Patent ID: 6269105
Filing Date: 2001-07-31
Classification: H04L

Abstract:
A data communication system for simultaneously communicating independent first and other data streams, comprising:a modulator for modulating a first carrier with a first data stream to provide a modulated first carrier;an auxiliary sinusoidal source for imposing distinguishable values of a feature on the modulated first carrier to represent at least one other data stream;wherein the feature of the modulated first carrier that is used to represent at least one other data stream includes an amplitude of the modulated first carrier with the features;a transmitter for transmitting the modulated first carrier with the distinguishable values of the feature imposed thereon through a transmission medium;a receiver for receiving the transmitted modulated first carrier with the distinguishable values of the feature to provide a received modulated first carrier with the feature;a demodulator for demodulating the received modulated first carrier with feature to provide a first output signal representing the first data stream; anda detector for detecting the distinguishable values of the feature of the received modulated first carrier with the feature to provide at least one other data stream.