Abstract: A radio frequency transmitter comprising a modem which receives one or more input data signals and an adaptive predistortion signal and provides a baseband in-phase signal and a baseband quadrature signal. The transmitter may comprise a power amplifier module which receives the in-phase and quadrature phase signals and provides a radio frequency output signal. A predistortion module receives the radio frequency signal, downconverts the radio frequency signal to an intermediate frequency signal, and downconverts the intermediate frequency signal to a baseband feedback signal. The transmitter samples the feedback signal and provides an adaptive predistortion signal to the modem.

Abstract: A radio frequency transmitter comprising a modem which receives one or more input data signals and an adaptive predistortion signal and provides a baseband in-phase signal and a baseband quadrature signal. The transmitter may comprise a power amplifier module which receives the in-phase and quadrature phase signals and provides a radio frequency output signal. A predistortion module receives the radio frequency signal, downconverts the radio frequency signal to an intermediate frequency signal, and downconverts the intermediate frequency signal to a baseband feedback signal. The transmitter samples the feedback signal and provides an adaptive predistortion signal to the modem.

Abstract: A radio frequency transmitter comprising a modem which receives one or more input data signals and an adaptive predistortion signal and provides a baseband in-phase signal and a baseband quadrature signal. The transmitter may comprise a power amplifier module which receives the in-phase and quadrature phase signals and provides a radio frequency output signal. A predistortion module receives the radio frequency signal, downconverts the radio frequency signal to an intermediate frequency signal, and downconverts the intermediate frequency signal to a baseband feedback signal. The transmitter samples the feedback signal and provides an adaptive predistortion signal to the modem.

Abstract: A radio frequency transmitter comprising a modem which receives one or more input data signals and an adaptive predistortion signal and provides a baseband in-phase signal and a baseband quadrature signal. The transmitter may comprise a power amplifier module which receives the in-phase and quadrature phase signals and provides a radio frequency output signal. A predistortion module receives the radio frequency signal, downconverts the radio frequency signal to an intermediate frequency signal, and downconverts the intermediate frequency signal to a baseband feedback signal. The transmitter samples the feedback signal and provides an adaptive predistortion signal to the modem.

Abstract: A radio frequency transmitter comprising a modem which receives one or more input data signals and an adaptive predistortion signal and provides a baseband in-phase signal and a baseband quadrature signal. The transmitter may comprise a power amplifier module which receives the in-phase and quadrature phase signals and provides a radio frequency output signal. A predistortion module receives the radio frequency signal, downconverts the radio frequency signal to an intermediate frequency signal, and downconverts the intermediate frequency signal to a baseband feedback signal. The transmitter samples the feedback signal and provides an adaptive predistortion signal to the modem.

Abstract: A system and method for information communication between physically separated processor-based systems. Disclosed is a centralized communication array providing point to multipoint information communication between processor-based systems utilizing 5 communication nodes. Such information communication may be between two processor-based systems, each utilizing communication nodes or may be between a processor-based system utilizing a communication node and a processor-based system coupled to the centralized communication array through a backbone.

Abstract: Disclosed is a system and method for optimizing capacity in a multi-user time division duplex (“TDD”) communication system such as a broadband wireless radio frequency communication system. More specifically the invention minimizes guard time in duplexed signals to thereby allow for higher data throughput which results in an increase in system communication capacity. Depending upon instantaneous traffic load associated with the subscribers using a particular TDD carrier, guard times may be adjusted to provide a desired level of throughput. As traffic loads demand, the order of assignment of burst periods in either or both the transmit and receive frames of a TDD carrier with respect to the subscriber systems operable thereon are adjusted to accommodate desired guard times.

Abstract: A system and method for information communication between physically separated processor-based systems. Disclosed is a centralized communication array providing point to multipoint information communication between processor-based systems utilizing communication nodes. Such information communication may be between two processor-based systems, each utilizing communication nodes or may be between a processor-based system utilizing a communication node and a processor-based system coupled to the centralized communication array through a backbone.

Abstract: A system and method for information communication between physically separated processor-based systems. Disclosed is a centralized communication array providing point to multipoint information communication between processor-based systems utilizing communication nodes. Such information communication may be between two processor-based systems, each utilizing communication nodes or may be between a processor-based system utilizing a communication node and a processor-based system coupled to the centralized communication array through a backbone.

Abstract: A system and method for information communication between physically separated processor-based systems. Disclosed is a centralized communication array providing point to multipoint information communication between processor-based systems utilizing communication nodes. Such information communication may be between two processor-based systems, each utilizing communication nodes or may be between a processor-based system utilizing a communication node and a processor-based system coupled to the centralized communication array through a backbone.

Abstract: The present invention relates to air-link protocols which optimally permit wireless communication in a point-to-multipoint communication system. The protocols include establishment of an adaptive time division duplex channel, dynamic allocation of bandwidth, provision of multiple modulation schemes within the TDD operation, and bandwidth allocation.

Abstract: A method for transmitting a data signal where the data signal includes a preamble portion preceding a payload portion that reduces harmonic spikes is presented. The method reduces the transmission power for portions of bursty data signal that contain highly correlated or repetitive preamble sequences relative to the transmission power that contain non-highly correlated or repetitive payload sequences. The resultant average output power of the preamble sequences is approximately equal to the average output power of the payload sequences.

Abstract: Systems and methods for efficiently utilizing spectrum in a time division duplex system are shown. In the preferred embodiment fractions of a time division duplex frame are asymmetrically adjusted as forward and reverse channels according to communication demands/requests. Particular groups of resources for which independent asynchronous operation would result in undesired consequences are preferably operated in lockstep to thereby avoid the undesired consequences. Accordingly, a most preferred embodiment of the present invention provides for lockstep asymmetric adaptive time division duplexing among multiple carriers of a hub and multiple node wireless communication system.

Abstract: Disclosed is a system and method for optimizing capacity in a multi-user time division duplex (“TDD”) communication system such as a broadband wireless radio frequency communication system. More specifically the invention minimizes guard time in duplexed signals to thereby allow for higher data throughput which results in an increase in system communication capacity. Depending upon instantaneous traffic load associated with the subscribers using a particular TDD carrier, guard times may be adjusted to provide a desired level of throughput. As traffic loads demand, the order of assignment of burst periods in either or both the transmit and receive frames of a TDD carrier with respect to the subscriber systems operable thereon are adjusted to accommodate desired guard times.

Abstract: A system and method for providing adjustable levels of information density in a communicated data stream in response to monitored communication link conditions is disclosed. In a preferred embodiment the data stream is a time division multiple access data stream providing data communication to a plurality of geographically separated systems. The information density of time bursts associated with each such system may be independently adjusted according to the disclosed invention based upon each such system's link conditions. A preferred embodiment of the invention utilizes a mapping technique in order to utilize a modulator adjusted for a high level information density to emulate lower level information density transmission.

Abstract: A system and method for information communication between physically separated processor-based systems. Disclosed is a centralized communication array providing point to multipoint information communication between processor-based systems utilizing communication nodes. Such information communication may be between two processor-based systems, each utilizing communication nodes or may be between a processor-based system utilizing a communication node and a processor-based system coupled to the centralized communication array through a backbone.