Xocyst Transfer Ag L.l.c.

Other

Motorola Corporation

Itt Industries, Inc.

Conexant Systems, Inc.

Sicom, Inc.

Daniel D Shearer, Iii

Mark A Webster

Ronald Duane McCallister

Steven D Halford

Alex C Yeh

Donald John Rasmussen

Deniz Rende

Timothy P Dempsey

A method and system provides a way to achieve very high data rate expanded bandwidth (wide band) WLAN operations reusing existing single channel radio designs. The system provides a dual-channel form of operation for greater flexibility and performance across multiple platforms. Further, the system provides adaptive anti-aliasing techniques for eliminating aliasing due to adjacent channel waveform effects. These techniques mesh with existing systems cleanly.

Method and system for high data rate multi-channel WLAN architecture

Disclosed herein are various embodiments of methods, systems, and apparatus for increasing packet generation in a digital communication system. In one exemplary method embodiment, multiple input signals are interpolated, shifted, and aggregated into a composite signal for transmission over a network.

Packet generation systems and methods

An adaptive frequency equalization system providing an equalizer that has programmable taps that adjusts magnitude and phase of symbol information of a received signal and that provides equalized symbol information. The system includes a hard decision circuit that selects ideal symbol values using the equalized symbol information. A frequency response circuit determines frequency response update values using the ideal symbol values and the received signal. An adjust circuit updates stored frequency response information using the frequency response update values, and also updates the programmable taps of the equalizer using the stored frequency response information.

Adaptive frequency equalizer

Disclosed herein are various embodiments of methods, systems, and apparatus for increasing packet generation in a digital communication system. In one exemplary method embodiment, subcarriers are added to a packet in a wireless local area network transmission to increase the data rate.

Systems and methods of convergence beamforming are disclosed. One method embodiment, among others, comprises receiving N data streams from at least N+1 antennas, where N is an integer greater than 1; determining signal characteristics of each received data stream; and adjusting the signal characteristics of N data streams to be transmitted based on the determined signal characteristics of the received N data streams. The convergence beamforming may be achieved by the orthogonalization of received multipath channel vectors. The transmission signals from a station are adjusted corresponding to the channel characteristics of the signals received by that station.

Beamforming systems and methods

A modulator device is disclosed for a spread spectrum communication system which generates a modulated signal from incoming data. The device includes a QPSK portion for separating the incoming data into two data channels and for further spreading the two channels over a wide bandwidth according to a predetermined spreading code. A phase mapping element coupled to the QPSK portion for processing both channels in order to minimize spectral regrowth of the modulated signal by preventing the RF envelope deviation from going close to zero. Pulse shaping elements coupled to the phase mapping element for further processing each channel in order to improve the modulator spectral efficiency and minimize adjacent channel interference. A quad-mixer coupled to the pulse shaping elements for combining both channels into a recombined signal and for further modulating the recombined signal according to a predetermined carrier frequency.

QPSK/QBL-MSK waveform enhancement

This disclosure relates to a technique for estimating the characteristics of a propagation channel by processing a cyclostationary signal which has passed through it. The technique extends to the use of this estimate to reduce the impact of the channel distortion on the recovered signal. Unique features of this technique include its ability to function even when strong interference is present with the cyclostationary signal of interest.

Compensating for distortion in a communication channel

A numerically controlled oscillator wherein only one quadrant of a sinusoidially shaped wave is stored in a read-only-memory and the address of the read-only-memory is generated so that the entire numerically controlled oscillator and the read-only memory are contained on a single semiconductor chip. The data required to reproduce the quadrant is stored in a decomposed format so as to reduce the size of the read-only-memory.

Growing community of inventors

Scottsdale, AZ, United States of America

Daniel D Shearer, Iii