Pulse or digital communications – Repeaters – Testing
Patent
1980-11-06
1982-05-18
Ng, Jin F.
Pulse or digital communications
Repeaters
Testing
375 86, 333 18, H04B 314, H03H 730, H04L 2503
Patent
active
043308619
ABSTRACT:
A signal receiver of a QPSK data-transmission system comprises two noncoherent demodulators feeding digitized in-phase and quadrature components to a pair of transversal filters whose coefficients are read out, during successive keying intervals, from a read/write memory accessed by an arithmetic unit which generates corrective terms updating these coefficients. A comparator in the output of each filter detects estimated phase jumps between delayed and undelayed filtered samples of each signal component and delivers them to a decision circuit as well as to an error detector which also receives quantized output signals from the decision circuit to produce two error signals fed to the arithmetic unit; the latter further receives the delayed and undelayed filtered samples as well as ancillary data temporarily stored in these filters to calculate the corrective terms.
REFERENCES:
patent: 3787762 (1974-01-01), Sato
patent: 3878468 (1975-04-01), Falconer
patent: 3935535 (1976-01-01), Motley et al.
patent: 4029903 (1977-06-01), Tamburelli
patent: 4061978 (1977-12-01), Motley et al.
patent: 4076956 (1978-02-01), Dogliotti et al.
Impallomeni Enrico
Montagna Roberto
CSELT - Centro Studi e Laboratori Telecomunicazioni S.P.A.
Ng Jin F.
Ross Karl F.
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