Symbol timing detecting circuit

Details Symbol timing detecting circuit Symbol timing detecting circuit

1992-11-30

1994-08-30

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

375 86, 375118, H04L 7027

Patent

active

053435028

ABSTRACT:
An amplitude detection circuit generates an amplitude signal by detecting an amplitude of a received signal modulated by .pi./4 shift QPSK , and a first shift register and all amplitude difference detection circuit calculate an amplitude difference signal from the amplitude signal. Then, a second shift register and a calculation circuit calculate an amplitude difference accumulation signal from the amplitude difference signal, and a decision circuit generates a preset signal by deciding a sampling time from the amplitude difference accumulation signal and a preset signal. A counter divides a master clock signal by the preset signal, thereby generating a symbol clock signal.

REFERENCES:
patent: Re34206 (1993-03-01), Sayar
patent: 3599103 (1971-08-01), LeGarde
patent: 4128828 (1978-12-01), Samejima et al.
patent: 4672447 (1987-06-01), Moring et al.
patent: 4941155 (1990-07-01), Chuang et al.
patent: 5122758 (1992-06-01), Tomita
patent: 5235622 (1993-08-01), Yoshida
patent: 5243630 (1993-09-01), Rhebergen

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