A way to increase the bit ratein ionospheric radio links
Main Article Content
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.
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.
Article Details
How to Cite
Perrine, C., Erhel, Y. M., Lemur, D., Bertel, L. and Bourdillon, A. (2004) “A way to increase the bit ratein ionospheric radio links”, Annals of Geophysics, 47(2-3 Sup.). doi: 10.4401/ag-3291.
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OLD
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