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  • 8 PSK modulation for high data rate transmission

    Paper ID



    • A. Ribes
    • G. Lesthievent
    • P. Therby
    • J. Oster
    • N. Carier


    Centre National d'Etudes Spatiales (CNES)






    The needs of new Earth observation and Telecommunication missions lead to higher and higher rate for data transmission. In Earth Observation, X-Band QPSK modulations which are widely used today cannot meet this new requirement because of the limitation of allocated frequency bandwidths. The use of transmission in Ka-Band solves the high data rate issue but is penalized by the need of a higher EIRP due to atmospheric and rain attenuations. An original solution to satisfy those new transmission needs is 8PSK modulation, whose spectral efficinecy is the main advantage over classical QPSK modulation. 8PSK modulation associated with a trellis coding concatenated with Reed Solomon coding allows link budget gain of several dB versus QPSK modulation, at identical spectral occupation, or a better spectral efficiency with a smaller improvement of link budget, depending on the chosen trellis coding rate. Such a scheme is actually introduced in CCSDS standard for near earth high data rate links. A X-Band 8PSK transmitter for space use, including channel coding functions, carrier generation, 8PDK modulation and high power amplification has been developed with its associated ground demodulator. The purpose of the paper is to present the concept and advantage of trellis coded 8PSK modulation along with on-going developments and their planned applications for satellites programs.