Comunicacions d'espectre eixamplat 1 Direct-Sequence Spread Spectrum (DSSS) 1 High Frequency (HF) 1 Hostile Channel 1 Ionosfera 1 Ionospheric Communications 1 Orthogonal Frequency Division Multiplexing (OFDM) 1 Radiofreqüència 1 Single Carrier Frequency Division Multiplexing Access (SC-FDMA) 1 Single Carrier Frequency Domain Equalization (SC-FDE) 1 Sounding 1 Tesis 1