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Ultima descărcare din IBN: 2023-06-27 17:08 |
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004.056 (229) |
Știința și tehnologia calculatoarelor. Calculatoare. Procesarea datelor (4187) |
SM ISO690:2012 КОБОЗЕВА, Алла, СОКОЛОВ, Артем. Эффективное кодирование группового сигнала в стеганосистемах с множественным доступом. In: Problemele Energeticii Regionale, 2021, nr. 2(50), pp. 101-113. ISSN 1857-0070. DOI: https://doi.org/10.52254/1857-0070.2021.2-50.09 |
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Problemele Energeticii Regionale | ||||||
Numărul 2(50) / 2021 / ISSN 1857-0070 | ||||||
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DOI:https://doi.org/10.52254/1857-0070.2021.2-50.09 | ||||||
CZU: 004.056 | ||||||
Pag. 101-113 | ||||||
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Today, steganographic systems with multiple access are of considerable importance. In such systems, the orthogonal Walsh-Hadamard transform is most often used for multiplexing and dividing channels, which leads to the need for efficient coding of the Walsh-Hadamard transform coefficients for the convenience of their subsequent embedding. The purpose of the research is to develop a theo-retical basis for efficient coding of the embedded signal in steganographic systems with multiple ac-cess with an arbitrary number of users N, based on MC-CDMA technology. This purpose was fulfilled by forming the theoretical basis for constructing effective codes designed to encode the embedded sig-nal in steganographic systems with multiple access. The most important results obtained are the pro-posed and proven relations that determine both the possible values of the Walsh-Hadamard transform coefficients, for a given value of the number of divided channels, and the probability of occurrence of the given values of the Walsh-Hadamard transform coefficients, which allow the construction of effec-tive codes to represent the embedded signal. In the case of the number of divided channels N=4, we propose to use a constant amplitude code that provides a smaller value of the average codeword length in comparison with the Huffman code, while the constructed code has correcting capabilities. The sig-nificance of the obtained results is determined by the possibility of using the developed theoretical basis when constructing effective codes for encoding the embedded signal in steganographic systems with multiple access at an arbitrary value of the number of divided channels N. |
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Cuvinte-cheie steganography, multiple access, Walsh-Hadamard transform, efficient coding, C-code, steganografie, acces multiplu, transformare Walsh-Hadamard, codificare eficientă, cod C, стеганография, множественный доступ, преобразование Уолша-Адамара, эффективное кодирование, C-код |
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