In this paper, we propose a dominant Doppler compensation technique for single carrier single input multiple output (SIMO) underwater acoustic communication. An initial pre-processing of the dominant Doppler is used to speed up the convergence rate of the adaptive receiver at the beginning of the transmission. Then, a tracking scheme is proposed to compensate for the residual dominant Doppler. The receiver scheme is tested in an experimental context. Successful communication is demonstrated at up to 4.926 kSymb/s with a transmitting platform moving up to 1.8 m/s. The system exhibits enhanced robustness for continuous-time communication with large Doppler shifts values and time-varying multipath channels.
International audiencehis paper proposes a computationaly-efficient procedure dedicated to time-domain phase noise (PN) modeling of a phase-locked loop (PLL)-based frequency synthesizer in a radio-frequency (RF) context. The structure proposed is able to describe any kind of PN including thermal and flicker noise regions using time-domain equations. The design process of the phase noise modeling process is detailed. An expression of the estimated mean square error (MSE) of the frequency response of the PN generating system is proposed and compared to a previously proposed PN generating system. The spectral behaviour of the simulated frequency synthesizer is compared to practical PN measurements obtained with a spectral analyzer
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