Differential phase shift keying modulator

Details Differential phase shift keying modulator Differential phase shift keying modulator

1987-03-04

1991-06-25

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

332103, H04L 2720

Patent

active

050273728

ABSTRACT:
A differential phase shift keying (DPSK) modulator utilizes time-domain filtering techniques. The DPSK modulator includes a data scrambler which receives a serial digital data input signal and generates an output signal representing the dibit value of the serial input sequence. The dibit signal is differentially encoded and then provided to a history generator which produces phase modulating vectors utilizing pulse density modulation (PDM). The carrier waveform is then modulated utilizing the modulating vectors to generate a DPSK output signal.

REFERENCES:
patent: 3958191 (1976-05-01), Jones, Jr.
patent: 4008373 (1977-02-01), Nash et al.
patent: 4206423 (1980-06-01), Nossen
patent: 4442530 (1984-04-01), Parrish, Jr. et al.
patent: 4504802 (1985-03-01), Heatherington
patent: 4583238 (1986-04-01), Boisseau et al.
patent: 4617535 (1986-10-01), Unerdem
patent: 4706261 (1987-11-01), Torre et al.

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