Electromagnetic waves Bit error rate 1 Bit-error rate 1 Carrier frequency 1 Communication blackouts 1 Demodulation 1 Dispersion relations 1 Drift velocities 1 Electric fields 1 Electric space charge 1 Electron sheets 1 Electrons 1 Extremely high frequencies 1 Field theory 1 Free electron 1 Geometrical optics 1 High frequency communication 1 High frequency signal propagation 1 High-frequency communication systems 1 Hypersonic plasma 1 Hypersonic vehicles 1 Optical variables measurement 1 Plasma diagnostics 1 Plasma sheaths 1 Polarizabilities 1 Quantum theory 1 Signal attenuation 1 Space-charge wave 1 Time varying 1 Two-dimensional electron gas 1