8-Phase PSK modulator

Details 8-Phase PSK modulator 8-Phase PSK modulator

1978-05-26

1979-09-18

Griffin, Robert L.

Telegraphy

Systems

Alternating or pulsating current

325 38R, 332 16R, H04L 2724

Patent

active

041683978

ABSTRACT:
This 8-phase modulator comprises logic circuitry for converting tribits XYZ of input data into binary control signals D1, D2, D3 and D4 according to a prescribed plan, a pair of 4-phase signal generators responsive to associated pairs of control signals, and a signal source producing a pair of equal amplitude carrier signals of the same frequency and of phases which differ by 45.degree. for driving associated ones of the 4-phase generators 45.degree. out-of-phase. Equal amplitude vector signals from the two 4-phase generators are combined to produce a resultant vector signal which individually generates the phasors of an 8-phase signal set.

REFERENCES:
patent: 3845412 (1974-10-01), Rearwin
patent: 3909721 (1975-09-01), Bussgang
Bennett and Davey "Data Transmission" pp. 202-203, McGraw-Hill.
"Modulating and Filtering for Three b/Hz Operation at 6 GHz" Wood, Communication News, Oct. 77, pp. 60-61.

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