Initialization equalization for modulation and demodulation usin

Details Initialization equalization for modulation and demodulation usin Initialization equalization for modulation and demodulation usin

1995-07-21

1996-07-16

Chin, Stephen

Pulse or digital communications

Equalizers

Automatic

375222, 375266, 375326, 375344, 375345, 375348, 375349, 375368, 3701054, H03H 730

Patent

active

055374379

ABSTRACT:
A modulation and demodulation system suitable for use with a modem (modulator and demodulator apparatus) of a first polling type. The system allows reproduction of a signal necessary for initialization of a reception section of a modulator and demodulator apparatus with certainty in a short training time. The modulation and demodulation system is constructed such that, upon transmission of data, training data of a particular pattern are modulated and transmitted prior to transmission of the data, and such training data are demodulated by demodulation means and initialization of a reception section of the modulation and demodulation system is performed using the demodulation training data. The pattern of the training data to be transmitted includes an arrangement of signals wherein signals having phases different by 180.degree. from each other are arranged alternately, and a signal having the same phase as the last signal is arranged intermediately.

REFERENCES:
patent: 4571733 (1986-02-01), Kaku et al.
patent: 4577328 (1986-03-01), Senoo
patent: 4775985 (1988-10-01), Busby
patent: 4868850 (1989-09-01), Kaku et al.
patent: 5140619 (1992-08-01), Aubie et al.

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