Institute of Electron Technology
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2189 research outputs found
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Video Streaming Framework, Journal of Telecommunications and Information Technology, 2011, nr 3
Get PDFThe 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
Privacy Preserving and Secure Iris-Based Biometric Authentication for Computer Networks, Journal of Telecommunications and Information Technology, 2011, nr 4
Get PDFThe iris biometrics is considered one of the most accurate and robust methods of the identity verification. The unique iris features of an individual can be presented in a compact binary form which can be easily compared with the reference template to confirm identity. However in contrast to passwords and PINs biometric authentication factors cannot be revoked and changed as they are inherently connected to our characteristics. Once the biometric information is compromised or disclosed it became useless for the purpose of authentication. Therefore there is a need to perform iris features matching without revealing the features itself and the reference template. We propose an extension of the standard iris-based verification protocol which introduces a features and template locking mechanism, which guarantee that no sensitive information is exposed. Presented solutions can be easily integrated into authentication mechanisms used in modern computer networks
Technical Aspects Outline for the Strategy of Launching Digital Broadcasting in Poland on Wave Bands Below 30 MHz, Journal of Telecommunications and Information Technology, 2011, nr 3
Get PDFThe article discusses the state of art knowledge concerning the introduction of DRM in the world and prospects for its further development. It presents the possibility of introducing this system in Poland
Review of Distributed Beamforming, Journal of Telecommunications and Information Technology, 2011, nr 1
Get PDFAs the capabilities of individual nodes in wireless sensor networks increase, so does the opportunity to perform more complicated tasks, such as cooperative distributed beam- forming to improve the range of communications and save precious battery power during the transmission. This work presents a review of the current literature focused on implementing distributed beamformers; covering the calculation of ideal beamforming weights, practical considerations such as carrier alignment, smart antennas based on distributed beamformers, and open research problems in the field of distributed beamforming
A New Short Signature Scheme with Random Oracle from Bilinear Pairings, Journal of Telecommunications and Information Technology, 2011, nr 1
Get PDFIn this paper, we propose a new and efficient short signature scheme from the bilinear pairings. Our scheme isconstructed by bilinear inverse-square Diffie-Hellman problem (BISDHP) and does not require any special hash function. The exact security proofs are also explained in the random Oracle model. We give the implementation and comparison results of our proposed signature scheme with the signature scheme proposed by Boneh, Lynn, Shacham (BLS) and Zhang, Safavi, Susilo (ZSS). Furthermore, we use this signature scheme to construct a ring signature scheme
Sieci i usługi telekomunikacyjne w zarządzaniu kryzysowym. Telekomunikacja i Techniki Informacyjne, 2011, nr 1-2
Get PDFW artykule opisano zasady obiegu informacji, charakterystykę sieci łączności elektronicznej oraz propozycję wykorzystania nowoczesnych usług telekomunikacyjnych w procesie zarządzania kryzysowego
Self-Adaptive Stable Mutation Based on Discrete Spectral Measure for Evolutionary Algorithms, Journal of Telecommunications and Information Technology, 2011, nr 4
Get PDFIn this paper, the concept of a multidimensional discrete spectral measure is introduced in the context of its application to the real-valued evolutionary algorithms. The notion of a discrete spectral measure makes it possible to uniquely define a class of multivariate heavy-tailed distributions, that have recently received substantial attention of the evolutionary optimization community. In particular, an adaptation procedure known from the distribution estimation algorithms (EDAs) is considered and the resulting estimated distribution is compared with the optimally selected referential distribution
Enhancement of Power Efficiency in OFDM System by SLM with Predistortion Technique, Journal of Telecommunications and Information Technology, 2011, nr 4
Get PDFOrthogonal Frequency Division Multiplexing (OFDM) is considered as a strong candidate for future wireless communication because it is marked by its higher frequency multiplicity and greater immunity to multipath fading. However, the main drawback of OFDM is its high amplitude fluctuations measured by peak-to-average power ratio (PAPR), which leads to power inefficiency and requires expensive high power amplifier (HPA) with very good linearity. In this paper, we propose selected mapping (SLM) with predistortion technique to decrease the nonlinear distortion and to improve the power efficiency of the nonlinear HPA. In the proposed method SLM reduces the PAPR and improves the power efficiency, the predistorter improves the bit error rate (BER) performance of the system. The PAPR reduction is possible with SLM when compared with original OFDM. After reducing the PAPR with SLM the data goes into the HPA with and without predistorter. The BER performance curves of SLM method with or without predistorter shows that, predistorter operates more effectively in SLM method than original OFDM system. At 4 dB IBO (input backoff) the conventional method with predistorter achieves 1.8 dB SNR gain than conventional method without a predistorter and at 6 dB IBO the BER performance is towards the ideal linear amplifier. The proposed system will be evaluated for OFDM system in the presence of a nonlinear power amplifier
