Patents by Inventor Robert Lee Maxwell
Robert Lee Maxwell 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: 7149238Abstract: A discrete multitone stacked-carrier spread spectrum communication method is based on frequency domain spreading including multiplication of a baseband signal by a set of superimposed, or stacked, complex sinusoid carrier waves. In a preferred embodiment, the spreading involves energizing the bins of a large Fast Fourier transform (FFT). This provides a considerable savings in computational complexity for moderate output FFT sizes. Point-to-multipoint and multipoint-to-multipoint (nodeless) network topologies are possible. A code-nulling method is included for interference cancellation and enhanced signal separation by exploiting the spectral diversity of the various sources. The basic method may be extended to include multielement antenna array nulling methods for interference cancellation and enhanced signal separation using spatial separation. Such methods permit directive and retrodirective transmission systems that adapt or can be adapted to the radio environment.Type: GrantFiled: April 21, 2006Date of Patent: December 12, 2006Assignee: Cingular Wireless II, LLCInventors: Brian G. Agee, Matthew Bromberg, Derek Gerlach, David Gibbons, James Timothy Golden, Minnic Ho, Elliott Hoole, Mary Jesse, Robert Lee Maxwell, Robert G. Mechaley, Jr., Robert Ray Naish, David J. Nix, David James Ryan, David Stephenson
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Patent number: 7106781Abstract: A discrete multitone stacked-carrier spread spectrum communication method is based on frequency domain spreading including multiplication of a baseband signal by a set of superimposed, or stacked, complex sinusoid carrier waves. In a preferred embodiment, the spreading involves energizing the bins of a large Fast Fourier transform (FFT). This provides a considerable savings in computational complexity for moderate output FFT sizes. Point-to-multipoint and multipoint-to-multipoint (nodeless) network topologies are possible. A code-nulling method is included for interference cancellation and enhanced signal separation by exploiting the spectral diversity of the various sources. The basic method may be extended to include multielement antenna array nulling methods for interference cancellation and enhanced signal separation using spatial separation. Such methods permit directive and retrodirective transmission systems that adapt or can be adapted to the radio environment.Type: GrantFiled: August 3, 2001Date of Patent: September 12, 2006Assignee: Cingular Wireless II, LLCInventors: Brian G. Agee, Matthew Bromberg, Derek Gerlach, David Gibbons, James Timothy Golden, Minnie Ho, Elliott Hoole, Mary Jesse, Robert Lee Maxwell, Robert G. Mechaley, Jr., Robert Ray Naish, David J. Nix, David James Ryan, David Stephenson
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Patent number: 7095708Abstract: A fixed wireless system (FWS) utilizing Orthogonal Frequency Division Multiplexing (OFDM) communication techniques is spectrally efficient and responsive to communications involving both voice and high speed data, such as Internet data. The FWS includes a wireless base unit; a plurality of fixed wireless remote units; a plurality of wireless data traffic channels available between the wireless base unit and the plurality of fixed wireless remote units; and a plurality of wireless voice traffic channels available between the wireless base unit and the plurality of fixed wireless remote units. Each wireless traffic channel is identifiable by a unique combination of frequency and time slots. Each wireless data traffic channel is used for carrying high speed data in addressed data packets to and from the plurality of fixed wireless remote units.Type: GrantFiled: June 14, 2000Date of Patent: August 22, 2006Assignee: Cingular Wireless II, LLCInventors: Siavash Alamouti, Jeffrey Battin, David B. Gibbons, James Timothy Golden, Michael R. Hirano, Elliott Hoole, Mary Jesse, Robert Lee Maxwell, Steven E. McMeekin, David J. Nix, David James Ryan, Gregory J. Veintimilla, Hongliang Zhang
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Patent number: 6944299Abstract: An apparatus and method provide for synchronized operation of encryption processes at two remote communication terminals. A first one of the terminals detects information associated with a current time during the establishment of a connection between the two terminals. The current time information is then utilized to create a start encryption time. That start encryption time information is transmitted from the first terminal to the second terminal. Both terminals then monitor the passage of time and begin encryption in a synchronous manner when the current time matches the start encryption time.Type: GrantFiled: December 2, 1998Date of Patent: September 13, 2005Assignee: AT&T Wireless Services, Inc.Inventors: Padma P. Mallela, Robert Lee Maxwell, David J. Nix, Gregory J. Veintimilla, Adrian M. Yip
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Patent number: 6639935Abstract: A new method makes the most efficient use of the scarce spectral bandwidth in a wireless discrete multitone spread spectrum communications system. Each remote station and each base station in the network prepares an error detection field, such as a cyclic redundancy code (CRC), on each block of data to be transmitted over the traffic channels. The sending station prepares an error detection message for transmission over the link control channel of the network. The sending station prepares the error detection message by forming a link control channel vector that will be spread using the discrete multitone spread spectrum (DMT-SS) protocol to distribute the data message over a plurality of discrete tone frequencies, forming a spread signal for the link control channel. A link control channel is associated with communications session using the traffic channels. The instant of transmission of the error detection message is allowed to be different from the instant of transmission of the data message.Type: GrantFiled: July 12, 2001Date of Patent: October 28, 2003Assignee: AT&T Wireless Services, Inc.Inventors: David Gibbons, Robert Lee Maxwell, David James Ryan
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Patent number: 6621851Abstract: A discrete multitone stacked-carrier spread spectrum communication method is based on frequency domain spreading including multiplication of a baseband signal by a set of superimposed, or stacked, complex sinusoid carrier waves. In a preferred embodiment, the spreading involves energizing the bins of a large Fast Fourier transform (FFT). This provides a considerable savings in computational complexity for moderate output FFT sizes. Point-to-multipoint and multipoint-to-multipoint (nodeless) network topologies are possible. A code-nulling method is included for interference cancellation and enhanced signal separation by exploiting the spectral diversity of the various sources. The basic method may be extended to include multielement antenna array nulling methods for interference cancellation and enhanced signal separation using spatial separation. Such methods permit directive and retrodirective transmission systems that adapt or can be adapted to the radio environment.Type: GrantFiled: November 28, 2000Date of Patent: September 16, 2003Assignee: AT&T Wireless Services, Inc.Inventors: Brian G. Agee, Matthew Bromberg, Derek Gerlach, David Gibbons, James Timothy Golden, Minnie Ho, Elliott Hoole, Mary Jesse, Robert Lee Maxwell, Robert G. Mechaley, Jr., Robert Ray Naish, David J. Nix, David James Ryan, David Stephenson
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Publication number: 20020122465Abstract: A discrete multitone stacked-carrier spread spectrum communication method is based on frequency domain spreading including multiplication of a baseband signal by a set of superimposed, or stacked, complex sinusoid carrier waves. In a preferred embodiment, the spreading involves energizing the bins of a large Fast Fourier transform (FFT). This provides a considerable savings in computational complexity for moderate output FFT sizes. Point-to-multipoint and multipoint-to-multipoint (nodeless) network topologies are possible. A code-nulling method is included for interference cancellation and enhanced signal separation by exploiting the spectral diversity of the various sources. The basic method may be extended to include multielement antenna array nulling methods for interference cancellation and enhanced signal separation using spatial separation. Such methods permit directive and retrodirective transmission systems that adapt or can be adapted to the radio environment.Type: ApplicationFiled: August 3, 2001Publication date: September 5, 2002Inventors: Brian G. Agee, Matthew Bromberg, Derek Gerlach, David Gibbons, James Timothy Golden, Minnie Ho, Elliott Hoole, Mary Jesse, Robert Lee Maxwell, Robert G. Mechaley, Robert Ray Naish, David J. Nix, David James Ryan, David Stephenson
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Patent number: 6359923Abstract: A discrete multitone stacked-carrier spread spectrum communication method is based on frequency domain spreading including multiplication of a baseband signal by a set of superimposed, or stacked, complex sinusoid carrier waves. In a preferred embodiment, the spreading involves energizing the bins of a large Fast Fourier transform (FFT). This provides a considerable savings in computational complexity for moderate output FFT sizes. Point-to-multipoint and multipoint-to-multipoint (nodeless) network topologies are possible. A code-nulling method is included for interference cancellation and enhanced signal separation by exploiting the spectral diversity of the various sources. The basic method may be extended to include multielement antenna array nulling methods for interference cancellation and enhanced signal separation using spatial separation. Such methods permit directive and retrodirective rev transmission systems that adapt or can be adapted to the radio environment.Type: GrantFiled: December 18, 1997Date of Patent: March 19, 2002Assignee: AT&T Wireless Services, Inc.Inventors: Brian G. Agee, Matthew Bromberg, Derek Gerlach, David Gibbons, James Timothy Golden, Minnie Ho, Elliott Hoole, Mary Jesse, Robert Lee Maxwell, Robert G. Mechaley, Jr., Robert Ray Naish, David J. Nix, David James Ryan, David Stephenson
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Publication number: 20010040912Abstract: A new method makes the most efficient use of the scarce spectral bandwidth in a wireless discrete multitone spread spectrum communications system. Each remote station and each base station in the network prepares an error detection field, such as a cyclic redundancy code (CRC), on each block of data to be transmitted over the traffic channels. The sending station prepares an error detection message for transmission over the link control channel of the network. The sending station prepares the error detection message by forming a link control channel vector that will be spread using the discrete multitone spread spectrum (DMT-SS) protocol to distribute the data message over a plurality of discrete tone frequencies, forming a spread signal for the link control channel. A link control channel is associated with communications session using the traffic channels. The instant of transmission of the error detection message is allowed to be different from the instant of transmission of the data message.Type: ApplicationFiled: July 12, 2001Publication date: November 15, 2001Inventors: David Gibbons, Robert Lee Maxwell, David James Ryan
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Patent number: 6289037Abstract: A new method makes the most efficient use of the scarce spectral bandwidth in a wireless discrete multitone spread spectrum communications system. Each remote station and each base station in the network prepares an error detection field, such as a cyclic code (CRC), on each block of data to be transmitted over the traffic channels. The sending station prepares an error detection message for transmission over the link control channel of the network. The sending station prepares the error detection message by forming a link control channel vector that will be spread using the discrete multitone spread spectrum (DMT-SS) protocol to distribute the data message over a plurality of discrete tone frequencies, forming a spread signal for the link control channel. A link control channel is associated with communications session using the traffic channels. The instant of transmission of the error detection message is allowed to be different from the instant of transmission of the data message.Type: GrantFiled: February 24, 1997Date of Patent: September 11, 2001Assignee: AT&T Wireless Services Inc.Inventors: David Gibbons, Robert Lee Maxwell, David James Ryan