Tunable medium linear coder

An antenna system, comprising:

• a plurality of near-end electromagnetic (EM) radiating elements;
• a tunable medium positioned relative to the plurality of near-end EM radiating elements and a plurality of far-end EM radiating elements to scatter EM radiation transmitted between the plurality of near-end EM radiating elements and the plurality of far-end EM radiating elements;
• and
• control circuitry comprising a controller operably coupled to the tunable medium and programmed to modify EM properties of the tunable medium to operate as a linear coder between the plurality of near-end EM radiating elements and the plurality of far-end EM radiating elements based on which of the plurality of near-end EM radiating elements and the plurality of far-end EM radiating elements is a source of the EM radiation transmitted between the plurality of near-end EM radiating elements and the plurality of far-end EM radiating elements to modify the EM radiation transmitted between the plurality of near-end EM radiating elements and the plurality of far-end EM radiating elements.