communication beams to communicate with said mobile user and a fixed user. The beams include a first link and a second link from the first plurality of basestations that communicate with the fixed user terminal and a third link and fourth link from the second plurality of wireless basestations to communicate with the mobile user terminal.Type: GrantFiled: May 15, 2001Date of Patent: March 6, 2007Assignee: The DirecTV Group, Inc.Inventors: Donald C. D. Chang, Wah L. Lim, Ming U. Chang
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Patent number: 7181162Abstract: A communication system has a plurality of bases stations generating communication portions from a base station communication signal. The plurality of base stations are capable of using the entire allocated bandwidth to generate the base station communication portions. A user terminal establishes a plurality of dynamic links corresponding respectively to the plurality of base stations. The user terminal generates multiple communication portions of a user signal and transmits the multiple communication portions through the dynamic links to the plurality of base stations. The user terminal receives the base station communication portions from the plurality of bases stations and reassembles the communication portions into the base station communication signals.Type: GrantFiled: September 28, 2001Date of Patent: February 20, 2007Assignee: The DirecTV Group, Inc.Inventors: Donald C. D. Chang, Wah L. Lim, Ming U. Chang
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Patent number: 7167704Abstract: A communication system has a communication infrastructure and a gateway station communicating a communication signal to the communication infrastructure. An airplane having an antenna coupled to a processing circuit for establishing a plurality of multiple communication links corresponding to the communication infrastructure is used. The gateway station generates multiple datagrams from the television signal and transmits the multiple datagrams through the multiple dynamic links. The antenna receives the datagrams from the infrastructure and the processing circuit and reassembles the datagrams into the communication signal.Type: GrantFiled: March 24, 2006Date of Patent: January 23, 2007Assignee: The DirecTV Group, Inc.Inventors: Donald C. D. Chang, Wah L. Lim, Ming U. Chang
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Patent number: 7103317Abstract: A communication system has a communication infrastructure and a gateway station communicating a communication signal to the communication infrastructure. An airplane having an antenna coupled to a processing circuit for establishing a plurality of multiple communication links corresponding to the communication infrastructure is used. The gateway station generates multiple datagrams from the television signal and transmits the multiple datagrams through the multiple dynamic links. The antenna receives the datagrams from the infrastructure and the processing circuit and reassembles the datagrams into the communication signal.Type: GrantFiled: September 28, 2001Date of Patent: September 5, 2006Assignee: The DirecTV Group, Inc.Inventors: Donald C. D. Chang, Wah L. Lim, Ming U. Chang
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Patent number: 7068616Abstract: A method and apparatus is disclosed for communicating between a user terminal and a communications network based on an Internet protocol via multiple dynamic wireless communications linkages. A user terminal includes a multiple beam antenna, a plurality of amplifiers coupled to the multiple beam antenna, a plurality of bandpass filters coupled to the plurality of amplifiers, a modem coupled to the plurality of bandpass filters, a router & hub coupled to the modem, a transport layer coupled to the router & hub, and an estimation processor coupled to the router & hub.Type: GrantFiled: April 20, 2001Date of Patent: June 27, 2006Assignee: The DirecTV Group, Inc.Inventors: Donald C. D. Chang, Wah L. Lim, Ming U. Chang
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Patent number: 7027769Abstract: 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.Type: GrantFiled: November 22, 2000Date of Patent: April 11, 2006Assignee: The DirecTV Group, Inc.Inventors: Harold A. Rosen, Donald C. D. Chang, Ming U. Chang, Weizheng Wang, John I. Novak, III, Wah L. Lim
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Patent number: 6941107Abstract: A mobile communication system includes at least one user terminal and a plurality of satellites which transmit and receive a plurality of communication signals to and from the user terminal. The communication signals transmitted to and received from the plurality of satellites by a gateway station. The gateway station in turn is in communication with a processing center to process said communication signals. The processing center uses polystatic triangulation to determine a position of the at least one user terminal and redirect a signal from at least one said plurality of satellites in response to the determined position of the at least one user terminal.Type: GrantFiled: December 14, 2001Date of Patent: September 6, 2005Assignee: The DirecTV Group, Inc.Inventors: Donald C. D. Chang, Wah L. Lim, Ming U. Chang
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Patent number: 6725013Abstract: A communications system (10) and method of operating the communications system includes a high altitude communication device (12) that communicates with a plurality of user terminals and a gateway station (30). The gateway station (30) couples the users to terrestrial networks (32) and other users. The high altitude communication device (16) has a controller that generates a second beam having the first frequency to a service (26). The stratospheric platform (12) does not generate the second beam within a blocking area. User terminals within the service area outside the blocking area are configured to receive the first beam and the second beam.Type: GrantFiled: June 15, 2000Date of Patent: April 20, 2004Assignee: Hughes Electronics CorporationInventors: Donald C. D. Chang, Weizheng Wang, Ying Feria, Ming U. Chang, Harold A. Rosen, Wah L. Lim
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Publication number: 20030195404Abstract: A real-time controller operating as an artificial pancreas uses a Kalman control algorithm to control glucose level of a patient in real time. The real-time controller receives an estimate of the patient glucose level and a reference glucose level. The estimate of the patient glucose level can be provided by an optimal estimator implemented using a linearized Kalman filter. The estimated glucose level and the reference glucose level are processed by the Kalman control algorithm to determine a control command in real time. The Kalman control algorithm has a dynamic process forced by the control command a cost function determining a relative level of control. The control command is provided to a dispenser which secretes insulin or glucagon in response to the control command to correct a relatively high glucose level or a relatively low glucose level.Type: ApplicationFiled: April 16, 2003Publication date: October 16, 2003Inventors: Edward J. Knobbe, Wah L. Lim, Bruce A. Buckingham
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Patent number: 6575905Abstract: A real-time glucose estimator uses a linearized Kalman filter to determine a best estimate of glucose level in real time. The real-time glucose estimator receives at least one measurement corresponding to glucose level. The measurement can be obtained with one or more sensors and is provided to the linearized Kalman filter in real time. The linearized Kalman filter has dynamic models and executes a recursive routine to determine the best estimate of glucose level based upon the measurement. Additional information can be provided to the linearized Kalman filter for initialization, configuration, and the like. Outputs of the linearized Kalman filter can be provided to a patient health monitor for display or for statistical testing to determine status of the real-time glucose estimator. The real-time glucose estimator can be implemented using a software algorithm.Type: GrantFiled: September 21, 2001Date of Patent: June 10, 2003Assignee: Knobbe, Lim & BuckinghamInventors: Edward J. Knobbe, Wah L. Lim, Bruce A. Buckingham
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Patent number: 6572545Abstract: A real-time controller operating as an artificial pancreas uses a Kalman control algorithm to control glucose level of a patient in real time. The real-time controller receives an estimate of the patient glucose level and a reference glucose level. The estimate of the patient glucose level can be provided by an optimal estimator implemented using a linearized Kalman filter. The estimated glucose level and the reference glucose level are processed by the Kalman control algorithm to determine a control command in real time. The Kalman control algorithm has a dynamic process forced by the control command a cost function determining a relative level of control. The control command is provided to a dispenser which secretes insulin or glucagon in response to the control command to correct a relatively high glucose level or a relatively low glucose level.Type: GrantFiled: September 21, 2001Date of Patent: June 3, 2003Assignee: Knobbe, Lim & BuckinghamInventors: Edward J. Knobbe, Wah L. Lim, Bruce A. Buckingham
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Patent number: 6547190Abstract: A solar array including a carbon fiber mesh substrate is provided. The solar panels including a series of hybrid structures formed along the common and continuous substrate by sandwiching the substrate between a series of discontinuous upper and lower support layers. In order to construct the solar panels having such hybrid structure, a series of top support layers or upper face sheets is disposed on a upper surface of the substrate and between the folding sections. The solar cells are placed on top of the upper face sheets. Similarly, a series of lower support layers or lower face sheets are disposed on a bottom surface of the substrate and between the folding sections. The folding sections are the regions where the upper and lower face sheets discontinue and expose the underlying substrate. The solar array can be folded along the folding section when a bending force is applied over one of the hybrid structures.Type: GrantFiled: May 6, 2002Date of Patent: April 15, 2003Assignee: Hughes Electronics CorporationInventors: Brian D. Thompson, Wah L. Lim
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Publication number: 20030057329Abstract: A solar array including a carbon fiber mesh substrate is provided. The solar panels including a series of hybrid structures formed along the common and continuous substrate by sandwiching the substrate between a series of discontinuous upper and lower support layers. In order to construct the solar panels having such hybrid structure, a series of top support layers or upper face sheets is disposed on a upper surface of the substrate and between the folding sections. The solar cells are placed on top of the upper face sheets. Similarly, a series of lower support layers or lower face sheets are disposed on a bottom surface of the substrate and between the folding sections. The folding sections are the regions where the upper and lower face sheets discontinue and expose the underlying substrate. The solar array can be folded along the folding section when a bending force is applied over one of the hybrid structures.Type: ApplicationFiled: May 6, 2002Publication date: March 27, 2003Applicant: Hughes Electronics CorporationInventors: Brian D. Thompson, Wah L. Lim