System for multi-level data transmission by means of an...

Details System for multi-level data transmission by means of an... System for multi-level data transmission by means of an...

H - Electricity

04

L

325/38

H04L 27/18 (2006.01) H04L 27/20 (2006.01) H04L 27/227 (2006.01)

Patent

CA 1159112

1 PHN. 9370. ABSTRACT: A system for transmitting n-level data signals by means of an angle-modulated carrier having a constant amplitude and a continuous phase. The constant ampli- tude enables amplification in non-linear transmitter out- put stages. Associated with the n-levels are k(k > n) phase variations in accordance with such a rule, depend- ing on preceding phase variations, that the spectrum of the angle-modulated signal becomes narrower. In a symbol interval the phase of the carrier changes by an amount from the sequence extending from -(k-1) .pi./n to (k+1) .pi./n in increments of 2 .pi./n. The receiver is formed by a differential n-phase receiver. The system is used inter alia for radio transmission of digital information.

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