Modulation/demodulation method and system for realizing quadratu

Details Modulation/demodulation method and system for realizing quadratu Modulation/demodulation method and system for realizing quadratu

1994-02-18

1995-12-05

Pascal, Robert J.

Demodulators

Phase shift keying or quadrature amplitude demodulator

329305, H03D 300

Patent

active

054732808

ABSTRACT:
In a complex modulation/demodulation method and system, the data frequency f.sub.C1 of data signals I and Q inputted to a constellation mapping circuit is converted by a digital interpolation circuit into a sampling frequency f.sub.C2 equal to f.sub.S /N, where f.sub.S is an operation sampling frequency and N is selected such that the signal maximum frequency of the data signals I and Q becomes lower than f.sub.C2 /2. The interpolated data signals I and Q are respectively inputted to real and imaginary input terminals of a complex coefficient band pass filter to extract a real signal output. An output signal of the complex coefficient band pass filter is converted by a DA converter into an analog signal from which desired frequency components are extracted by an analog band pass filter, thereby performing a quadrature modulation.

REFERENCES:
patent: 4990867 (1991-02-01), Ogura et al.
patent: 5172070 (1992-12-01), Hiraiwa et al.
patent: 5179360 (1993-01-01), Suzuki

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