At&t Wireless Services, Inc.

Cingular Wireless Ii, LLC

David J Nix

Robert Lee Maxwell

David B Gibbons

Elliott Hoole

David J Ryan

Mary Jesse

James Timothy Golden

David Sheldon Stephenson

Brian G Agee

Derek Gerlach

Robert G Mechaley, Jr

Robert Ray Naish

Matthew Bromberg

Minnie Ho

Gregory J Veintimilla

Adrian Yip

Hongliang Zhang

Siavash Alamouti

Michael Hirano

Steven E McMeekin

Minnic Ho

Jeffrey Battin

Padma P Mallela

Stephanie H Cantwell

David A Rostowsky

David James Ryan

Minni Ho

Robert G Mechaley

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. Such systems are compatible with bandwidth-on-demand and higher-order modulation formats and use advanced adaptation algorithms. In a specific embodiment the spectral and spatial components of the adaptive weights are calculated in a unified operation based on the mathematical analogy between the spectral and spatial descriptions of the airlink.

Highly bandwidth-efficient communications

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. On the other hand, each wireless voice traffic channel can be assigned and dedicated to a particular voice communication call involving one of the plurality of fixed wireless remote units for carrying voice data of the call.

Methods and apparatus for use in communicating voice and high speed data in a wireless communication system

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.

Method for synchronous encryption over a communication medium

Priority messaging method for a discrete multitone spread spectrum communications system

A method and an apparatus provide for controlling a remote unit's requests to access network resources in a wireless communication network. The method and apparatus scale back the frequency with which the remote unit attempts to establish a connection with a base unit, which connection would provide dial tone to a communication device associated with a remote unit. In accordance with the method, with each unsuccessful attempt to establish a connection with the base unit a retry timing interval is extended, thereby throttling back the number of establishment attempts by the remote unit.

Method and apparatus for remote unit passivation

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. Such systems are compatible with bandwidth-on-demand and higher-order modulation formats and use advanced adaptation algorithms. In a specific embodiment the spectral and spatial components of the adaptive weights are calculated in a unified operation based on the mathematical analogy between the spectral and spatial descriptions of the airlink.

Highly bandwidth efficient communications

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Issaquah, WA, United States of America

David J Nix