Spread spectrum high performance techniques for a long haul high frequency link

• DOI: 10.1049/iet-com.2014.0807
• Publication Date: 2015-04-16T18:06:26Z
• Authors: Rosa Maria Alsina...; Martí Salvador; Marcos Hervás; Pau Bergadà; Joan Lluís Pijoan; David Badia
• Keywords: Link (geometry)

Skywave ionospheric communication systems offer a good choice to satellite communications when transmitting from the poles. For last 10 years authors have been sounding and testing modulations through 12 700 km high frequency link Spanish Antarctic Station Spain. Previous tests comparing direct sequence spread spectrum (DS‐SS) orthogonal division multiplexing (OFDM) showed that bit rate error (BER) results outperformed OFDM at expense of lower rates. In this study present three techniques for long haul increase spectral efficiency while keeping BER performance obtained. Tests performed with several symbol periods as well different bandwidth each technique, hence can conclude which combination best suits channel.