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.