Subrate preamble decoder for a high speed modem

Details Subrate preamble decoder for a high speed modem Subrate preamble decoder for a high speed modem

1987-06-30

1989-01-03

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 8, 375 13, 375 84, 34082521, 34082558, 329120, H04L 512, H04B 138

Patent

active

047962798

ABSTRACT:
In a communication system, a plurality of remote modems send streams of data to a local modem, each remote modem preceding its transmission with a unique preamble consisting of phase reversed signals. At the local modem a preamble decoder detects the phase reversals of received signals without requiring channel equalization and the local modem uses this information for system setup.

REFERENCES:
patent: 3978407 (1976-08-01), Forney, Jr. et al.
patent: 3993956 (1976-11-01), Gilmore et al.
patent: 4034305 (1977-07-01), Sato
patent: 4245345 (1981-01-01), Gitlin et al.
patent: 4308618 (1981-12-01), Levy et al.
"10.2 Digital Modulation", Communication Systems, Carlson, McGraw-Hill, 1975, pp. 389-391.

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