Nortel Networks Corporation

Apple Inc.

Northern Telecom Limited

Ciena Corporation

Rockstar Consortium US LP

Telefonaktiebolaget Lm Ericsson (publ)

Bell-northern Research Ltd.

Ciena Luxembourg S.a.r.l.

Leo L Strawczynski

Wen Tong

Kim Bryon Roberts

Shalini Suresh Periyalwar

Claude Royer

Shiquan Wu

David G Steer

Maurice M O'Sullivan

John Duncan McNicol

Kieran Parsons

Howard Martin Sandler

J Michael Watters

Norman P Secord

Mo-Han Fong

Ahmad Jalali

Geng Wu

Rafi Rabipour

Bill W Gage

Gregory L Plett

Ning Guo

Farideh Khaleghi

Robert Matyas

Adrien Comeau

Andreas H Weirich

Howard M Sandler

Gregory Loren Plett

David Gwyn Steer

Chandra Sekhar Bontu

Nimal Gamini Senarath

Han Henry Sun

William Anthony Gage

James St Harley

Jorgen Staal Nielsen

Bassam M Hashem

James E Whiteaway

Genzao Zhang

Alberto Gutierrez

Paul Vincent Coverdale

Christopher R Fludger

Feng Shi

Peter E Chow

Bruce L Townsend

Wookwon Lee

John G Ellis

Bernard Thiboutot

Terrance W Taraschuk

Amir Bigloo

Okan Azmak

Dave Walker

Shirish A Altekar

Shalinl S Periyalwar

Bill (wa) Gage

Michäel Gazier

Hing-Fai Lee

Bill W A Gage

Jos&eacute; M Duran

Maurice O'sullivan

Terrance Taraschuk

Maurice S O'sullivan

John Mcnicol

A system and method for transmitting high speed data on fixed rate and for variable rate channels. The system and method provides the flexibility of adjusting the data rate, the coding rate, and the nature of individual retransmissions. Further, the system and method supports partial soft combining of retransmitted data with previously transmitted data, supports parity bit selection for successive retransmissions, and supports various combinations of data rate variations, coding rate variations, and partial data transmissions.

Hybrid ARQ schemes with soft combining in variable rate packet data applications

Generation of data streams for two dimensions comprises compensation for a nonideal response of a signal path in an optical communications signal. The data streams are converted to analog electrical signals which drive two dimensions of an electrical-to-optical converter. Output of the electrical-to-optical converter is coupled through an optical link to an optical-to-electrical converter.

Compensation of transmitter or receiver defects in an optical communications system

An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.

Adaptive time diversity and spatial diversity for OFDM

A compensation function mitigates a substantial portion of the dispersion imparted to a communications signal by an optical communications system. A digital input signal is digitally processed using the compensation function to generate a predistorted signal. An amplitude and a phase of an optical signal are modulated using a pair of orthogonal signal components to generate a predistorted optical signal for transmission. In one implementation, the pair of orthogonal signal components are components of the predistorted signal. In another implementation, the predistorted signal is processed using a non-linear compensator to generate a further distorted signal and the pair of orthogonal signal components are components of the further distorted signal. In that implementation, the non-linear compensator is configured to substantially compensate for nonlinearities in one or both of an optical modulator of a transmitter of the system and an optical-to-electrical converter of a receiver of the system.

Optical dispersion compensation in the electrical domain in an optical communications system

A compensation function mitigates a substantial portion of the chromatic dispersion imparted to a communications signal by an optical communications system. A digital input signal is digitally processed using the compensation function to generate a predistorted signal. An amplitude and a phase of an optical signal are modulated using a pair of orthogonal signal components to generate a predistorted optical signal for transmission. In one implementation, the pair of orthogonal signal components are components of the predistorted signal. In another implementation, the predistorted signal is processed using a non-linear compensator to generate a further distorted signal and the pair of orthogonal signal components are components of the further distorted signal. In that implementation, the non-linear compensator is configured to substantially compensate for nonlinearities in one or both of an optical modulator of a transmitter of the system and an optical-to-electrical converter of a receiver of the system.

Optical dispersion imposed on a communications signal conveyed through an optical communications system is compensated by modulating the communications signal in the electrical domain. A compensation function is determined that substantially mitigates the chromatic dispersion. The communications signal is then modulated in the electrical domain using the compensation function. In preferred embodiments, compensation is implemented in the transmitter, using a look-up-table and digital-to-analog converter to generate an electrical predistorted signal. The electrical predistorted signal is then used to modulate an optical source to generate a corresponding predistorted optical signal for transmission through the optical communications system.

The system and method of the present invention uses a plurality of carriers by assigning user terminals to the plurality of carriers so that a minimum grade of service is met and so that throughput is maximized. Each serviced user terminal reports the channel quality of each of a plurality of carriers to a servicing base station(s). The reported channel qualities are then converted to maximum supported data rates for each of the user terminals and each of the carriers. These data rates are then used to allocate data service levels and data rates for each of the user terminals so that a minimum grade of service is met for each of the user terminals. Forward link transmissions, e.g., frames/data packets carried on forward channels (F-CHs), are then constructed and transmitted to meet the allocations.

Multi-carrier arrangement for high speed data

Phase nonlinearities of an optical communications system are monitored by generating a test signal which includes a predetermined property that is uniquely associated with at least one phase nonlinearity of the optical communications system. The predetermined property of the test signal is then detected at a monitoring point of the optical communications system, and used to estimate the associated phase nonlinearity.

Monitoring phase non-linearities in an optical communication system

Growing community of inventors

Ottawa, Canada

Leo L Strawczynski