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Tytuł:
Network-on-Multi-Chip (NoMC) with Monitoring and Debugging Support
Autorzy:
Łuczak, A.
Stępniewski, M.
Siast, J.
Domański, M.
Stankiewicz, O.
Kurc, M.
Konieczny, J.
Powiązania:
https://bibliotekanauki.pl/articles/307888.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
debugging
FPGA
multi-chip
video coding
Opis:
This paper summarizes recent research on network-on-multi-chip (NoMC) at Poznań University of Technology. The proposed network architecture supports hierarchical addressing and multicast transition mode. Such an approach provides new debugging functionality hardly attainable in classical hardware testing methodology. A multicast transmission also enables real-time packet monitoring. The introduced features of NoC network allow to elaborate a model of hardware video codec that utilizes distributed processing on many FPGAs. Final performance of the designed network was assessed using a model of AVC coder and multi-FPGA platforms. In such a system, the introduced multicast transmission mode yields overall gain of bandwidth up to 30%. Moreover, synthesis results show that the basic network components designed in Verilog language are suitable and easily synthesizable for FPGA devices.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 3; 81-86
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Standardization of the compact model coding: non-fully depleted SOI MOSFET example
Autorzy:
Grabiński, W.
Tomaszewski, D.
Lemaitre, L.
Jakubowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/308862.pdf
Data publikacji:
2005
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
Verilog-AMS
compact model coding
SOI MOSFET
Opis:
The initiative to standardize compact (SPICE-like) modelling has recently gained momentum in the semiconductor industry. Some of the important issues of the compact modelling must be addressed, such as accuracy, testing, availability, version control, verification and validation. Most compact models developed in the past did not account for these key issues which are of highest importance when introducing a new compact model to the semiconductor industry in particular going beyond the ITRS roadmap technological 100 nm node. An important application for non-fully depleted SOI technology is high performance microprocessors, other high speed logic chips, as well as analogue RF circuits. The IC design process requires a compact model that describes in detail the electrical characteristics of SOI MOSFET transistors. In this paper a non-fully depleted SOI MOSFET model and its Verilog-AMS description will be presented.
Źródło:
Journal of Telecommunications and Information Technology; 2005, 1; 135-141
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fully spatial and SNR scalable, SPIHT-based image coding for transmission over heterogenous networks
Autorzy:
Danyali, H.
Mertins, A.
Powiązania:
https://bibliotekanauki.pl/articles/307743.pdf
Data publikacji:
2003
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
wavelet image coding
scalability
SPIHT
progressive transmission
multiresolution
Opis:
This paper presents a fully scalable image coding scheme based on the set partitioning in hierarchical trees (SPIHT) algorithm. The proposed algorithm, called fully scalable SPIHT (FS-SPIHT), adds the spatial scalability feature to the SPIHT algorithm. It provides this new functionality without sacrificing other important features of the original SPIHT bitstream such as: compression efficiency, full embeddedness and rate scalability. The flexible output bitstream of the FS-SPIHT encoder which consists of a set of embedded parts related to different resolutions and quality levels can be easily adapted (reordered) to given bandwidth and resolution requirements by a simple parser without decoding the bitstream. FS-SPIHT is a very good candidate for image communication over heterogenous networks which requires high degree of scalability from image coding systems.
Źródło:
Journal of Telecommunications and Information Technology; 2003, 2; 92-98
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Video Transmission Using Network Coding
Autorzy:
Asís López-Fuentes de, F.
Cabrera-Medina, C.
Powiązania:
https://bibliotekanauki.pl/articles/308479.pdf
Data publikacji:
2012
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
communication networks
information theory
network coding video streaming
Opis:
Network coding is a new technique in the field of information theory and coding theory. This emerging technique offers great benefits in the communication networks such as increased throughput and energy savings. In this paper, we evaluate network coding for video transmission scenarios. In these scenarios, the source nodes encode the video packets, while the intermediate nodes implement network coding before forwarding the encoded packets to the end nodes. Finally, the end nodes decode the received packets in order to recovery the original video. H.264/MPEG-4 AVC is used as the video compression standard in this work. We have used the network simulator (NS-2) for our simulations. Our results show that network coding improves the system throughput, reduces the packet loss and improves the video quality in the end nodes.
Źródło:
Journal of Telecommunications and Information Technology; 2012, 1; 50-57
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Benchmarking image codecs by assessment of coded test images: the development of test images and new objective quality metrics
Autorzy:
Punchihewa, A.
Bailey, D. G.
Hodgson, R. M.
Powiązania:
https://bibliotekanauki.pl/articles/309074.pdf
Data publikacji:
2006
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
image quality
artefacts
subjective
objective
coding
metric
blockiness
blur
ringing
Opis:
Objective quality measures are required for benchmarking codec performance. Our aim was to develop a simple, accurate method capable of rapidly measuring the degree of blockiness, edge-blur and ringing due to image compression. Two test images were designed to emphasise these artefacts. The efficacy of the new metrics is demonstrated using a JPEG codec at a range of compression levels.
Źródło:
Journal of Telecommunications and Information Technology; 2006, 1; 11-16
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Secure Biometric Verification Station Based on Iris Recognition
Autorzy:
Czajka, A.
Piech, K.
Powiązania:
https://bibliotekanauki.pl/articles/309361.pdf
Data publikacji:
2012
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
feature selection
application of biometrics
iris recognition
Zak-Gabor-based iris coding
Opis:
This paper describes an application of the Zak-Gabor-based iris coding to build a secure biometric verification station (SBS), consisting of a professional iris capture camera, a processing unit with specially designed iris recognition and communication software, as well as a display (LCD). Specially designed protocol controls the access to the station and secures the communication between the station and the external world. Reliability of the Zak-Gabor-based coding, similarly to other wavelet-based methods, strongly depends on appropriate choice of the wavelets employed in image coding. This choice cannot be arbitrary and should be adequate to the employed iris image quality. Thus in this paper we propose an automatic iris feature selection mechanism employing, among others, the minimum redundancy, maximum relevance (mRMR) methodology as one, yet important, step to assess the optimal set of wavelets used in this iris recognition application. System reliability is assessed with approximately 1000 iris images collected by the station for 50 different eyes.
Źródło:
Journal of Telecommunications and Information Technology; 2012, 3; 40-49
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Incoherent Discriminative Dictionary Learning for Speech Enhancement
Autorzy:
Shaheen, D.
Dakkak, O. A.
Wainakh, M.
Powiązania:
https://bibliotekanauki.pl/articles/308116.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
ADMM
l1 minimization algorithms
sparse coding
speech enhancement
supervised dictionary learning
Opis:
Speech enhancement is one of the many challenging tasks in signal processing, especially in the case of nonstationary speech-like noise. In this paper a new incoherent discriminative dictionary learning algorithm is proposed to model both speech and noise, where the cost function accounts for both “source confusion” and “source distortion” errors, with a regularization term that penalizes the coherence between speech and noise sub-dictionaries. At the enhancement stage, we use sparse coding on the learnt dictionary to find an estimate for both clean speech and noise amplitude spectrum. In the final phase, the Wiener filter is used to refine the clean speech estimate. Experiments on the Noizeus dataset, using two objective speech enhancement measures: frequency-weighted segmental SNR and Perceptual Evaluation of Speech Quality (PESQ) demonstrate that the proposed algorithm outperforms other speech enhancement methods tested.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 3; 42-54
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variable-Weight Optical Code Division Multiple Access System using Different Detection Schemes
Autorzy:
Seyedzadeh, S.
Moghaddasi, M.
Anas, S. B. A.
Powiązania:
https://bibliotekanauki.pl/articles/308681.pdf
Data publikacji:
2016
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
AND detection
direct detection
QoS differentiation
spectral amplitude coding
variable-weight OCDMA
Opis:
In this paper a Variable Weight OCDMA (VW-OCDMA) system using KS code with Direct Decoding (DD), Complementary Subtraction (CS) and AND subtraction detections is proposed. System performance is analyzed using mathematical approximation and software simulation. In mathematical analysis, the eects of Phase-Induced Intensity Noise, shot noise and thermal noise are taken into account. Bit Error Rate of dierent users is plotted as a function of received optical power per chip with varying the bit rates and number of active users. It has been shown that for dierent bit rates and number of users, system using DD has better performance than the system applying CS and AND detection. Using DD scheme, the number of active users are 100 while this value is 27 and 25 in case of using CS and AND detection, respectively, when the received optical power per chip is -10 dBm.
Źródło:
Journal of Telecommunications and Information Technology; 2016, 3; 50-59
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Systematic-RLNC Based Secure and QoS Centric Routing Scheme for WSNs
Autorzy:
Notom, Ajaykumar
Mrinal, Sarvagya
Parag, Prandkar
Powiązania:
https://bibliotekanauki.pl/articles/308795.pdf
Data publikacji:
2019
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
multi generation mixing
systematic random linear network coding
secure communication
QoS
WSN
Opis:
In this paper a highly robust and efficient systematic-random linear network coding (S-RLNC) routing scheme is proposed. Unlike classic security systems, the proposed S-RLNC transmission model incorporates an advanced pre-coding and interleaving concept followed by multigeneration mixing (MGM) based data transmission to assure secure and QoS efficient communication. The proposed S-RLNC MGM based routing scheme exhibits higher throughput (99.5-100%) than the existing NCC-ARQ-WSN protocol (80%). Unlike NCC-ARQ-WSN, the proposed model incorporates multiple enhancements, such as RLNC concept, systematic network coding, MGM concept, IBF provision and redundant packet optimization. Combined, all these optimizations have strengthened the proposed S-RLNC MGM to exhibit optimum performance for secure and QoS-centric communication over WSNs.
Źródło:
Journal of Telecommunications and Information Technology; 2019, 4; 55-64
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Video Streaming Framework
Autorzy:
Buchowicz, A.
Galiński, G.
Powiązania:
https://bibliotekanauki.pl/articles/307895.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
error resilience and concealment
H.264/AVC standard
media delivery over IP networks
video coding
Opis:
The framework for testing video streaming techniques is presented in this paper. Short review of error resilience and concealments tools available for the H.264/AVC standard is given. The video streaming protocols and the H.264 payload format are also described. The experimental results obtained with the framework are presented in this paper too.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 3; 102-108
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method for Determining Broadcaster Advised Emergency Wake-up Signal for ISDB-T Digital Television Receivers
Autorzy:
Takahashi, Satoshi
Powiązania:
https://bibliotekanauki.pl/articles/308586.pdf
Data publikacji:
2019
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
binary asymmetric channel
emergency warning system (EWS)
intermittent reception
transmission and modulation coding configuration (TMCC)
Opis:
There is a way to automatically wake up television receivers when a broadcaster sends out an emergency alert. In the Integrated Services Digital Broadcasting-Terrestrial (ISDB-T) digital television standard, the emergency wake-up procedure is called an Emergency Warning System (EWS). In ISDB-T, the special signal is embedded in a control message known as transmission and modulation configuration control (TMCC). However, improper identification of the wake-up signal, often encountered in mobile reception, leads to unnecessary wake ups. In this paper, a method of reliably determining a wake-up signal is proposed by assuming that broadcasters will not change the TMCC message except for the wake-up signal when the broadcaster sends out an emergency alert. A change in the wake-up bit leads to variation parity, and the proposed method also relies on such variations. Mutual information to be obtained by the wake-up receiver is evaluated using the memoryless binary asymmetric channel model. Results showed that the proposed method provided mutual information even at a Eb/N₀ being lower than 10 dB. Mutual information of the proposed method with intermittent reception is also analyzed as a function of the duty ratio of the intermittent receiver.
Źródło:
Journal of Telecommunications and Information Technology; 2019, 1; 103-112
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of No-Reference Video Quality Metrics for HEVC Compression
Autorzy:
Rouis, K.
Leszczuk, M.
Janowski, M.
Papir, Z.
Tahar, J. B. H.
Powiązania:
https://bibliotekanauki.pl/articles/307568.pdf
Data publikacji:
2016
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
High Efficiency Video Coding (HEVC)
No-Reference metrics
Quality of Experience (QoE)
Video Quality Assessment
Opis:
The paper proposes a No-Reference (NR) quality assessment measurement originally developed for H.264, used for High Efficiency Video Coding (HEVC). In particular, authors present an investigation of NR metrics to objectively estimate the perceptual quality of a set of processed video sequences. The authors take into account typical distortions introduced by the block-based coding approaches like HEVC codec. The underlying processing used for the quality assessment considers the blockiness caused by the boundaries of each coded block and the blurring as a lack of spatial details. The correlation between the NR quality metrics and the well-known and most widely used objective metric, the Video Quality Model (VQM), is performed to validate the quality prediction accuracy based on the provided scores. The Pearson correlation coefficients obtained stand for promising results for different types of videos.
Źródło:
Journal of Telecommunications and Information Technology; 2016, 1; 22-28
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
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:
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

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