Differentiate and multiply based timing recovery in a quadrature

Details Differentiate and multiply based timing recovery in a quadrature Differentiate and multiply based timing recovery in a quadrature

1999-05-24

2000-10-03

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

329306, 329307, 375261, 375325, 375329, 375344, H03D 300, H04L 27227, H04L 2738

Patent

active

06127884&

ABSTRACT:
A differentiate and multiply based timing recovery in a quadrature demodulator. A quadrature-modulated signal is received and demodulated by quadrature mixing the received modulated signal with a local oscillator signal. In-phase and quadrature down-converted signals are sampled. The sampled signals are differentially detected to produce binary digits from symbols conveyed by the quadrature-modulated signal. Sampling is controlled by a symbol timing recovery signal derived from the in-phase and quadrature down-converted signal. Thereto, the respective in-phase and quadrature down-converted signals are differentiated with respect to time, the respective differentiated signals are multiplied by the quadrature and in-phase signals, respectively, and the multiplied signals are subtracted from each other so as to produce a difference signal. The difference signal controls the symbol timing recovery in that a clock signal controlling the timing of the sampling is locked to the difference signal.

REFERENCES:
patent: 3590386 (1971-06-01), Tisi et al.
patent: 4766392 (1988-08-01), Moore
patent: 5079513 (1992-01-01), Noguchi et al.
By L. E. Larson, "RF and Microwave Circuit Design for Wireless Communications", Artech House, Inc., 1996, pp. 193-203.

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