Pulse or digital communications – Repeaters – Testing
Patent
1981-01-22
1982-11-09
Bookbinder, Marc E.
Pulse or digital communications
Repeaters
Testing
332 10, 375 39, 375 43, H04B 104, H04B 1200
Patent
active
043588530
ABSTRACT:
A data modulator for transmitting a first sequence of data symbols at a symbol rate of 1/T, the modulator being characterized as having a carrier frequency of f.sub.c Hz and the data symbols being denoted as x(kT), where x(kT) is a real or complex number and k is the time index of the kth symbol, featuring, in one aspect, modulated signal generating means for receiving the first sequence and generating, in response thereto and at the symbol rate, a second sequence of complex-valued signals y(kT), the signal y(kT) representing the complex number y(kT)=x(kT).multidot.exp (j2.pi.f.sub.c kT), where j=.sqroot.-1, and filter means for receiving the second sequence and generating, in response thereto, a third sequence of real-valued signals, at a rate higher than the symbol rate, the third sequence representing linear combinations of the real and imaginary parts of the second sequence of complex-valued signals y(kT).
REFERENCES:
patent: 3128342 (1964-04-01), Baker
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patent: 3825834 (1974-07-01), Stuart et al.
patent: 3887768 (1975-06-01), Forney, Jr. et al.
patent: 3988540 (1976-10-01), Scott et al.
patent: 4092618 (1978-05-01), Guidoux
patent: 4107470 (1978-08-01), Maruta
patent: 4123710 (1978-10-01), Stuart et al.
patent: 4313202 (1982-01-01), Kameya
Bookbinder Marc E.
Codex Corporation
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