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：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.