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Author: search.filters.author.Punchalard, R.Subject: search.filters.subject.adaptive signal processing

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    An Application of an Adaptive Signal Processing Scheme for a QPSK Signal Demodulation
    (2022-01-01)
    Inban, P.
    ;
    Punchalard, R.
    ;
    Loedwassana, W.
    ;
    Benjangkaprasert, C.
    An adaptive digital signal processing scheme applied for a digital communication has been presented in the press. The model of an ANC is utilized to demodulate in a coherent detection scheme for a received QPSK signal. The coefficients of the system will be updated by the least mean square (LMS) algorithm that is controlled in the adaptation sequence according to the symbol duration of the received signal. Since such a manner is performed, the system is similar to integrate and dump (I&D) correlator in behavior. The analysis and simulation results have implied that the desired information signal can be recovered from the received signal by the proposed scheme with the same performance as the conventional optimum demodulation.
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    An Improved RLS-based Interference Cancellation
    (2022-01-01)
    Inban, P.
    ;
    Punchalard, R.
    ;
    Benjangkaprasert, C.
    An improved algorithm for mitigating the effect of power line interference in electrocardiogram (ECG) recording systems is presented. The proposed algorithm includes an interference detector (ID), an interference fundamental frequency estimator (IFFE), and an interference estimator (IE). The ID is used to evaluate the existence of the interference before recording. If it is present, the IFFE and IE are employed in the next steps. In the absence of interference, the observed signal is directly sent to the recorder and monitor. The presence of the ID can improve the performance of the system in terms of computational efficiency and system speed. The IFFE can track the variation of the interference frequency. Extensive computer simulations were run to demonstrate the performance of the proposed system.