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    Wyświetlanie 1-8 z 8
    Tytuł:
    CDMA wireless system with blind multiuser detector
    Autorzy:
    Leong, W. Y.
    Homer, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/309140.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    code division multiple access
    independent component analysis
    blind source separation
    Opis:
    In this paper we present an approach capable of countering the presence of multiple access interference (MAI) in code division multiple access (CDMA) channels. We develop and implement a blind multiuser detector, based on an independent component analysis (ICA) to mitigate both MAI and noise. This algorithm has been utilized in blind source separation (BSS) of unknown sources from their linear mixtures. It can also be used for estimation of the basis vectors of BSS. The aim is to include an ICA algorithm within a wireless receiver in order to reduce the level of interference in CDMA systems. This blind multiuser detector requires less precise knowledge of the channel than does the conventional single-user receiver. The proposed blind multiuser detector is made robust with respect to imprecise knowledge of the received signature waveforms of the user of interest. Several experiments are performed in order to verify the validity of the proposed learning algorithm.
    Źródło:
    Journal of Telecommunications and Information Technology; 2006, 1; 69-75
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Improved Method of Permutation Correction in Convolutive Blind Source Separation
    Autorzy:
    Wang, L.
    Ding, H.
    Yin, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/177954.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    blind source separation
    cocktail party
    convolutive mixing
    frequency domain
    permutation problem
    Opis:
    This paper proposes an improved method of solving the permutation problem inherent in frequency-domain of convolutive blind source separation (BSS). It combines a novel inter-frequency dependence measure: the power ratio of separated signals, and a simple but effective bin-wise permutation alignment scheme. The proposed method is easy to implement and surpasses the conventional ones. Simulations have shown that it can provide an almost ideal solution of the permutation problem for a case where two or three sources were mixed in a room with a reverberation time of 130 ms.
    Źródło:
    Archives of Acoustics; 2010, 35, 4; 493-504
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Amended Adaptive Algorithm for Corpus Based Improved Speech Enhancement
    Autorzy:
    Priya, P. Shanmuga
    Nidhyananthan, S. Selva
    Kumari, R. Shantha Selva
    Powiązania:
    https://bibliotekanauki.pl/articles/226976.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    least mean square
    normalised least mean square
    amended normalised least mean square
    blind source separation
    Opis:
    Speech enhancement objective is to improve the noisy speech signals for human perception. The intention of speech enhancement algorithm is to improve the performance of the communication, when the signal is occluded by noise. The quality and intelligibility of speech is reduced because of the presence of background noise. There are various adaptive filtering algorithms for speech enhancement. The existing least mean square and normalised least mean square algorithms have the problem of choosing the step size that guarantees the stability of the algorithm. To overcome this problem, we focus on speech enhancement by amended adaptive filtering. The proposed algorithm follows blind source separation strategy using adaptive filtering. Comparison of existing adaptive filtering algorithms with proposed algorithm justifies the amendment incorporated in this paper. Taking the objective criteria into account the algorithms has been tested for segmental signal to noise ratio (SegSNR), segmental mean square error (SegMSE), signal to noise ratio and mean square error. The proposed algorithm can be used for hand-free cell phone, hearing aids and teleconferencing systems.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 3; 513-517
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ensemble neural network approach for accurate load forecasting in a power system
    Autorzy:
    Siwek, K.
    Osowski, S.
    Szupiluk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/907659.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    sieć neuronowa
    ślepa separacja sygnałów
    prognozowanie obciążenia
    neural network
    blind source separation
    ensemble of predictors
    load forecasting
    Opis:
    The paper presents an improved method for 1-24 hours load forecasting in the power system, integrating and combining different neural forecasting results by an ensemble system. We will integrate the results of partial predictions made by three solutions, out of which one relies on a multilayer perceptron and two others on self-organizing networks of the competitive type. As the expert system we will apply different integration methods: simple averaging, SVD based weighted averaging, principal component analysis and blind source separation. The results of numerical experiments, concerning forecasting the hourly load for the next 24 hours of the Polish power system, will be presented and discussed. We will compare the performance of different ensemble methods on the basis of the mean absolute percentage error, mean squared error and maximum percentage error. They show a significant improvement of the proposed ensemble method in comparison to the individual results of prediction. The comparison of our work with the results of other papers for the same data proves the superiority of our approach.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2009, 19, 2; 303-315
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    O metodach ślepego przetwarzania sygnałów diagnostycznych
    About methods the blind processing of diagnostic signals
    Autorzy:
    Dybała, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/327948.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    ślepe przetwarzanie sygnałów
    ślepa separacja sygnałów
    analiza składników niezależnych
    sieci neuronowe
    blind signal processing
    blind source separation
    independent component analysis
    neural networks
    Opis:
    W artykule przedstawiono metody ślepego przetwarzania sygnałów traktując je jako interesujące sposoby wyodrębniania sygnałów informacyjnych i eliminacji zakłóceń. Zaprezentowano różne modele propagacji i mieszania sygnałów oraz różne metody rekonstrukcji tych sygnałów przy pomocy odpowiednich sieci neuronowych. W końcowej części artykułu omówiono problemy związane z zastosowaniem tych metod w diagnostyce technicznej i przedstawiono pewne modyfikacje i rozszerzenia klasycznego ślepego przetwarzania sygnałów dostosowujące przedstawione podejście do specyfiki diagnozowania obiektów technicznych.
    The article presents methods of blind signal processing, which make possible the separation the informative signals and the elimination of disturbances. Different models of propagation and mixing of signals are presented and different methods of reconstruction of source signals with use of neural networks are showed. In last section of article, problems related with application of mentioned methods in technical diagnostics are discussed. Also some modifications and extensions of classical blind signal processing are showed, adapting presented approach to peculiarity of diagnosing of technical objects.
    Źródło:
    Diagnostyka; 2005, 36; 53-60
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fast and unique Tucker decompositions via multiway blind source separation
    Autorzy:
    Zhou, G.
    Cichocki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/201572.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Multiway Blind Source Separation (MBSS)
    Multilinear Independent Component Analysis (MICA)
    Constrained tensor decompositions
    Tucker models
    Nonnegative Tucker Decomposition (NTD)
    Opis:
    A multiway blind source separation (MBSS) method is developed to decompose large-scale tensor (multiway array) data. Benefitting from all kinds of well-established constrained low-rank matrix factorization methods, MBSS is quite flexible and able to extract unique and interpretable components with physical meaning. The multilinear structure of Tucker and the essential uniqueness of BSS methods allow MBSS to estimate each component matrix separately from an unfolding matrix in each mode. Consequently, alternating least squares (ALS) iterations, which are considered as the workhorse for tensor decompositions, can be avoided and various robust and efficient dimensionality reduction methods can be easily incorporated to pre-process the data, which makes MBSS extremely fast, especially for large-scale problems. Identification and uniqueness conditions are also discussed. Two practical issues dimensionality reduction and estimation of number of components are also addressed based on sparse and random fibers sampling. Extensive simulations confirmed the validity, flexibility, and high efficiency of the proposed method. We also demonstrated by simulations that the MBSS approach can successfully extract desired components while most existing algorithms may fail for ill-conditioned and large-scale problems.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 389-405
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Regularized nonnegative matrix factorization: Geometrical interpretation and application to spectral unmixing
    Autorzy:
    Zdunek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/329732.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    blind source separation
    nonnegative matrix factorization
    active set algorithm
    regularized NMF
    polytope approximation
    ślepa separacja sygnału
    nieujemna faktoryzacja macierzy
    Opis:
    Nonnegative Matrix Factorization (NMF) is an important tool in data spectral analysis. However, when a mixing matrix or sources are not sufficiently sparse, NMF of an observation matrix is not unique. Many numerical optimization algorithms, which assure fast convergence for specific problems, may easily get stuck into unfavorable local minima of an objective function, resulting in very low performance. In this paper, we discuss the Tikhonov regularized version of the Fast Combinatorial NonNegative Least Squares (FC-NNLS) algorithm (proposed by Benthem and Keenan in 2004), where the regularization parameter starts from a large value and decreases gradually with iterations. A geometrical analysis and justification of this approach are presented. The numerical experiments, carried out for various benchmarks of spectral signals, demonstrate that this kind of regularization, when applied to the FC-NNLS algorithm, is essential to obtain good performance.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2014, 24, 2; 233-247
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sequential separation of twin pregnancy electrocardiograms
    Autorzy:
    Kotas, M.
    Leski, J. M.
    Wrobel, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/202099.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fetal ECG
    twin pregnancy
    ECG signals decomposition
    blind source separation
    independent component analysis
    source subspaces
    projective filtering
    adaptive filtering
    EKG płodu
    ciąża bliźniacza
    EKG
    separacja sygnałów niewidomych
    niezależna analiza składowych
    podprzestrzenie źródła
    filtracja adaptacyjna
    Opis:
    We propose to tackle the problem of maternal abdominal electric signals decomposition with a combined application of independent component analysis and projective or adaptive filtering. The developed method is employed to process the four-channel abdominal signals recorded during twin pregnancy. These signals are complicated mixtures of the maternal ECG, the ECGs of the fetal twins and noise of various origin. Although the independent component analysis cannot separate the respective signals, the proposed combination of the methods deals with this task successfully. A simulation experiment confirms high efficiency of this approach.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 91-101
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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