.pi./4 shift QPSK modulator and communication apparatus

Details .pi./4 shift QPSK modulator and communication apparatus .pi./4 shift QPSK modulator and communication apparatus

1991-02-12

1993-05-11

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

332103, H04L 2720

Patent

active

052107752

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), Gocker et al.
patent: 4962510 (1990-10-01), McDavid et al.

Affiliated with

Also associated with

Rating

.pi./4 shift QPSK modulator and communication apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with .pi./4 shift QPSK modulator and communication apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and .pi./4 shift QPSK modulator and communication apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1356722