Multilevel modulator capable of producing a multilevel...

Details Multilevel modulator capable of producing a multilevel... Multilevel modulator capable of producing a multilevel...

H - Electricity

04

L

354/106, 329/21,

H04L 27/06 (2006.01) B60N 2/02 (2006.01) H04L 27/34 (2006.01)

Patent

CA 1257664

Abstract of the Disclosure: In a multilevel modulator for use in modulating a main data signal of n bits and a subdata signal of a single bit into a multilevel quadrature amplitude modulated signal, the main data and the subdata signals have a first bit rate f1 and a second bit rate f1/m, respectively, where m is a positive integer which is not less than two. A converting circuit converts the main data signal according to the subdata signal into a binary intermediate signal. The binary intermediate signal is processed by a digital-to-analog converter and a modulator into the multilevel quadrature amplitude modulated signal having output signal points of (2n + .alpha.) where .alpha. represents an integer which is not less than zero and is not greater than 2n/m. A multilevel demodulator carries out an inverse operation to reproduce the modulated signal into the main data signal and the subdata signal.

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