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Authors: Perrine, C.* 
Erhel, Y. M.* 
Lemur, D.* 
Bertel, L.* 
Bourdillon, A.* 
Title: A way to increase the bit ratein ionospheric radio links
Issue Date: 2004
Series/Report no.: 2-3 supl/47 (2004)
Subject Classification01. Atmosphere::01.02. Ionosphere::01.02.06. Instruments and techniques 
Abstract: 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.
Appears in Collections:Annals of Geophysics

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