Wired communications systems with improved capacity and security

A cable communication system, comprising:

• a plurality of nodes each comprising a division-free duplexing (DFD) system configured such that each of the plurality of nodes is operable in a DFD mode;
• and
• a processor configured to control a mode of operation of each of the plurality of nodes.
• wherein the plurality of nodes each comprise instructions for:
• receiving a primary signal;
• receiving a reference signal from a transmitter;
• processing the reference signal with an adaptive filter, wherein the adaptive filter uses the reference signal and primary signal as inputs for determining filter tap weights of the adaptive filter to provide an output;
• and
• subtracting the output of the adaptive filter from the primary signal to generate a cancelled signal.

A division-free duplexing (DFD) system comprising:

• a receiver capable of receiving an analog primary signal from a coaxial cable in a cable network;
• a transmitter capable of transmitting an analog transmitted signal to the coaxial cable;
• a directional coupler capable of sampling a portion of the analog transmitted signal to provide an analog reference signal;
• a first analog to digital converter capable of converting the analog primary signal into a digital primary signal;
• a second analog to digital converter capable of converting the analog reference signal into a digital reference signal;
• and
• a processor comprising instructions for:
• processing the digital reference signal with an adaptive filter, wherein the adaptive filter uses the digital reference and primary signals as inputs for determining filter tap weights of the adaptive filter to provide an output;
• and
• subtracting the output of the adaptive filter from the digital primary signal to generate a digital cancelled signal.