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Wyszukujesz frazę "time coding" wg kryterium: Temat

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    Wyświetlanie 1-12 z 12
    Tytuł:
    An adaptive iterative receiver for space-time coding MIMO systems
    Autorzy:
    Teekapakvisit, C.
    Pham, V. D.
    Vucetic, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/309164.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    adaptive equalizer
    iterative detection
    layered space-time coding
    LMS
    PFGLMS
    Opis:
    An adaptive iterative receiver for layered space-time coded (LSTC) systems is proposed. The proposed receiver, based on a joint adaptive iterative detection and decoding algorithm, adaptively suppresses and cancels co-channel interference. The LMS algorithm and maximum a posteriori (MAP) algorithm are utilized in the receiver structure. A partially filtered gradient LMS (PFGLMS) algorithm is also applied to improve the convergence speed and tracking ability of the adaptive detector with a slight increase in complexity. The proposed receiver is analysed in a slow and fast Rayleigh fading channels in multiple input multiple output (MIMO) systems.
    Źródło:
    Journal of Telecommunications and Information Technology; 2006, 1; 54-59
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Employing FPGA DSP blocks for time-to-digital conversion
    Autorzy:
    Kwiatkowski, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/221505.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    time-to-digital converter
    time coding line
    time interval counter
    digital signal processing
    field-programmable gate array
    Opis:
    The paper presents a novel implementation of a time-to-digital converter (TDC) in field-programmable gate array (FPGA) devices. The design employs FPGA digital signal processing (DSP) blocks and gives more than two-fold improvement in mean resolution in comparison with the common conversion method (carry chain-based time coding line). Two TDCs are presented and tested depending on DSP configuration. The converters were implemented in a Kintex-7 FPGA device manufactured by Xilinx in 28 nm CMOS process. The tests performed show possibilities to obtain mean resolution of 4.2 ps but measurement precision is limited to at most 15 ps mainly due to high conversion nonlinearities. The presented solution saves FPGA programmable logic blocks and has an advantage of a wider operation range when compared with a carry chain-based time coding line.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 4; 631-643
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exact pairwise error probability analysis of space-time codes in spatially correlated fading channels
    Autorzy:
    Lamahewa, T. A.
    Kimon, M. K.
    Abhayapala, T. D.
    Kennedy, R. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/309166.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    Gaussian Q-function
    modal correlation
    moment-generating function
    MIMO system
    non-isotropic scattering
    space-time coding
    Opis:
    In this paper, we derive an analytical expression for the exact pairwise error probability (PEP) of a space-time coded system operating over a spatially correlated slow fading channel using a moment-generating function-based approach. This analytical PEP expression is more realistic than previously published exact-PEP expressions as it fully accounts for antenna spacing, antenna geometries (uniform linear array, uniform grid array, uniform circular array, etc.) and scattering models (uniform, Gaussian, Laplacian, Von-Mises, etc.). Inclusion of spatial information provides valuable insights into the physical factors determining the performance of a space-time code. We demonstrate the strength of our new analytical PEP expression by evaluating the performance of two space-time trellis codes proposed in the literature for different spatial scenarios.
    Źródło:
    Journal of Telecommunications and Information Technology; 2006, 1; 60-68
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of supervised learning methods for spike time coding in spiking neural networks
    Autorzy:
    Kasiński, A.
    Ponulak, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/908459.pdf
    Data publikacji:
    2006
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    uczenie nadzorowane
    sieć neuronowa
    kodowanie czasowe
    sekwencja czasowa
    supervised learning
    spiking neural networks
    time coding
    temporal sequences of spikes
    Opis:
    In this review we focus our attention on supervised learning methods for spike time coding in Spiking Neural Networks (SNNs). This study is motivated by recent experimental results regarding information coding in biological neural systems, which suggest that precise timing of individual spikes may be essential for efficient computation in the brain. We are concerned with the fundamental question: What paradigms of neural temporal coding can be implemented with the recent learning methods? In order to answer this question, we discuss various approaches to the learning task considered. We shortly describe the particular learning algorithms and report the results of experiments. Finally, we discuss the properties, assumptions and limitations of each method. We complete this review with a comprehensive list of pointers to the literature.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2006, 16, 1; 101-113
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Soft-Output STBC Decoder for Aeronautical Telemetry
    Autorzy:
    Louёt, Yves
    Othman, Rami
    Skrzypczak, Alexandre
    Powiązania:
    https://bibliotekanauki.pl/articles/309130.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    continuous-phase modulation
    CPM
    pulse amplitude modulation
    PAM
    shaped offset quadrature phase shift keying
    SOQPSK
    space-time block coding
    STBC
    ternary symbol
    Opis:
    Alamouti encoding is a well-known space time block encoding technique used to improve the received signal quality in Rayleigh fading channels. In aeronautical telemetry, this encoding technique is applied to shaped offset quadrature phase shift keying tier generation (SOQPSK-TG) modulation in order to handle the two-antenna issue. It is provided for in telemetry-related IRIG standards. In this paper, we propose a unique decoding architecture for Alamouti-encoded SOQPSK-TG signals, taking advantage of pulse amplitude modulation decomposition with soft and hard outputs. We exploit this result to obtain a Viterbi algorithm (VA) for hard decoding and a soft output Viterbi algorithm (SOVA) for soft and hard decoding, with a twofold benefit: operation using one trellis structure, unlike decoders that are based on the 8-waveforms cross-correlated trellis-coded quadrature modulation (XTCQM) approximation, and very attractive bit error rate performance, as well as a complexity trade-off.
    Źródło:
    Journal of Telecommunications and Information Technology; 2020, 1; 13-20
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of quantization steps of time interpolator in view of temperature changes
    Autorzy:
    Sondej, D.
    Szplet, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/114194.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    time-digital conversion
    two-stage interpolation
    multi-edge coding in independent coding lines
    time counter
    time digitizer
    Opis:
    This paper presents a method of limiting the effect of ambient temperature drift on the measurement uncertainty of a time counter (TC). A change in ambient temperature causes a change in the TC transfer function, i.e. the widths of quantization steps to be exact. Recalibration is a procedure that is then required, but it disturbs the measurement process. However, with the knowledge of the current ambient temperature and having the set of transfer functions identified at different temperatures, it is possible to determine and use the most adequate transfer function and virtually eliminate the temperature impact. For this purpose, three interpolation methods were studied: the nearest neighbor method, linear and polynomial interpolations. A newly evaluated transfer functions were tested in interpolating TC to select the best interpolation method.
    Źródło:
    Measurement Automation Monitoring; 2017, 63, 5; 192-194
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of precise determining the transfer function of picosecond time-to-digital converters
    Autorzy:
    Sondej, Dominik
    Szymanowski, Rafał
    Szplet, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/1848997.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    time-to-digital converter
    equivalent conversion function
    delay line
    multi-edge coding
    wave-union
    Opis:
    We present two main ways to precisely create the equivalent transfer function of picosecond time-to-digital converters based on commonly used method with tapped time coding delay lines. The ways consist either in evaluation of the quantization steps boundaries of the delay lines or in summation of numbers of the line quantization steps. The paper contains results of comprehensive analysis of both methods. The advantage and high versatility of the addition method is demonstrated.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 3; 539-549
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of precise determining the transfer function of picosecond time-to-digital converters
    Autorzy:
    Sondej, Dominik
    Szymanowski, Rafał
    Szplet, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/1849060.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    time-to-digital converter
    equivalent conversion function
    delay line
    multi-edge coding
    wave-union
    Opis:
    We present two main ways to precisely create the equivalent transfer function of picosecond time-to-digital converters based on commonly used method with tapped time coding delay lines. The ways consist either in evaluation of the quantization steps boundaries of the delay lines or in summation of numbers of the line quantization steps. The paper contains results of comprehensive analysis of both methods. The advantage and high versatility of the addition method is demonstrated.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 3; 539-549
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A solution for increasing data rate of Doppler-RAKE system
    Autorzy:
    Nguyen Nguyen, M.
    Modelski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/307797.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    diversity
    Doppler-RAKE
    CDMA
    multi-path
    fast-fading
    spread-time signaling
    multi-user detection
    channel coding
    Opis:
    Doppler-RAKE detection in the CDMA system has been further developed and offers better performances in comparison to conventional RAKE detection, especially in fast-fading environments. Also, the multi-user Doppler-RAKE system works more effectively with channel coding applications. However, by means of exploring the Doppler effect, the system's data rate is decreased. We propose a simple solution to increase the data rate for the system while keeping the Doppler gain.
    Źródło:
    Journal of Telecommunications and Information Technology; 2003, 3; 130-134
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-Way Relaying Cooperative Wireless Networks : Resource Allocation and Performance Analysis
    Autorzy:
    Abrar, M.
    Gui, X.
    Punchihewa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/226891.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    relay network
    relay protocol
    resource allocation
    two-way relaying
    bidirectional relaying
    Analog Network Coding
    Time Division Broadcast
    Opis:
    Relay-based cooperative wireless networks have been widely considered one of the cost-effective solutions to meet the demands in future wireless networks. In order to maximize the overall sum-rate while maintaining proportional fairness among users, we investigate different resource allocation algorithms in two-way relay networks with analog network coding (ANC) protocol and time division broadcast (TDBC) protocol. The algorithms investigated are different from traditional proportional fairness schemes in terms of fairness and computational complexity as we have applied Access Proportional Fairness (APF) and Minimum Rate Proportional Fairness (MRPF) along with load balancing at the relays. A MATLAB simulation has been performed and simulation results show the effectiveness of these algorithms.
    Źródło:
    International Journal of Electronics and Telecommunications; 2013, 59, 3; 229-235
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oprogramowanie diagnostyczno-sterujące interpolacyjnego licznika czasu w układzie programowalnym
    Diagnostic and control software for the interpolating time counter implemented in a programmable device
    Autorzy:
    Grzęda, G.
    Sondej, D.
    Szplet, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/155302.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    precyzyjna metrologia czasu
    oprogramowanie diagnostyczno-sterujące
    kodowanie wielokrotne w niezależnych liniach kodujących
    model warstwowy
    precise time metrology
    diagnostic-control software
    multiedge coding in independent coding lines
    layer model
    Opis:
    W artykule opisano projekt oprogramowania diagnostyczno-sterującego licznika czasu z kodowaniem wielokrotnym w niezależnych liniach kodujących, wykonanego w układzie programowalnym Spartan-6 firmy Xilinx. Przedstawiono sposób sterowania licznikiem czasu, koncepcję oprogramowania sterującego, jego zadania oraz warstwową budowę. Opisano graficzny interfejs użytkownika programu i jego funkcjonalność. Prezentowane są także wyniki badań eksperymentalnych licznika czasu.
    This paper presents the diagnostic and control software of a time interval counter with multi-edge coding in independent coding lines, implemented in the Spartan-6 FPGA device manufactured by Xilinx. The method of time-to-digital conversion [1] is presented along with the design of the time interval counter (Fig. 1). Subsequently, the main goals of the control software, along with its logical structure, are described. The paper shows the layer model (Fig. 2) of the program, reveals the method of communication with the time counter and the way of decoding measurement frames. The bottom-most communication layer transfers the data through USB to the device. The next control layer operates on hardware registers and the measurement layer calibrates the counter and triggers measurements. Finally, the graphic user interface (GUI) layer binds the application together and steers the user interface. The program operates in two main modes: calibration and time interval measurement. Apart from both these modes, the data flow across the layers and the way of saving data generated during counter operation are described. The GUI (Fig. 3) is described as well, showing the main types of operation along with the capabilities of configuring the calibration and measurement processes. Finally, the paper presents the test results of the time counter in both main operation modes (Fig. 4).
    Źródło:
    Pomiary Automatyka Kontrola; 2014, R. 60, nr 7, 7; 441-443
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of Time-Frequency Analysis in Authentication of Digital Audio Recordings
    Autorzy:
    Korycki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/226798.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tampering detection
    audio authenticity analysis
    media authentication
    electric network frequency
    time-frequency analysis
    digital audio forensics
    inverse decoder
    MP3
    compressed audio
    perceptual audio coding
    Opis:
    This paper describes the problem of tampering detection and discusses the main methods used for authenticity analysis of digital audio recordings. For the first topic, two frequency measurement algorithms based on electric network frequency criterion are applied. Time-frequency analysis is used and improved with reassignment method for purpose of visual inspection of modified recordings. The algorithms are shortly described and exemplary plots are presented with interpretation. The last described method, recently proposed, is based on checking frame offsets in compressed audio files.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 3; 257-262
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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