A DS-SS signaling based system proposal for low SNR HF digital communications
Marc Deumal, Carles Vilella, Joan Claudi Socoró, Rosa Ma Alsina‐Pagès, Joan L. Pijoan · 2006
In this paper a DS-SS signaling based physical layer for low SNR links is presented. This technique is able to increase the spectral efficiency by scarcely decreasing the BER performance at the expense of an increased receiver complexity. Moreover, accurate channel estimation is not required. Preliminary transmissions were done in a HF link between the Antarctica and Spain. Four setups with different transmission bandwidths and data rates have been evaluated. Up to 55.7% error free transmissions were achieved by using a transmission bandwidth of 5156 Hz, a coded bit rate of 57 bps and a transmission power of 200 W in a 12700 Km ionospheric link.