Modem signal acquisition technique

Details Modem signal acquisition technique Modem signal acquisition technique

1982-08-02

1984-07-24

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 81, 328155, H03D 322

Patent

active

044621086

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.

REFERENCES:
patent: 3978407 (1976-08-01), Forney, Jr. et al.
patent: 4004226 (1977-01-01), Qureshi et al.
patent: 4079329 (1978-03-01), England et al.
patent: 4317210 (1982-02-01), Dekker et al.

Affiliated with

Also associated with

Rating

Modem signal acquisition technique does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Modem signal acquisition technique, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modem signal acquisition technique will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-100109