System for data communications between modems has a transmission channel to transmit frequency multiplex transmission signals each with one of several predefined frequencies and data bits allocated to each signal range.

摘要

A transmitter uses a transmission channel to transmit to a receiver multiple frequency multiplex transmission signals each with one of several predefined frequencies. One or more data bits are each allocated to each signal range allocated to transmission signals with a defined frequency. The transmitter can transmit the data bits to the receiver through an appropriate selection of an amplitude and phase for each transmission signal. An Independent claim is also included for a method for allocating data bits to multiple signal ranges each allocated to frequency multiplex transmission signals with a specific frequency.