Browsing by Author "Макаренко, А. О."

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    Алгоритм програмної реалізації багатоантенного каналу з завадами
    (Видавництво Львівської політехніки, 2016) Сторчак, К. П.; Макаренко, А. О.; Гринкевич, Г. О.; Примаченко, В. І.
    Викладено матеріали проведених досліджень методів математичного моделювання сучасних систем широкосмугового безпроводового доступу. Наведено опис роботи розробленого алгоритму програмної реалізації багатоантенного каналу. Відмінною рисою цього алгоритму є врахування під час цифрової обробки сигналів кореляційних властивостей багатоантенного каналу зв’язку. The research findings in the sphere of mathematical modeling of modern broadband wireless access have been revealed in the article. Detailed description of algorithm program realized in multiantenna channel has been provided. The distinctive feature of this algorithm is taking into account the digital signal processing correlation properties ofmulti-antenna channel. It is obvious that no country can do without broadband infrastructure. The infrastructure includes broadband digital backbone of modern information economy. Today broadband infrastructure is essential to any modern economy, which plays the same role as water, transport or energy networks. Everything mentioned above more than ever is important for broadband wireless technologies of data transmission (BWDT). The network operated by varieties of protocol IEEE 802.11 is the most common among BWDT The most promising directions are increasing network capacity (standard 802.11ad) and development of protocol IEEE 802.11s standard IEEE 802.11, known as mesh-network. A necessary condition for successful development of complex technical systems for any purpose is the development and widespread adoption of software designing methods by using mathematical modeling. In the simulation environment of the software the simulation model circuit has input, output and processing blocks. Nowadays, BWDT system built according to the standards of 3GPP LTE, IEEE 802.11, and others are rapidly developing. Orthogonal frequency division multiplexing method (OFDM) combines these standards. With the growth of speed of BWDT there is substantial need for development of theMultiple Input Multiple Output (MIMO) method. Based on the model of MIMO-channel program the algorithm of MIMO-channel is realized. While using the algorithm I have obtained the graph of comparing circuit noise immunity of data transmission and range of the signal at the output OFDM-modulator and demodulator at the entrance, after the action on the signal attenuation and interference with the distribution of the communication channel.
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    Метод підвищення завадозахищеності телекомунікаційної системи передачі даних по електромережі
    (Видавництво Львівської політехніки, 2015) Макаренко, А. О.; Гринкевич, Г. О.
    Розглядається вплив індустріальних завад на симетричні лінії мереж електроживлення, використовуваних для створення багатоканальних систем. Пропонується компенсаційний метод для зменшення впливу індустріальних завад на такі системи. Considered the influence of industrial noise on symmetric lines PowerLine at their use to create multichannel systems. Proposed compensation method to reduce the impact of industrial noise on such systems. For today actively developing telecommunication system, which used PowerLine as a medium of data transfer – boundless information environment, what is used in every home. The main problem in creating specific telecommunication systems is a significant level of external noise that takes from the environment and affect the PowerLine, which in fact is the antenna system. The most significant obstacle is the external noise of natural origin (especially lightning) and industrial noise, which create electric ignition systems of automobiles, fluorescent lamp, lifts, welding machines and other electrical appliances. Industrial noise is a complex process with continuous spectrum, which has a log-normal distribution. Obviously, the spectrum of industrial noise rather broad and does not go beyond 1 GHz. House power system within one electrical substation can be seen as a complex antenna system with multiple parts. To substantially reduce the impact of external interference in symmetrical two-wire line, which is appropriate to use the PowerLine proposed in [8] the method of compensation. It uses special devices that receiving external noise and transmitted it’s in the supply line inverted antiphase signal which compensates interference line taken directly from the environment. That is the total noise spectral density of signal lines equal to 0 and will be made full compensation of noise, which is possible only in theory. But in practice implementation errors do not give the possibility to make full compensation interference, but a significant reduction can be achieved. Connection to line two or more devices of noise compensation through a distance willensure evenly magnitude compensating signal interference. The values of the distance betweenthe devices compensate for interference, and their level at the receiver input terminals requireadditional research and calculations.The results can also be useful when creating telecommunication systems with air lines.