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In this paper, we propose a new method to compensate Doppler frequency shift for OFDM-based underwater acoustic communication systems. In order to save bandwidth, we do not use additional signal header (preamble) in each OFDM frame as proposed in many conventional approaches. Instead, the central sub-carrier is reserved for pilot transmission. This subcarrier is so-called as the carrier frequency...
We propose receiver architecture for FTN signaling transmission in the DVB-S2 standard. Typically, ISI- free condition has been assumed for DVB-S2 receiver design when satellite transponder model is absent. However, it's necessary to modify the receiver for FTN signaling since ISI becomes major issue. In this work, we take into account an example model as complete receiver for FTN signaling in DVB-S2...
For three-phase three-wire grid, a method to synchronize the converter to the grid voltage, which was distorted by low-order harmonics and unbalances, has been widely described. In addition to filtering them, the DC rejection can be achieved together with a frequency adaptive observer in order to eliminate DC bias in the voltage. The state equation for the observer is newly established, and the observer...
The three-phase PWM delta-switch rectifier is an unidirectional topology that presents interesting features, such robustness and high efficiency. Most of the delta-switch rectifier modulation strategies require current sector identification in order to properly apply the according voltage vectors. This is typically neglected in power factor correction applications due to the low displacement angle...
We compute the training sequences that minimize the Cramer-Rao Bound (CRB) corresponding to the joint estimator for carrier phase, carrier frequency, and symbol timing offset. It is shown that if the symbols in a training sequence are drawn from the set of complex numbers, the resulting CRB is lower than if the symbols are drawn from a discrete set of constellation points.
This paper briefly reviews the adaptive notch filter (ANF) based synchronization techniques for single and three-phase converter-interfaced distributed generation (DG) systems. These techniques are compared in terms of their capability in tracking the grid frequency variations in the presence of low order harmonics and unbalance conditions. The techniques introduced in this paper are applicable for...
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