ANLAEG TIL MULTINIVEAU-DATATRANSMISSION VED HJAELP AF EN VINKELMODULERET BAEREBOELGE MED KONSTANT AMPLITUDE
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 amplitude enables amplification in non-linear transmitter output stages. Associated with the n-levels are k(k>n) phase variations in accordance wi...
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Zusammenfassung: | 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 amplitude enables amplification in non-linear transmitter output stages. Associated with the n-levels are k(k>n) phase variations in accordance with such a rule, depending 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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