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    Wyświetlanie 1-9 z 9
    Tytuł:
    Singular Vectors in Acoustic Simulation Tests of St. Paul the Apostle Church in Bochnia
    Autorzy:
    Kosała, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/177255.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic quality
    index method
    churches
    singular value decomposition (SVD)
    acoustics adaptation
    Opis:
    A new approach to acoustic quality assessment of churches during simulation tests is proposed in the article. The numerical global index, based on four partial indices: reverberation, speech intelligibility, music sound index and a proposed new one – sound strength index, assesses the acoustic parameters of the model of the tested church in a complex manner. The global single number index was obtained from 17 simulations of acoustic adaptation options of the investigated church’s interior. The equation of the approximate global index has been obtained by means of singular vectors, obtained from Singular Value Decomposition (SVD) of the Index Observation Matrix of Simulation Variants (IOMSV). The weights of four partial indices and a universal equation of the global index have been calculated using the SVD technique to solve the problem of correlated acoustical parameters. The global index may be a helpful tool during simulation tests of acoustic quality assessment of churches. The proposed final equation of the global index does not require knowledge of the SVD technique and the values of acoustic parameters preferred for churches. Therefore the methodology proposed is easily applicable.
    Źródło:
    Archives of Acoustics; 2012, 37, 1; 23-30
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of five SVD-based algorithms for calibration of spectrophotometric analyzers
    Autorzy:
    Wagner, J.
    Morawski, R. Z.
    Miękina, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/220564.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spectrophotometry
    chemometrics
    singular value decomposition
    regularisation
    food analysis
    edible oils analysis
    Opis:
    Spectrophotometry is an analytical technique of increasing importance for the food industry, applied i.a. in the quantitative assessment of the composition of mixtures. Since the absorbance data acquired by means of a spectrophotometer are highly correlated, the problem of calibration of a spectrophotometric analyzer is, as a rule, numerically ill-conditioned, and advanced data-processing methods must be frequently applied to attain an acceptable level of measurement uncertainty. This paper contains a description of four algorithms for calibration of spectrophotometric analyzers, based on the singular value decomposition (SVD) of matrices, as well as the results of their comparison - in terms of measurement uncertainty and computational complexity - with a reference algorithm based on the estimator of ordinary least squares. The comparison is carried out using an extensive collection of semi-synthetic data representative of trinary mixtures of edible oils. The results of that comparison show the superiority of an algorithm of calibration based on the truncated SVD combined with a signal-to-noise ratio used as a criterion for the selection of regularisation parameters - with respect to other SVD-based algorithms of calibration.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 2; 191-204
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Single Number Index to Assess Selected Acoustic Parameters in Churches with Redundant Information
    Autorzy:
    Kosała, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/177017.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic quality
    index method
    sacral objects
    singular value decomposition (SVD)
    redundant information
    Opis:
    The paper presents an innovative approach for the index assessment of the acous- tic properties of churches. A new formula for an approximate single number index to assess selected acoustic parameters of church interiors, such as reverberation time (RT), speech intelligibility index (RASTI) and music clarity index (C80), is presented in the paper. The formula is created by means of the Singular Value Decomposition (SVD) method. An innovative approach for calculating the weights of partial in- dices is shown by solving the problem of redundant information, i.e., the system of overdetermined linear equations, using a computed pseudoinverse matrix. The new procedures for calculating the values of three partial indices and the single number index to assess selected acoustic parameters are presented. The proposed method was verified by measurements in several selected churches.
    Źródło:
    Archives of Acoustics; 2011, 36, 3; 545-560
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhance the Capacity of MIMO Wireless Communication Channel using SVD and Optimal Power Allocation Algorithm
    Autorzy:
    Kumar, Neeraj
    Kaur, Dalveer
    Powiązania:
    https://bibliotekanauki.pl/articles/226875.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MIMO
    water filling algorithm
    singular value decomposition
    channel state information
    channel capacity
    Opis:
    Multiple input multiple output (MIMO) is a multiple antenna technology used extensively in wireless communication systems. With the ever increasing demand in high data rates, MIMO system is the necessity of wireless communication. In MIMO wireless communication system, where the multiple antennas are placed on base station and mobile station, the major problem is the constant power of base station, which has to be allocated to data streams optimally. This problem is referred as a power allocation problem. In this research, singular value decomposition (SVD) is used to decouple the MIMO system in the presence of channel state information (CSI) at the base station and forms parallel channels between base station and mobile station. This practice parallel channel ensures the simultaneous transmission of parallel data streams between base station and mobile station. Along with this, water filling algorithm is used in this research to allocate power to each data stream optimally. Further the relationship between the channel capacity of MIMO wireless system and the number of antennas at the base station and the mobile station is derived mathematically. The performance comparison of channel capacity for MIMO systems, both in the presence and absence of CSI is done. Finally, the effect of channel correlation because of antennas at the base stations and the mobile stations in the MIMO systems is also measured.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 1; 71-78
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Signal Subspace Speech Enhancement Approach Based on Joint Low-Rank and Sparse Matrix Decomposition
    Autorzy:
    Sun, C.
    Xie, J.
    Leng, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/177990.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    subspace speech enhancement
    singular value decomposition
    joint low-rank and sparse matrix decomposition
    Opis:
    Subspace-based methods have been effectively used to estimate enhanced speech from noisy speech samples. In the traditional subspace approaches, a critical step is splitting of two invariant subspaces associated with signal and noise via subspace decomposition, which is often performed by singular-value decomposition or eigenvalue decomposition. However, these decomposition algorithms are highly sensitive to the presence of large corruptions, resulting in a large amount of residual noise within enhanced speech in low signal-to-noise ratio (SNR) situations. In this paper, a joint low-rank and sparse matrix decomposition (JLSMD) based subspace method is proposed for speech enhancement. In the proposed method, we firstly structure the corrupted data as a Toeplitz matrix and estimate its effective rank value for the underlying clean speech matrix. Then the subspace decomposition is performed by means of JLSMD, where the decomposed low-rank part corresponds to enhanced speech and the sparse part corresponds to noise signal, respectively. An extensive set of experiments have been carried out for both of white Gaussian noise and real-world noise. Experimental results show that the proposed method performs better than conventional methods in many types of strong noise conditions, in terms of yielding less residual noise and lower speech distortion.
    Źródło:
    Archives of Acoustics; 2016, 41, 2; 245-254
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation Models for Acoustic Analysis of St. Elizabeth of Hungary Church in Jaworzno Szczakowa
    Autorzy:
    Kosała, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/177877.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic quality
    index method
    church acoustics
    Singular Value Decomposition
    SVD
    acoustic simulation tests
    Opis:
    In parallel with research conducted using conventional methods, a uniform index method for assessing the acoustic quality of Roman Catholic churches has been developed. The latest version of the index method has been created using the index observation matrix of 12 churches which have been rated by means of the single number global index. Assessments of the acoustic quality of any Roman Catholic church, using two calculation models: the Global Acoustic Properties Index (GAP) and the Global Index (GI), are shown in the article. The verification was performed on the example of one church, showing the way of calculating global indices to assess the acoustic quality of a new facility. The next stages in the development of the index method for assessing the acoustic quality of churches were taking into account the audience, using simulation tests and determining the spatial distribution of the single number GAP index in an examined church. An attempt to use the GAP and GI calculation models to assess the acoustic properties of some churches is also shown in the article.
    Źródło:
    Archives of Acoustics; 2016, 41, 3; 485-498
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modulation-Mode Assignment in SVD-Aided Downlink Multiuser MIMO-OFDM Systems
    Autorzy:
    Aust, S.
    Ahrens, A.
    Benavente-Peces, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/227057.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiple-input multiple-output system
    orthogonal frequency division multiplexing
    singular value decomposition
    bit allocation
    wireless transmission
    Opis:
    Multicarrier transmission such as OFDM (orthogonal frequency division multiplexing) is an established technique for radio transmission systems and it can be considered as a promising approach for next generation wireless systems. However, in order to comply with the demand on increasing available data rates in particular in wireless technologies, systems with multiple transmit and receive antennas, also called MIMO (multiple-input multiple-output) systems, have become indispensable for future generations of wireless systems. Due to the strongly increasing demand in high-data rate transmission systems, frequency non-selective MIMO links have reached a state of maturity and frequency selective MIMO links are in the focus of interest. In this field, the combination of MIMO transmission and OFDM can be considered as an essential part of fulfilling the requirements of future generations of wireless systems. However, single-user scenarios have reached a state of maturity. By contrast multiple users' scenarios require substantial further research, where in comparison to ZF (zero-forcing) multiuser transmission techniques, the individual user's channel characteristics are taken into consideration in this contribution. The performed joint optimization of the number of activated MIMO layers and the number of transmitted bits per subcarrier shows that not necessarily all user-specific MIMO layers per subcarrier have to be activated in order to minimize the overall BER under the constraint of a given fixed data throughput.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 4; 459-464
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modulation-Mode Assignment for SVD-assisted Downlink Multiuser MIMO Transmission Schemes with Iterative Detection
    Autorzy:
    Ahrens, A.
    Benavente-Peces, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/226541.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiple-input multiple-output system
    singular value decomposition
    bit allocation
    power allocation
    wireless transmission
    multiuser transmission
    Opis:
    Since the capacity of multiple-input multiple-output (MIMO) systems increases linearly with the minimum number of antennas at both, the transmitter as well as the receiver side, MIMO systems have attracted a lot of attention for both frequency and non-frequency selective channels and reached a state of maturity. By contrast, MIMO-aided multiple-user systems require substantial further research. In comparison to zero-forcing (ZF) multiuser transmission techniques, where all users are treated jointly, the investigated singular value decomposition (SVD) assisted DL multiuser MIMO solution takes the individual user's channel characteristics into account. In analogy to bit-interleaved coded irregular modulation, we introduce a MIMO-BICM scheme, where different user-specific signal constellations and mapping arrangement were used within a single codeword. Extrinsic information transfer (EXIT) charts are used for analyzing and optimizing the convergence behaviour of the iterative demapping and decoding. Our results show that in order to achieve the best bit-error rate, not necessarily all user-specific MIMO layers have to be activated.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 1; 127-134
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigating the links of internal and external reliability with the system conditionality in Gauss-Markov models with uncorrelated observations
    Badanie związków między niezawodnością wewnętrzną i zewnętrzną a uwarunkowaniem układu w modelach Gaussa-Markova z nieskorelowanymi obserwacjami
    Autorzy:
    Prószyński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/145593.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    niezawodność
    system warunkowości
    rozkład wartości pojedynczej
    internal reliability
    external reliability
    system conditionality
    singular value decomposition
    uncorrelated observations
    Opis:
    The relationship between internal response-based reliability and conditionality is investigated for Gauss-Markov (GM) models with uncorrelated observations. The models with design matrices of full rank and of incomplete rank are taken into consideration. The formulas based on the Singular Value Decomposition (SVD) of the design matrix are derived which clearly indicate that the investigated concepts are independent of each other. The methods are presented of constructing for a given design matrix the matrices equivalent with respect to internal response-based reliability as well as the matrices equivalent with respect to conditionality. To analyze conditionality of GM models, in general being inconsistent systems, a substitute for condition number commonly used in numerical linear algebra is developed, called a pseudo-condition^number. Also on the basis of the SVD a formula for external reliability is proposed, being the 2-norm of a vector of parameter distortions induced by minimal detectable error in a particular observation. For systems with equal nonzero singular values of the design matrix, the formula can be expressed in terms of the index of internal response-based reliability and the pseudo-condition^number. With these measures appearing in explicit form, the formula shows, although only for the above specific systems, the character of the impact of internal response-based reliability and conditionality of the model upon its external reliability. Proofs for complementary properties concerning the pseudo-condition^number and the 2-norm of parameter distortions in systems with minimal constraints are given in the Appendices. Numerical examples are provided to illustrate the theory.
    Badany jest związek między niezawodnością wewnętrzną bazującą na odpowiedziach modelu a uwarunkowaniem układu dla modeli Gaussa-Markova z obserwacjami nieskorelowanymi. Rozpatrywane są przy tym modele z macierzami projektu pełnego i niepełnego rzędu. Wzory wyprowadzone przy użyciu rozkładu macierzy ze względu na wartości szczególne (SVD) wskazują wyraźnie, że te dwa badane pojęcia są wzajemnie niezależne. Przedstawione są metody konstruowania dla danej macierzy projektu macierzy równoważnych pod względem niezawodności wewnętrznej oraz macierzy równoważnych pod względem uwarunkowania. Aby umożliwić analizę uwarunkowania modeli GM stanowiących w ogólności układy sprzeczne, wyprowadzono pseudo-wskaźnik zastępujący wskaźnik uwarunkowania układu powszechnie stosowany w numerycznej algebrze liniowej. Także na podstawie rozkładu SVD zaproponowano wzór określający niezawodność zewnętrzną bazujący na 2-giej normie wektora zniekształceń parametrów indukowanych przez minimalny wykrywalny błąd w danej obserwacji. Dla układów z jednakowymi niezerowymi wartościami szczególnymi wzór ten może być wyrażony poprzez wskaźnik niezawodności wewnętrznej oraz pseudo-wskaźnik uwarunkowania. Z tymi miarami występującymi w postaci jawnej, wzór ukazuje, chociaż jedynie dla powyższych specyficznych układów, charakter wpływu niezawodności wewnętrznej i uwarunkowania modelu na jego niezawodność zewnętrzną. Dowody uzupełniających własności dotyczących pseudo-wskaźnika uwarunkowania oraz 2-giej normy wektora zniekształceń parametrów w układach z minimalnymi ograniczeniami, zamieszczone są w Dodatkach. Teoria ilustrowana jest na przykładach numerycznych.
    Źródło:
    Geodesy and Cartography; 2013, 62, 2; 157-181
    2080-6736
    2300-2581
    Pojawia się w:
    Geodesy and Cartography
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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