Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1990-03-21
1991-12-03
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
375103, 328149, 36472401, H04B 110
Patent
active
050705164
ABSTRACT:
The invention relates to filtering a periodic digital signal having N logic levels and having noise superposed thereon. The instantaneous probability of existence of each of these logic levels is converted into a corresponding one of N signals each having its own maximum amplitude when the modulated value of the received instantaneous signal is equal to the normal value for a corresponding logic level, which amplitude falls off by application of a weighting coefficient as the received instantaneous value moves away from the normal value of that logic level. The signal relating to each looked-for logic level is integrated over the duration of an elementary modulation period in the received digital signal, and the recognized logic level is the level corresponding to the largest value integral.
REFERENCES:
patent: 4317080 (1982-02-01), Acker
patent: 4375037 (1983-02-01), Ikushima
patent: 4766600 (1988-08-01), Martin
patent: 4816769 (1989-03-01), Ma et al.
patent: 4823360 (1989-04-01), Tremblay et al.
patent: 4835790 (1989-05-01), Yoshida et al.
JS Telecom
Safourek Benedict V.
Tse Young
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