Digitized quadrature phase shift keying modulator

Details Digitized quadrature phase shift keying modulator Digitized quadrature phase shift keying modulator

1987-02-17

1988-07-05

Masinick, Michael A.

Pulse or digital communications

Repeaters

Testing

332 16R, H04L 2710

Patent

active

047560088

ABSTRACT:
A digitized quadrature phase shift keying modulator capable of making the modulation output frequency variable and sufficing a single ROM of waveform shaping digital filter with look-up table by using interpolators which re-sample waveforms of impulse response of each of the output I data and Q data from the digital filter to change the sampling rate and extractors for extracting the interpolated I data and Q data so that samples of each of the interpolated I data and Q data occur sequentially and alternately at different timings.

REFERENCES:
patent: 3787785 (1974-01-01), Bass
patent: 3935386 (1976-01-01), Glasson et al.
patent: 4003001 (1977-01-01), Jones, Jr.
patent: 4404532 (1983-09-01), Welti
patent: 4613976 (1986-09-01), Sawerinson et al.
patent: 4626803 (1986-12-01), Holm
Boutin et al, "A Digital Filter-Modulation Combination for Data Transmission", IEEE Tran. on Communications, vol. COM 25, No. 10, Oct. 1977, pp. 1242-1244.

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