NON-ORTHOGONAL MULTIPLE ACCESS BASED ON PARTIAL CODING

Author(s):  
Д.К. МАЗУРЕНКО

Рассмотрены вопросы повышения эффективности использования спектра частот при построении систем сотовой связи 5G и 6G, а также проблемы снижения вычислительных затрат при реализации алгоритма последовательного подавления взаимного влияния сигналов. Подробно проанализирована суть нового принципа неортогонального множественного доступа на основе парциального кодирования, а также проведено его сравнение с методом разделения сигналов по мощности Power Division Non-Orthogonal Multiple Access (Рй-NOMA). Результаты получены с помощью программы «Моделирование Telecomm», предназначенной для численного математического моделирования систем связи на физическом уровне. The article considers the increasing the efficiency of using the frequency spectrum when building 5G and 6G cellular communication systems and the problems of reducing computational costs when implementing an algorithm for sequential suppression of the mutual influence of signals. The essence of the new principle of non-orthogonal multiple access based on partial coding is analyzed in detail, and it is compared with the Power Division Non-Orthogonal Multiple Access (PD-NOMA) method. The results are obtained using the software Modeling Telecomm intended for numerical mathematical modeling of communication systems at the physical level.

Author(s):  
Oxana Vladimirovna Kalambatskaya ◽  
Oleg Nickolaevich Pishchin

The article considers examples of ultra-long propagation of UHF radio waves in mobile cellular communication systems. The phenomena are mainly observed in the Astrakhan region in the spring-summer period (May-June) and are presumably associated with sharp seasonal changes of air temperature followed by rains. The effect of temperature inversion results in changing the refraction index in the surface layer and, as a result, in changing the wave direction as the effect of superrefraction in the surface atmospheric layer. The properties of radio waves in their propagation in the land and sea-water surface waveguide are investigated. The values of the heights of land and sea-water surface tropospheric waveguides for cellular communication systems of different ranges are obtained. The features of existing of tropospheric land and sea-water surface tropospheric waveguides are described. The need to use their properties in the mobile communication systems design is stated.


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