Digital quadriphase-shift keying modulator

Details Digital quadriphase-shift keying modulator Digital quadriphase-shift keying modulator

1994-10-13

1996-06-04

Mis, David

Modulators

Phase shift keying modulator or quadrature amplitude modulator

332104, 375279, 375281, 375308, H03C 300, H04L 2718, H04L 2720

Patent

active

055237266

ABSTRACT:
A digital quadriphase-shift keying modulator is described which generates a modulated intermediate carrier frequency (IF) based on a desired number of samples for each input information bit. The design includes a ROM (or RAM) look-up table which stores digitized waveforms. The inphase and quadrature components of a complex baseband signal are translated to an IF at a multiple of the sampling rate simply by alternating the inphase and quadrature samples and alternating signs. The real IF output is produced by summing the inphase and quadrature signals.

REFERENCES:
patent: 4143322 (1979-03-01), Shimamura
patent: 4318049 (1982-03-01), Mogenson
patent: 4466108 (1984-08-01), Rhodes
patent: 4787096 (1988-11-01), Wong
patent: 4879728 (1989-11-01), Tarallo
patent: 5285479 (1994-02-01), Iwane
Connelly, "Design of the Westinghouse Series 1000 Mobile Phone," IEEE, pp. 347-350, May 18, 1993.
Connelly, "The Westinghouse Series 1000 Mobile Phone: Technology and Applications," IEEE, pp. 375-379, May 18, 1993.

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