Title :
A SIMO System of Digital Transmission Through the Ionospheric Channel
Author :
Erhel, Y. ; Perrine, C. ; Lemur, D. ; Bourdillon, A.
Author_Institution :
Centre de Recherches des Ecoles de Coetquidan, Guer
Abstract :
This paper presents a SIMO system of trans horizon transmission through the ionospheric channel in the HF band (3- 30 MHz). The technical challenge is to increase significantly the data transfer rate if compared with standard modems (typically 4.8 kbits/s in a 3 kHz bandwidth). A multi channel receiving system is connected to an original array of collocated antennas : this device appears as polarization sensitive and, consequently, makes the separation of the incident multi paths efficient though there is no spatial diversity. A blind spatio temporal equalization, based on the Constant Modulus Algorithm (CMA), balances the distortions of the spectrum in an extended bandwidth of 9 kHz. An experimental radio link has been tested with a range of 1300 km. The corresponding results underline the improvement of the bit transfer rate which attains 30 kbits/s in a 9 kHz bandwidth resorting to a 16 QAM waveform.
Keywords :
HF antennas; HF radio propagation; direction-of-arrival estimation; radio networks; SIMO system; blind spatio temporal equalization; constant modulus algorithm; digital transmission; frequency 3 MHz to 30 MHz; ionospheric channel; multi channel receiving system; trans horizon transmission; Antenna arrays; Bandwidth; Blind equalizers; Hafnium; Modems; Polarization; Quadrature amplitude modulation; Radio link; Receiving antennas; Testing;
Conference_Titel :
Vehicular Technology Conference, 2006. VTC-2006 Fall. 2006 IEEE 64th
Conference_Location :
Montreal, Que.
Print_ISBN :
1-4244-0062-7
Electronic_ISBN :
1-4244-0063-5
DOI :
10.1109/VTCF.2006.83
