Modulators – Phase shift keying modulator or quadrature amplitude modulator
Patent
1993-05-05
1994-11-01
Grimm, Siegfried H.
Modulators
Phase shift keying modulator or quadrature amplitude modulator
332104, 375 54, 375 67, H04L 2720
Patent
active
053610474
ABSTRACT:
A .pi./4 shift QPSK modulator for receiving digital signals and for outputting a modulated signal therefrom in accordance with each of the inputted digital signals. The .pi./4 QPSK modulator is utilized in a communication apparatus and includes a counter for counting the number of the inputted digital signals, a phase information arithmetic unit for receiving a value of an output from the counter and a value of each of the inputted digital signals for outputting phase information of the signal to be modulated, an arithmetic unit for performing an arithmetic operation on values representing an impulse response of the output phase information from the phase information arithmetic unit and outputting impulse response values in accordance therewith, and an accumulating unit for accumulating impulse response values outputted from the arithmetic unit and for performing an arithmetic operation for enabling generation of a .pi./4 shift QPSK modulated signal.
REFERENCES:
patent: 4327439 (1982-04-01), Gockler et al.
patent: 4962510 (1990-10-01), McDavid et al.
Esaki Tomohiro
Okamoto Teiji
Sudo Shigeyuki
Takahara Yasuaki
Grimm Siegfried H.
Hitachi , Ltd.
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