Frequency offset dealing modulator and demodulator apparatus

Details Frequency offset dealing modulator and demodulator apparatus Frequency offset dealing modulator and demodulator apparatus

1993-08-13

1995-08-08

Coles, Sr., Edward L.

Pulse or digital communications

Receivers

Automatic frequency control

375229, 455314, H04L 2706

Patent

active

054405890

ABSTRACT:
The invention provides a frequency offset dealing modulator and demodulator apparatus which modulates and demodulates transmission/reception data and is improved in that it can reproduce an accurate impulse when data are transmitted. The modulator and demodulator apparatus includes a modulator for modulating data, and a demodulator for demodulating a receive signal to reproduce such data. The demodulator includes a demodulation processing unit, a roll-off filter, a receive level adjustment unit, an equalizer, a carrier frequency offset removing correction signal generation unit, a normalizer, a multiplier and a sum calculation unit.

REFERENCES:
patent: 4097807 (1978-06-01), Fujimura
patent: 5121414 (1992-06-01), Levine et al.
patent: 5249205 (1993-09-01), Chennakeshu et al.
patent: 5283813 (1994-02-01), Shalvi et al.
patent: 5287388 (1994-02-01), Ogura et al.

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