Precision symbol discrimination timing detection (clock recovery

Details Precision symbol discrimination timing detection (clock recovery Precision symbol discrimination timing detection (clock recovery

1995-11-03

1998-04-28

Chin, Stephen

Pulse or digital communications

Synchronizers

Synchronizing the sampling time of digital data

H04L 700

Patent

active

057455350

ABSTRACT:
A provisional symbol discrimination timing detection unit detects a provisional symbol discrimination timing of a received signal modulated by a multi-subcarrier modulation scheme. A provisional symbol extraction unit demodulates the received signal and outputs, as a provisional demodulated symbol, a demodulated signal value of the provisional symbol discrimination timing of the demodulated signal for each subcarrier, demodulated signal being obtained by quadrature-demodulating the received signal. A phase difference detection unit detects a phase difference between the phase of the output provisional demodulated symbol of the received signal at a predetermined position and the phase of a reference symbol at this position. A symbol discrimination timing correction unit obtains a time difference between the provisional discrimination timing and the reference symbol discrimination timing on the basis of a subcarrier frequency and the detected phase difference for each subcarrier and corrects the provisional symbol discrimination timing on the basis of the time difference.

REFERENCES:
patent: 5228062 (1993-07-01), Bingham
Digital MCA System RCR Standard STD-32, pp. 1-30; Research & Development Center for Radio System (in Japan), published on Mar. 17, 1993.

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