A way to increase the bit ratein ionospheric radio links

C. Perrine, Y. M. Erhel, D. Lemur, L. Bertel, A. Bourdillon


The aim of this paper is to present a high data rate transmission system through the ionospheric channel in the HF-band (3-30 MHz). The applications expected in this study are image transmitting and real-time videoconferencing. Very high rates are required compared to the standard modems.
Therefore, an array processing is performed with a set of antennas whose spatial response differs from one another arranged in a circular array or in a collocated sensor. Synchronization (Zero Crossing
Detector) and source separation (LMS algorithm) resort to classical well-tested techniques involving training sequences. Experimental results are presented for both antenna configurations. These techniques improve data rate, reaching 20 kbits/s within the 6 kHz bandwidth (QAM 64) without
coding or interleaving.

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DOI: https://doi.org/10.4401/ag-3291
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X