公开(公告)号：JP2002314508A

公开(公告)日：2002-10-25

申请号：JP2002066748

申请日：2002-03-12

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SARRAF MOHSEN

IPC: H04J14/00 ,  H04J14/02

Abstract: PROBLEM TO BE SOLVED: To provide a method and apparatus that carries a frequency component of information bits of M channels that is distributed into N wavelengths of a WDM distributed optical signal so as to ensure transmission of information. SOLUTION: The apparatus of this invention comprises an optical Fourier transform element and a multiplexer. A wavelength division multiplexed(WDM) optical signal comprising M channels is applied to the optical Fourier transform element. The optical Fourier transform element distributes the information bits on each of the M channels across N wavelengths (or channels), where N>=M. The resulting N optical channels are inputted to the multiplexer, which provides an optical WDM distributed optical signal comprising N channels. Thus, the frequency components of the information bits of the original M channels are carried over the N wavelengths of the WDM distributed optical signals.

公开(公告)号：JP2001057577A

公开(公告)日：2001-02-27

申请号：JP2000174767

申请日：2000-06-12

Applicant: LUCENT TECHNOLOGIES INC

Inventor： GOEDDEL THOMAS W ,  MATUSEVICH ALEX ,  SARRAF MOHSEN ,  TOBIAS JONATHAN M ,  TSAI SHENG

IPC: H04L27/18 ,  H04L7/033 ,  H04L27/22

Abstract: PROBLEM TO BE SOLVED: To synchronize a sample process with a receiving symbol by providing a means using the measured value of the frequency of a phase modulation signal in order to control sample timing for sampling a demodulation symbol, etc. SOLUTION: The 2nd part of a QPSK signal is made to pass through an FM demodulator 120 and generates the measured value of an instantaneous frequency being a phase derivative value from a phase including transmitted data. The measured value of the frequency is used for controlling sample timing, and subsequently, an instantaneous frequency output from the demodulator 120 is added to a peak detector 124. The detector 124 generates a signature to be added to a digital signal processor 126. The processor 126 generates an appropriate sample timing signal by using the signature and gives it to a sample timing generator 128.

公开(公告)号：DE60035548D1

公开(公告)日：2007-08-30

申请号：DE60035548

申请日：2000-05-31

Applicant: LUCENT TECHNOLOGIES INC

Inventor： GOEDDEL THOMAS W ,  MATUSEVICH ALEX ,  SARRAF MOHSEN ,  TOBIAS JONATHAN M ,  TSAI SHENG-JEN

IPC: H04L7/033 ,  H04L27/18 ,  H04L27/22 ,  H04L27/233

Abstract: A phase-modulated signal such as a quadrature phase-shift-keyed (QPSK) signal in a wireless communication system is demodulated using sample timing based at least in part on frequency information generated by frequency demodulating the phase-modulated signal. The phase-modulated signal is separated into first and second portions, the first portion is phase demodulated to generate demodulated symbols, and the second portion is frequency demodulated to generate, e.g., a measure of the instantaneous frequency of the phase-modulated signal. The instantaneous frequency measure is processed to identify one or more symbol transitions, and the identified transitions are used to establish the sample timing such that proper sampling of the symbols is ensured.

公开(公告)号：CA2310368C

公开(公告)日：2003-12-02

申请号：CA2310368

申请日：2000-05-31

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SARRAF MOHSEN ,  TOBIAS JONATHAN MICHAEL ,  TSAI SHENG-JEN ,  MATUSEVICH ALEX ,  GOEDDEL THOMAS WILLIAM

IPC: H04L27/18 ,  H04L7/033 ,  H04L27/22

Abstract: A phase-modulated signal such as a quadrature phase-shift-keyed (QPSK) signal in a wireless communication system is demodulated using sample timing based at least in part on frequency information generated by frequency demodulating the phase- modulated signal. The phase-modulated signal is separated into first and second portions, the first portion is phase demodulated to generate demodulated symbols, and the second portion is frequency demodulated to generate, e.g., a measure of the instantaneous frequency of the phase-modulated signal. The instantaneous frequency measure is processed to identify one or more symbol transitions, and the identified transitions are used to establish the sample timing such that proper sampling of the symbols is ensured.

公开(公告)号：CA2380121C

公开(公告)日：2008-07-08

申请号：CA2380121

申请日：2002-04-04

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SARRAF MOHSEN

IPC: H04J14/00 ,  H04J14/02 ,  H04B10/155

Abstract: An apparatus provides an optical wavelength division multiplexed signal having 2M optical channels such that each of M information-bearing signals are differently encoded onto 2 of the 2M optical channels. In particular, the apparatus comprises M inverters, 2M electrical-to-optical converters and a multiplexer. Each electrical-to-optical converter provides an optical signal at a different one of 2M wavelenghts. The apparatus receives the M information-bearing signals and (a) creates M optical signals, each at a different wavelength, by converting each of the M information bearing signals onto the optical domain via M of the 2M electrical-to-optical converters, and (b) creates M inverted optical signals, each at a different wavelength, by first inverting each of the M information bearing signals (via the M inverters) before conversion into the optical domain via the remaining M electrical-to- optical converters. The M optical signals along with the M inverted optical signals are then applied to the multiplexer, which provides an optical wavelength division multiplexed (WDM) signal having 2M channels.

公开(公告)号：DE60035548T2

公开(公告)日：2008-03-20

申请号：DE60035548

申请日：2000-05-31

Applicant: LUCENT TECHNOLOGIES INC

Inventor： GOEDDEL THOMAS W ,  MATUSEVICH ALEX ,  SARRAF MOHSEN ,  TOBIAS JONATHAN M ,  TSAI SHENG-JEN

IPC: H04L7/033 ,  H04L27/18 ,  H04L27/22 ,  H04L27/233

Abstract: A phase-modulated signal such as a quadrature phase-shift-keyed (QPSK) signal in a wireless communication system is demodulated using sample timing based at least in part on frequency information generated by frequency demodulating the phase-modulated signal. The phase-modulated signal is separated into first and second portions, the first portion is phase demodulated to generate demodulated symbols, and the second portion is frequency demodulated to generate, e.g., a measure of the instantaneous frequency of the phase-modulated signal. The instantaneous frequency measure is processed to identify one or more symbol transitions, and the identified transitions are used to establish the sample timing such that proper sampling of the symbols is ensured.

公开(公告)号：CA2380121A1

公开(公告)日：2002-11-25

申请号：CA2380121

申请日：2002-04-04

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SARRAF MOHSEN

IPC: H04J14/00 ,  H04B10/155 ,  H04J14/02

Abstract: An apparatus provides an optical wavelength division multiplexed signal having 2M optical channels such that each of M information-bearing signals are differently encoded onto 2 of the 2M optical channels. In particular, the apparatus comprises M inverters, 2M electrical-to-optical converters and a multiplexer. Each electrical-to-optical converter provides an optical signal at a different one of 2M wavelenghts. The apparatus receives the M information-bearing signals and (a) creates M optical signals, each at a different wavelength, by converting each of the M information bearing signal s onto the optical domain via M of the 2M electrical-to-optical converters, an d (b) creates M inverted optical signals, each at a different wavelength, by first inverting each of the M information bearing signals (via the M inverters) before conversion into the optical domain via the remaining M electrical-to- optical converters. The M optical signals along with the M inverted optical signals are then applied to the multiplexer, which provides an optical wavelength division multiplexed (WDM) signal having 2M channels.

公开(公告)号：CA2310368A1

公开(公告)日：2000-12-10

申请号：CA2310368

申请日：2000-05-31

Applicant: LUCENT TECHNOLOGIES INC

Inventor： GOEDDEL THOMAS WILLIAM ,  TSAI SHENG-JEN ,  SARRAF MOHSEN ,  TOBIAS JONATHAN MICHAEL ,  MATUSEVICH ALEX

IPC: H04L27/18 ,  H04L7/033 ,  H04L27/22

Abstract: A phase-modulated signal such as a quadrature phase-shift-keyed (QPSK) signal in a wireless communication system is demodulated using sample timing based at least in part on frequency information generated by frequency demodulating the phasemodulated signal. The phase-modulated signal is separated into first and second portions, the first portion is phase demodulated to generate demodulated symbols, and the second portion is frequency demodulated to generate, e.g., a measure of the instantaneous frequency of the phase-modulated signal. The instantaneous frequency measure is processed to identify one or more symbol transitions, and the identified transitions are used to establish the sample timing such that proper sampling of the symbols is ensured.