Digital signal communication system for multi-level modulation i

Details Digital signal communication system for multi-level modulation i Digital signal communication system for multi-level modulation i

1983-02-11

1985-06-11

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 25, 371 37, G06F 1112

Patent

active

045233233

ABSTRACT:
A digital signal communication system has a transmitter for differentially converting first digital signals of n trains (n is an integer of 3 or larger) into a second digital signal of n trains comprising a plurality of words. Responsive to the second digital signals, a modulated signal is provided with 2.sup.n (=N) modulation levels, which are transmitted. A receiver responds to the modulated signals, and demodulates them to provide signals of n trains corresponding to the second digital signals. This demodulated signal is differentially converted to provide n trains of signals corresponding to the first digital signals. The Hamming distance between two words of said second digital signals corresponding to the adjacent two modulation levels is either 1 or 2 and the numbers of the Hamming distances of 1 and 2 equal N/2, respectively.

REFERENCES:
patent: 3311878 (1967-03-01), Melas
patent: 3818442 (1974-06-01), Solomon
patent: 3831145 (1974-08-01), Meckenburg et al.
patent: 4101934 (1978-07-01), Fukuoka
patent: 4199809 (1980-04-01), Pasahow et al.
patent: 4211996 (1980-07-01), Nakamura
patent: 4276647 (1981-06-01), Thacker et al.
patent: 4335458 (1982-06-01), Krol

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