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    Wyświetlanie 1-4 z 4
    Tytuł:
    Influence of Drift on Efficiency of Optimal Analog Adaptive Communication Systems with Feedback and Its Compensation
    Autorzy:
    Jędrzejewski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/227312.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    communication systems
    feedback
    drift compensation
    optimal adaptive estimation
    Opis:
    Results of analysis of drift influence on operation and efficiency of optimal analog adaptive communication systems with feedback and a new approach to drift compensation in these systems are presented in the paper. The proposed approach is based on application of the extended multidimensional adaptive algorithm that estimates simultaneously the value of a transmitted sample and the value of an unknown drift rate. The knowledge of the drift rate enables drift compensation and improves transmission efficiency of systems suffering problems related to drifts.
    Źródło:
    International Journal of Electronics and Telecommunications; 2013, 59, 1; 51-58
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    GOP Structure Adaptable to the Location of Shot Cuts
    Autorzy:
    Krulikovská, L.
    Polec, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/227351.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    shot cut detection
    Pearson correlation coefficient
    motion estimation
    adaptive threshold
    video encoding
    adaptive GOP structure
    Opis:
    In this paper we present a novel two stage algorithm for improving video coding efficiency. The proposed method combines video cut detection and adaptive GOP structure. At first, we have proposed a new technique of frames' comparison for the shot cut detection. The majority of existing methods compare pairs of successive frames. We compare actual frame with its motion estimated prediction. We also present adaptive threshold. The efficiency of novel technique for video cut detection was confirmed through experiment and compared to the commonly used ones in the terms of recall and precision. The next step is to situate I frames to the positions of detected cuts during the process of video encoding. Finally the proposed method is verified by simulations and the obtained results are compared with fixed GOP structures of sizes 4, 8, 12, 16, 32, 64, 128 and GOP structure with length of entire video. Proposed method achieved the gain in bit rate from 15,33% to 50,59%, while not degrading PSNR in comparison to simulated fixed GOP structures.
    Źródło:
    International Journal of Electronics and Telecommunications; 2012, 58, 2; 129-134
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    RADAR Signal Parameters Estimation in the MTD Tasks
    Autorzy:
    Prokopenko, I. G.
    Omelchuk, I. P.
    Chyrka, Y. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/227274.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    radar
    detection
    moving targets
    frequency estimation
    adaptive algorithms
    Bayesian empirical approach
    Opis:
    The MTD method adaptive to current target speed, in which suboptimal iterative algorithms for the reflected signal parameters estimation are synthesized, is suggested. This method allows to detect a slowly moving targets with radial speed 3-4 times less, than for pulse-pair subtraction (PPS).
    Źródło:
    International Journal of Electronics and Telecommunications; 2012, 58, 2; 159-164
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PCA Assisted DTCWT Denoising for Improved DOA Estimation of Closely Spaced and Coherent Signals
    Autorzy:
    Ganage, Dharmendra
    Ravinder, Yerram
    Powiązania:
    https://bibliotekanauki.pl/articles/226634.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DOA estimation
    signal denoising
    closely spaced
    coherent signal
    adaptive antenna array
    antenna elements
    Opis:
    Performance of standard Direction of Arrival (DOA) estimation techniques degraded under real-time signal conditions. The classical algorithms are Multiple Signal Classification (MUSIC), and Estimation of Signal Parameters via Rotational Invariance Technique (ESPRIT). There are many signal conditions hamper on its performance, such as closely spaced and coherent signals caused due to the multipath propagations of signals results in a decrease of the signal to noise ratio (SNR) of the received signal. In this paper, a novel DOA estimation technique named CW-PCA MUSIC is proposed using Principal Component Analysis (PCA) to threshold the nearby correlated wavelet coefficients of Dual-Tree Complex Wavelet transform (DTCWT) for denoising the signals before applying to MUSIC algorithm. The proposed technique improves the detection performance under closely spaced, and coherent signals with relatively low SNR conditions. Also, this method requires fewer snapshots, and less antenna array elements compared with standard MUSIC and wavelet-based DOA estimation algorithms.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 1; 111-117
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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