1300km HF radio link with a 30 kbits/s data transfer rate

This paper presents an operational system of digital transmission within the HF frequency range, aiming at a significant increase of the bit rate compared to the current standard. Therefore, an array processing method performs with a heterogeneous array antennas. In addition, a spatio-temporal equalization is performed resorting to a blind algorithm (C.M.A.). Experimental results are presented and the bit rate reaches 30 kbits/s within a 9 kHz bandwidth.