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http://hdl.handle.net/2122/819
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) | URI: | http://hdl.handle.net/2122/819 | Subject Classification: | 01. 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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