Demodulator for a phase shift keying (PSK) signal

Details Demodulator for a phase shift keying (PSK) signal Demodulator for a phase shift keying (PSK) signal

1993-05-27

1996-04-09

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375330, H04L 2722, H03D 322

Patent

active

055068731

ABSTRACT:
A PSK signal demodulating apparatus having a clock extracting circuit. The clock extracting circuit includes a counter that is operable by a clock having a frequency N time the carrier frequency of a phase modulated signal such as a .pi./4 shift DQPSK modulated wave is latched at the leading edge timing of the above signal thereby to obtain phase data. Also, a difference between these phase data is calculated at mod.2.pi. thereby to extract a clock component.

REFERENCES:
patent: 4435687 (1984-03-01), Nadan et al.
patent: 4669095 (1987-05-01), Hall
patent: 5122758 (1992-06-01), Tomita
IEEE Transactions on Communications, vol. 28, No. 8, Aug., 1989; "Digital Phase Sampling For Microcomputer Implementation of Carrier Acquisition and Coherent Tracking", by Cahn & Leimer.
Telecommunications & Radio Engineering, vol. 40/41, No. 11, Nov., 1986, "PSK Signal Processing by Microprocessor" by Mokhov.
IEEE Global Telecommunications Conference, 2-5 Dec., 1990, San Diego, U.S.; "Digital Intermediate Frequency Demodulation Technique For Cellular Communication Systems", by Tomita, Yokoyama & Matsuki.

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