.pi./4 quadrature phase shift keying modulator

Details .pi./4 quadrature phase shift keying modulator .pi./4 quadrature phase shift keying modulator

1992-09-11

1994-12-13

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 54, 375 57, 375 60, 332103, H04L 2720

Patent

active

053735323

ABSTRACT:
A .pi./4 shift QPSK modulator includes a pre-processing part for subjecting an input transmitting code sequece to a pre-processing, a modulator part for selectively subjecting the transmitting code sequence received via the pre-processing part to a modulation in conformance with QPSK and a modulation in conformance with a .pi./4 shift QPSK, and an output part for outputting a modulated signal having a burst form based on an output of the modulator part depending on a burst signal having leading and trailing edges, where the pre-processing part carries out the pre-processing so that I-axis and Q-axis data supplied to the modulator part have the same symbol in succession at parts corresponding to the leading and trailing edges of the burst signal, so as to suppress generation of unwanted waves in the output part.

REFERENCES:
patent: 4483000 (1984-11-01), Yamamoto et al.
patent: 4644531 (1987-02-01), Sasaki
patent: 4962510 (1990-10-01), McDavid et al.
patent: 5210775 (1993-05-01), Takahara et al.
patent: 5222104 (1993-06-01), Medendorp

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