All-digital method and apparatus for demodulating an analog sign

Details All-digital method and apparatus for demodulating an analog sign All-digital method and apparatus for demodulating an analog sign

1993-07-20

1995-09-05

Chin, Stephen

Pulse or digital communications

Receivers

Interference or noise reduction

375316, H04B 110, H04L 2706

Patent

active

054485967

ABSTRACT:
For digitally demodulating a PSK analog signal transmitted as a linearly modulated carrier and representing successive symbols at a rate 1/T, the signal is sampled at a rate 1/.tau. at least twice the symbol rate 1/T, successive samples sampled with different filters selected from a plurality of filters corresponding to instants of no IES that are mutually offset by a fraction of the sampling .tau. that is optimum as regards coincidence between the respective sampling instant and an instant at which there is no ISI. A mean symbol demodulation rate equal to the symbol transmission rate is however retained. The signal as delivered by the selected filters in succession is decoded.

REFERENCES:
patent: 4800574 (1989-01-01), Tanaka et al.

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