Method and apparatus for detecting the training sequence for a s

Details Method and apparatus for detecting the training sequence for a s Method and apparatus for detecting the training sequence for a s

1981-12-09

1984-02-21

Ng, Jin F.

Pulse or digital communications

Spread spectrum

Direct sequence

375 13, 370107, H04L 710

Patent

active

044334257

ABSTRACT:
The method relates to the detection of the training sequence of a self-adapting equalizer at the receiver end of a synchronous data-transmission system, the training sequence being preceded a synchronizing transmission of data transformed on coding into a succession of multivalent symbols such that the transmitted signal has a frequency spectrum which is substantially a single large-amplitude spectrum line. The training sequence begins with the transmission of data transformed on coding and at least one null symbol. The method consists in detecting the presence of the large-amplitude spectrum line in the signal formed by the received but not yet equalized symbols by means of a digital filter 40 and in thereafter detecting the first following major drop in absolute amplitude of the signal that lasts throughout the duration of one symbol period. This is done by means of a low amplitude level detector 50. The invention applies to the detection of the training sequence for an equalizer in a system operating according to CCITT recommendation V 37.

REFERENCES:
patent: 3591720 (1971-07-01), Othmer
patent: 3823377 (1974-07-01), Keane et al.
patent: 4006352 (1977-02-01), Sato
patent: 4320517 (1980-03-01), Godard et al.
patent: 4361890 (1982-11-01), Green, Jr. et al.

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