Method and apparatus for detecting an equalizer training period

Details Method and apparatus for detecting an equalizer training period Method and apparatus for detecting an equalizer training period

1984-03-16

1986-08-12

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

333 18, 364724, 375103, H03H 730, H03K 5159

Patent

active

046060456

ABSTRACT:
Apparatus, and a related method, for fast carrier acquisition in a modem. The apparatus includes circuitry to speed carrier acquisition by the determination of which of two alternate phasors is being received during a baud synchronization period of a signal preamble before data transmission. Another aspect of the invention involves the use of a complex matched filter for the determination of the start of an equalizer training sequence in the signal preamble. The output of the matched filter exhibits a deep null at the start of the training sequence, since the beginning of the sequence bears an inverse relationship to the end of the preceeding baud synchronization period.

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patent: 4320517 (1982-03-01), Godard et al.
patent: 4433425 (1984-02-01), de Jaeger

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