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Wyświetlanie 1-15 z 17
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:
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:
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:
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:
Selection of Wavelet Video Codec Parameters to Optimize Coding Time
Autorzy:
Popławski, A.
Powiązania:
https://bibliotekanauki.pl/articles/226134.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optimization
wavelet video coding
scalability
Opis:
In the paper, results of experimental research on wavelet video codec are presented. The author has put emphasis on the optimal selection of the coder parameters to optimize the coding time. The author has used six test sequences (Basket, City, Crew, Harbour, Ice and Soccer in 352x288, 30 fps) for the experiments. The sequences used in the research are commonly used to assess the effectiveness of video sequence compression. The measurement of the image quality is based on the PSNR. The results of optimal selection of wavelet video codec parameters due to the coding time are presented. The main goal of the paper is to show the coder parameters that provide the best values of the PSNR for a reduced coding time.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 4; 341-349
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
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:
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:
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:
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:
Bezpośredni przetwornik czas-liczba z kodowaniem wielokrotnym
A direct time-to-digital converter with multiple coding
Autorzy:
Szplet, R.
Sondej, D.
Grzęda, G.
Powiązania:
https://bibliotekanauki.pl/articles/151174.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
precyzyjna metrologia czasu
przetwornik czas-liczba
metoda kodowania wielokrotnego
układy FPGA
precise time metrology
time-to-digital converter
wave union method
FPGA devices
Opis:
W artykule opisane są projekt i wyniki badań przetwornika czas-liczba o rozdzielczości 5,3 ps (1 LSB) i zakresie pomiarowym 428 ps. Do przetwarzania czasowo-cyfrowego użyta została metoda kodowania wielokrotnego. Metoda ta umożliwia pokonanie ograniczeń technologicznych współczesnych układów scalonych i uzyskanie wartości rozdzielczości mniejszej niż czas propagacji pojedynczej komórki linii kodującej. Przetwornik został zrealizowany w układzie programowalnym Spartan-6 firmy Xilinx.
This paper presents the implementation and tests results of a time-to-digital converter based on the wave union method and implemented in Spartan-6 FPGA (Xilinx). The converter has the resolution of 5,3 ps (1 LSB) in the measurement range of 428 ps and the integral nonlinearity of 3,8 LSB (Fig. 7). In the wave union method, contrary to the typical conversion methods with a single coding, the resolution is lower than the FPGA cell delay thanks to coding several transitions of the time event signal (Fig. 2). In addition, the linearity of conversion is increased by reducing the width of wide bins. Although, using a multi-transition pattern gives better performance, it also brings more problems to be solved. The main problems such as implementation of a pattern generator for certain amount of transitions, minimal delays between transitions and elimination of bubble errors are discussed in this paper. The pattern generator (Fig. 3) is implemented with use of a carry chain. It enables controlling the pattern by means of diagnostic and measurement software. Bubble errors (Fig. 4) are eliminated with a fast asynchronous encoder (Fig. 5). The diagnostic-control software (Fig. 6) allows to configure the pattern generator, launch the measurement session and generate a text file with all information needed to calculate conversion characteristics of the time-to-digital converter.
Źródło:
Pomiary Automatyka Kontrola; 2013, R. 59, nr 8, 8; 842-844
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
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:
Time-course analysis of the artemisinin biosynthesis, and expression of genes coding for artemisinin pathway enzymes, in response to exogenous salicylic and gibberellic acids
Autorzy:
Mehrjerdi, M.Z.
Bihamta, M.-R.
Omidi, M.
Naghavi, M.-R.
Soltanloo, H.
Powiązania:
https://bibliotekanauki.pl/articles/80045.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
artemisinin
biosynthetic pathway
elicitor
malaria
medicinal plant
secondary metabolite
Artemisia annua
salicylic acid
gibberellic acid
gene coding
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2015, 96, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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