Digital signal communication system

Details Digital signal communication system Digital signal communication system

H - Electricity

04

L

340/74

H04L 1/00 (2006.01) H04L 27/18 (2006.01)

Patent

CA 1194955

ABSTRACT A digital communication system in which parity checking of all the bits can be effected, even if differential logic is used is described. In the trans- mitter section first digital signals of n trains, where n is a whole number equal to 3 or larger, are differentially converted to provide second digital signals which are used to provide a modulated signal with 2n (=N) modulation levels. This modulated signal is transmitted and received in the receiving section and there it is demodulated to provide third digital signals of n trains corresponding to the second digital signals. The third signals are dif- ferentially converted to provide fourth digital signals of n trains corres- ponding to the first digital signals. One novel aspect of the system is that the Hamming distance between two words of the second digital signals corres- ponding to the adjacent two modulation levels is either 1 or 2 and there are N/2 Hamming distances equal to 1 and N/2 Hamming distances equal to 2.

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