Symbol generator for phase modulated system

Details Symbol generator for phase modulated system Symbol generator for phase modulated system

1986-04-15

1988-05-17

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 67, 332 16R, 328 14, 364721, H04L 512

Patent

active

047456280

ABSTRACT:
A symbol generator is provided for generating a filtered analog waveform for use in phase modulating a carrier. A memory (30) is provided for storing predetermined waveform segments. The waveform segments are correlated with an input data stream. The data stream is converted to an address for the memory (30) to output a digital value to a D/A converter (122). The output of the D/A converter (122) is comprised of in-phase and quadrature-phase components which are input to a sample and hold circuit for generating the analog signals. The waveform segments are then sequentially assembled and input to a vector modulator (168).

REFERENCES:
patent: 3773975 (1973-11-01), Koziol
patent: 3935386 (1976-01-01), Glasson et al.
patent: 4339724 (1982-07-01), Feher
patent: 4346448 (1982-08-01), Insam et al.
patent: 4511862 (1985-04-01), Motiwala et al.
patent: 4567602 (1986-01-01), Kato et al.
patent: 4617535 (1986-10-01), Unerdem
"IEEE Transactions on Communications", vol. Com-31, No. 5, May 1983, pp. 702-707, by Kamilo Feher.

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