Multivalue digital transmission system

Details Multivalue digital transmission system Multivalue digital transmission system

1997-05-14

1998-09-29

Pham, Chi H.

Pulse or digital communications

Receivers

Automatic frequency control

375345, 4552341, H04L 2706

Patent

active

058155368

ABSTRACT:
A multivalue digital transmission system performs a stable AGC operation. The system performs the operations of: converting information data to be transmitted into a multivalue symbol sequence; adding an area comprising a binary symbol sequence, which does not depend on the information data, to the multivalue symbol sequence in a periodic manner, and transmitting a resultant signal after converting it to a multivalue digital modulation signal; detecting the binary symbol area from a demodulation signal obtained by demodulating an IF signal converted from the multivalue digital modulation signal; and performing a gain control of the IF signal based on a signal level of the demodulation signal obtained during a detection period of said binary symbol area.

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patent: 5646935 (1997-07-01), Ishikawa et al.
patent: 5671253 (1997-09-01), Stewart

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