Digital communication system

Details Digital communication system Digital communication system

1987-05-08

1989-06-20

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

332 9R, 375 86, 375101, H04L 2718

Patent

active

048415472

ABSTRACT:
A digital communication system, in which digital information is represented by a quaternary information symbol (11, 01, 00, 10) and the double step phase shift, each step represented by (.pi./4, 3.pi./4, 5.pi./4, 7.pi./4), is performed per 1/2 time slot in correspondence to each information symbol, so that the number of phase shift per unit time in the case of the identical transmission rate can be decreased to 1/2, as compared with a .DELTA..theta./2-DSK system, and expansion of the bandwidth can be decreased to 1/2.

REFERENCES:
patent: 4174505 (1979-11-01), Querry
patent: 4210879 (1980-07-01), Poitevin et al.
patent: 4417219 (1983-11-01), Brossard et al.
patent: 4726038 (1988-02-01), Ikegami et al.
Nossen and Volertas, "Unidirectional Phase Shift Keying", National Telecommunications Conference (Nov. 27-29, 1979), vol. 2, pp. 33.5.1-33.5.5.
Yoshida et al, "A Novel Anti-Multipath Modulation Technique DSK", IEEE Global Telecommunications Conference, Globecom '85 (Dec. 2-5, 1985), vol. 3, pp. 36.4.1-36.4.5.
Institute of Electronics and Communication Engineers, Japan, Aug. 30, 1984, "A Modulation Technique Suffering from Less Timing Fluctuation of Eye Patterns in Multipath Fading".

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