Digital minimum shift keyed modulator

Details Digital minimum shift keyed modulator Digital minimum shift keyed modulator

1984-12-17

1987-03-03

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 64, 332 16R, H04L 2712

Patent

active

046480994

ABSTRACT:
A digital minimum shift keyed modulator (MSK) has been described incorporating a code generator for generating a plurality of bits in series representative of a spreading function, an Exclusive OR circuit for multiplying two successive bits, a memory for holding predetermined constants, timing circuitry, a digital-to-analog voltage converter and a bandpass filter. The invention overcomes the problem of variations over frequency and temperature associated with previous MSK modulator designs.

REFERENCES:
patent: 4327439 (1982-04-01), Gockler et al.
patent: 4500856 (1985-02-01), Childs
patent: 4539533 (1985-09-01), French
Digital Communications by Satellite, Bhargaua et al., Wiley & Sons, 1981, Chapter 9, Section 9.1.
W. R. Smith, "SAW Filters for CPSM Spread-Spectrum Communications:"-Hughes Aircraft Co., dated-1977 Ultrasonics Symposium Proceedings, IEEE Group on Sonics & Ultrasonics, Oct. 26-28, 1977 at Phoenix, Arizona, pp. 524-528.

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