MIMO Telecommunications with Near Ultrasounds
Résumé
Ultrasound telecommunications are a relevant alternative when radio frequencies are not allowed or appropriate. Performance of a near-ultrasound (15 - 20 kHz) telecommunication system with linear-frequency-modulated symbols (LFM), or chirps, is studied:
Ø formal study of BER (Bit Error Rate) with varying chirp-symbol time and chirpoverlap ratio;
Ø comparison with numerical simulations.
We designed an 8-element linear network to achieve MIMO telecommunications, using Beam Forming (BF) and Time Reversal (TR) for focalization:
Ø assessment of the propagation channel (impulse response (IR) of the environment);
Ø comparison of BF and TR, at a constant emission power, in several LOS (Line Of Sight) and NLOS (Non Line Of Sight) configurations.
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