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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">radioelectronics</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений России. Радиоэлектроника</journal-title><trans-title-group xml:lang="en"><trans-title>Journal of the Russian Universities. Radioelectronics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1993-8985</issn><issn pub-type="epub">2658-4794</issn><publisher><publisher-name>Saint Petersburg Electrotechnical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32603/1993-8985-2021-24-5-22-35</article-id><article-id custom-type="elpub" pub-id-type="custom">radioelectronics-552</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>РАДИОТЕХНИЧЕСКИЕ СРЕДСТВА ПЕРЕДАЧИ, ПРИЕМА И ОБРАБОТКИ СИГНАЛОВ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>RADIO ELECTRONIC FACILITIES FOR SIGNAL TRANSMISSION, RECEPTION AND PROCESSING</subject></subj-group></article-categories><title-group><article-title>Когерентный прием неортогональных спектрально-эффективных многочастотных сигналов при использовании алгоритма с обратной связью по решению</article-title><trans-title-group xml:lang="en"><trans-title>Coherent Detection of Non-Orthogonal Spectrally Efficient Multicarrier Signals Using a Decision Feedback Algorithm</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7006-9634</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Макаров</surname><given-names>С. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Makarov</surname><given-names>S. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Макаров Сергей Борисович – доктор технических наук (1991), профессор (1994) Высшей школы прикладной физики и космических технологий</p><p>ул. Политехническая, д. 29, Санкт-Петербург, 195251, Россия</p></bio><bio xml:lang="en"><p>Sergey B. Makarov, Dr Sci. (Eng.) (1991), Professor (1994) of the Higher school of  applied physics and space technologies</p><p>29 Polytechnicheskaya St., St Petersburg 195251, Russia</p></bio><email xlink:type="simple">makarov@cee.spbstu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3398-3616</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Завьялов</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Zavjalov</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Завьялов Сергей Викторович – кандидат технических наук (2015), доцент (2020) Высшей школы прикладной физики и космических технологий</p><p>ул. Политехническая, д. 29, Санкт-Петербург, 195251, Россия</p></bio><bio xml:lang="en"><p>Sergey V. Zavjalov, Cand. Sci. (Eng.) (2015), Associate Professor (2020) of the Higher school of applied physics and space technologies</p><p>29 Polytechnicheskaya St., St Petersburg 195251, Russia</p></bio><email xlink:type="simple">zavyalov_sv@spbstu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6395-9492</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Нгуен</surname><given-names>Д. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Nguyen</surname><given-names>D. C.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Нгуен Дак Кы – аспирант</p><p>ул. Кау Гиай, д. 3, р-н Донг Да, Ханой, Вьетнам</p></bio><bio xml:lang="en"><p>Dac Cu Nguyen, post-graduate student</p><p>3 Cau Giay St., Dong Da District, Hanoi, Vietnam</p></bio><email xlink:type="simple">daccu91.spb@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3401-2718</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Овсянникова</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Ovsyannikova</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Овсянникова Анна Сергеевна – аспирантка Высшей школы прикладной физики и космических технологий</p><p>ул. Политехническая, д. 29, Санкт-Петербург, 195251, Россия</p></bio><bio xml:lang="en"><p>Anna S. Ovsyannikova, post-graduate student of the Higher school of applied physics and space technologies</p><p>29 Polytechnicheskaya St., St Petersburg 195251, Russia</p></bio><email xlink:type="simple">ovsyannikova_as@spbstu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Санкт-Петербургский политехнический университет Петра Великого</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Peter the Great St Petersburg Polytechnic University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Университет транспорта и коммуникаций</institution><country>Вьетнам</country></aff><aff xml:lang="en"><institution>University of Transport and Communications</institution><country>Viet Nam</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>28</day><month>11</month><year>2021</year></pub-date><volume>24</volume><issue>5</issue><fpage>22</fpage><lpage>35</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Макаров С.Б., Завьялов С.В., Нгуен Д.К., Овсянникова А.С., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Макаров С.Б., Завьялов С.В., Нгуен Д.К., Овсянникова А.С.</copyright-holder><copyright-holder xml:lang="en">Makarov S.B., Zavjalov S.V., Nguyen D.C., Ovsyannikova A.S.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://re.eltech.ru/jour/article/view/552">https://re.eltech.ru/jour/article/view/552</self-uri><abstract><sec><title>Введение</title><p>Введение. В настоящее время спектрально-эффективное частотное мультиплексирование (Spectrally efficient frequency division multiplexing – SEFDM) является многообещающей технологией, используемой для повышения спектральной эффективности и скорости передачи информации. Алгоритмы приема SEFDMсигналов можно разделить на 2 класса: поэлементный когерентный прием и прием всей информационной посылки. Первый метод более прост, но обладает низкой помехоустойчивостью. При приеме всей посылки возможно получение высокой энергетической эффективности, но реализация такого приема очень сложна и не позволяет реализовать высокие абсолютные скорости передачи сообщений.</p></sec><sec><title>Цель работы</title><p>Цель работы. Рассмотрение компромиссного решения задачи когерентного приема SEFDM-сигналов в условиях существенной межканальной интерференции, а именно использование на каждой поднесущей частоте итерационного алгоритма поэлементной обработки с обратной связью по решению.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Описание работы демодулятора решающего устройства выполнено аналитическим методом. Имитационная модель передачи SEFDM-сигналов с использованием в приемнике алгоритма поэлементной обработки с обратной связью по решению построена в среде MatLab.</p></sec><sec><title>Результаты</title><p>Результаты. Результаты моделирования показали, что предложенный алгоритм является достаточно эффективным. При допустимой вероятности ошибок p =102…103 энергетический выигрыш достигает значений 0.2…7.5 дБ для различного неортогонального разноса поднесущих частот. В то же время эффективность алгоритма обнаружения с обратной связью по решению оказывается существенно ниже, чем при приеме всей информационной посылки.</p></sec><sec><title>Заключение</title><p>Заключение. Предложенный алгоритм приема может быть использован в будущих поколениях мобильной связи, в которых требуются высокие скорости передачи. Благодаря снижению вычислительной сложности алгоритма возможно обеспечить меньшее энергопотребление мобильных устройств.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. Spectrally efficient frequency division multiplexing (SEFDM) is a promising technology for improving spectral efficiency. Since SEFDM signals transmitted on subcarriers are not orthogonal, interchannel interference occurs due to the mutual influence of signals transmitted on adjacent subcarriers. Algorithms for receiving SEFDM signals can be distinguished into element-by-element coherent detection and maximum-likelihood sequence estimation (MLSE). The former method, although being simpler, is characterized by a low bit error rate performance. The latter method, although providing for a higher energy efficiency, is more complicated and does not allow high absolute message rates.</p></sec><sec><title>Aim</title><p>Aim. To consider a trade-off solution to the problem of coherent detection of SEFDM signals under the condition of significant interchannel interference, namely, the use of an iterative algorithm of element-by-element processing with decision feedback at each subcarrier frequency.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. Analytical expressions for the operation of a demodulator solver were derived. A simulation model for transmission of SEFDM signals was built in the MatLab environment, including element-by-element detection with decision feedback.</p></sec><sec><title>Results</title><p>Results. The simulation results confirmed the efficiency of the proposed algorithm. For error probabilities p =102…103, the energy gains reach values from 0.2 to 7.5 dB for different values of the non-orthogonal subcarrier spacing. At the same time, the efficiency of the detection algorithm with decision feedback turns out to be significantly lower than that when using the detection algorithm MLSE.</p></sec><sec><title>Conclusion</title><p>Conclusion. The proposed detection algorithm can be used in future generations of mobile communications, which require high transmission rates. By reducing the computational complexity of the algorithm, it is possible to provide for a lower power consumption of mobile devices.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>когерентный</kwd><kwd>неортогональный</kwd><kwd>SEFDM</kwd><kwd>BER</kwd><kwd>итерационный алгоритм</kwd><kwd>обратная связь</kwd></kwd-group><kwd-group xml:lang="en"><kwd>coherent</kwd><kwd>non-orthogonal</kwd><kwd>SEFDM</kwd><kwd>BER</kwd><kwd>iterative algorithm</kwd><kwd>feedback</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке стипендии Президента Российской Федерации молодым ученым и аспирантам, осуществляющим перспективные научные исследования и разработки по приоритетным направлениям модернизации российской экономики на 2021–2023 гг. (СП-1577.2021.3)</funding-statement><funding-statement xml:lang="en">The results of the work were obtained with the support of the scholarship of the President of the Russian Federation to young scientists and graduate students carrying out promising research and development in priority areas of modernization of the Russian economy for 20212023 (СП-1577.2021.3).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Modulation formats and waveforms for 5G networks: Who will be the heir of OFDM?: An overview of alternative modulation schemes for improved spectral efficiency / P. Banelli, S. Buzzi, G. Colavolpe, A. Modenini, F. Rusek, A. Ugolini // IEEE Signal Processing Magazine. 2014. Vol. 31, iss. 6. P. 80–93. doi: 10.1109/MSP.2014.2337391</mixed-citation><mixed-citation xml:lang="en">Banelli P., Buzzi S., Colavolpe G., Modenini A., Rusek F., Ugolini A. 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