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Access type: UnknownSubject: search.filters.subject.adaptive algorithm

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    Performance analysis of cascade spline adaptive filtering based on normalized orthogonal gradient adaptive algorithm
    (2024-12-01)
    Wiangtong, Theerayod
    ;
    Sitjongsataporn, Suchada
    In this paper, the cascade architecture of spline adaptive filtering (CSAF) for nonlinear systems is presented with the normalized version of orthogonal gradient adaptive (NOGA) algorithm. Spline adaptive filtering comprises a sandwich of the first linear adaptive filtering (LAF) and nonlinear adaptive look-up table. In this cascading architecture, SAF is connected to the second LAF. NOGA is considered as the fast convergence applied by stochastic gradient-based approach. Convergence properties of the proposed NOGA-CSAF algorithm in terms of instantaneous errors can be derived by using Taylor series expansion. Experimental results demonstrate the effectiveness of proposed NOGA-CSAF algorithm using the mean square error scheme. It clearly outperforms the traditional least mean square algorithm on CSAF model in the nonlinear identification system.
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    Adaptive Orthogonal Gradient Algorithm Based on Fair Cost Function
    (2024-01-01)
    Sitjongsataporn, Suchada
    ;
    Wiangtong, Theerayod
    This paper presents an adaptive orthogonal gradient algorithm with the unconstrained Fair cost function. An adaptive orthogonal gradient-based algorithm is investigated with the help of orthogonal projection mechanism to update the approximate tap-weight vector for the convergence enhancement. Fair cost function is preferable with a smooth points that is able to detect the statistical characteristics of error. Objective of this work is to present an adaptive orthogonal gradient algorithm using Fair cost function (OGA-Fair) to enhance the performance. Simulation results show that proposed adaptive OGA-Fair algorithm can perform with the fast convergence rate and robustness better than the existing method.
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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.