System for embedding message waveforms within conventionally modulated signals

A communication device, comprising:

• a radio frequency (RF) module;
• and
• a computing component communicatively coupled to the RF module, the computing component defining a software defined radio, wherein the computing component comprises at least one processor;
• an input buffer configured to store digital input data;
• and
• memory storing instructions which, when executed by the at least one processor, implement a time domain modulator configured to generate auxiliary waveform data based upon the input digital data wherein phase shifts in an auxiliary waveform represented by the auxiliary waveform data relative to a carrier signal encode the input digital data within the auxiliary waveform;
• a mixer configured to mix the auxiliary waveform data and modulation data representing a modulated signal and thereby produce a multi-component signal;
• one or more digital-to-analog converters for generating an encoded analog waveform from a representation of the multi-component signal, the encoded analog waveform being provided to the RF module.

An apparatus, comprising:

• one or more processors;
• a memory storing instructions which, when executed by the one or more processors, cause the one or more processors to:
• receive input digital data;
• store first digital data representing a first auxiliary waveform period wherein a phase of the first auxiliary waveform period is shifted in a positive direction relative to a phase of a carrier signal;
• store second digital data representing a second auxiliary waveform period wherein a phase of the second auxiliary waveform period is shifted in a negative direction relative to the phase of the carrier signal;
• generate, in response to the input digital data and using the first digital data and the second digital data, auxiliary waveform data corresponding to the auxiliary waveform wherein the first digital data represents occurrences of a first binary value within the input digital data and the second digital data represents occurrences of a second binary value within the input digital data;
• mix the auxiliary waveform data and modulation data representing a modulated signal so as to produce a multi-component signal.

A receiver apparatus, comprising:

• one or more processors;
• a memory storing instructions which, when executed by the one or more processors, cause the one or more processors to:
• receive a multi-component analog signal generated from a modulated signal and a auxiliary waveform encoding input digital data, the auxiliary waveform having an amplitude corresponding to a summation of one or more layering signals and a carrier signal;
• generate digital samples of the multi-component analog signal;
• mix the digital samples of the multi-component analog signal with digital samples of a carrier associated with the modulated signal to create a downconverted signal;
• and
• decode the downconverted signal to obtain estimates of the input digital data.