M.A. Kryachko1

1 St. Petersburg State University of Aerospace Instrument Engineering (St. Petersburg, Russia)

1 LUKOIL-Tecnology (Moscow, Russia)

1 mike_kr@mail.ru

The development of sixth-generation communication networks and systems implies the possibility of functioning of terrestrial wireless and satellite networks in a single format. This approach can be realised by eliminating the limited bandwidth of the communication channel and efficient use of the frequency spectrum. To overcome the limitations, it is necessary to expand the total bandwidth up to hundreds of GHz, as well as to develop signal conditioning devices using high-speed digital-to-analogue converters. In addition, it is necessary to develop in-band full-duplex technology that will allow communication nodes to learn or recognise other available channels when transmitting data, thereby reducing latency and improving spectrum efficiency. Improving noise immunity in such developing multichannel radio systems as satellite and cellular, as well as in the broadcasting of large amounts of information in the transmission of video images in digital television of high quality, in videoconferencing as the most promising means of telecommunications and communications. Increasing the efficiency of bandwidth utilisation can occur by increasing the transmission rate in each of the channels of multichannel discrete message transmission systems, or by increasing the number of partial channels while maintaining high reliability of reception. Modeling of spectrally efficient signals with a high rate of decline of the energy spectrum level while ensuring the necessary reliability of message reception provides the fulfillment of the goal. The paper presents the results of modeling of spectrally efficient signals based on atomic functions, which allowed to form orthogonal sequences similar to Walsh, Haar functions. The effect is achieved by specifying the energy concentration in the frequency band and providing the required rate of decay of the out-of-band radiation level. The introduction of inter-symbol interference leads to a decrease in the value of the peak factor of oscillations, which is very important in radio systems with limited energy resources. The technique of numerical finding of forms of spectrally effective signals with amplitude-phase modulation, including signals with inter-symbol interference on the basis of atomic functions Kravchenko-Rvachev, the use of which allows to develop modems operating in frequency-limited channels of prospective networks 6G. When synthesising spectrally efficient signals with amplitude and phase manipulation of 2T duration in each quadrature channel, the value of the oscillation peak factor is reduced, the value of the frequency bandwidth is reduced and the required rate of decay of the out-of-band radiation level is achieved. The use of spectrally efficient signals based on atomic functions with inter-symbol interference in quadrature channels provides rates of decline in the level of out-of-band emissions significantly higher than those of signals with Gaussian FM with manipulation with minimum frequency shift.

Kryachko M.A. Spectral characteristics and noise immunity of appearance of spectrally efficient signals of advanced telecommunication systems. Information-measuring and Control Systems. 2025. V. 23. № 4. P. 36−48. DOI: https://doi.org/10.18127/j20700814-202504-05 (in Russian)

1. Amoroso F. Pulse and Spectrum Manipulation in the Minimum (Frequency) Shift Keying (MSK) Format. IEEE Transactions on Communications. March 1976. V. 24. № 3. P. 381−384. DOI: 10.1109/TCOM.1976.1093294.
2. Kalet I. A Look at Crosstalk in Quadrature-Carrier Modulation Systems. IEEE Transactions on Communications. September 1977. V. 25. № 9. P. 884−892. DOI: 10.1109/TCOM.1977.1093925.
3. Huang J.C.Y., Feher R., Gendron M. Techniques to Generate ISI and Jitter-free Bandlimited Nyquist Sygnals and Method to Analyze Jitter Effects. IEEE Trans. Magn. November 1979. V. COM-27. № 11. P. 1700−1711.
4. Makarov S.B., Tsikin I.A. Peredacha diskretnykh soobshchenii po radiokanalam s ogranichennoi polosoi propuskaniya. M.: Radio i svyaz. 1988. 304 s. (in Russian)
5. Sputnikovaya svyaz i veshchanie: Cpravochnik. Pod red. L.Ya. Kantora M.: Radio i svyaz. 1997. 528 s. (in Russian)
6. Sklyar B. Tsifrovaya svyaz. Teoreticheskie osnovy i prakticheskoe primenenie: Per. s angl. M.: Izdatelskii dom Vilyams. 2003. 1104 c. (in Russian)
7. Kryachko M.A. Predlozheniya po povysheniyu spektralnoi effektivnosti signalov sistem podvizhnoi radiosvyazi. Voprosy radioelektroniki. Ser. Tekhnika televideniya. 2022. № 2. S. 71−78. (in Russian)
8. Berdyshev V.P., Filatov V.I., Zakutin A.A., Pugachev I.V. Matematicheskaya model vychisleniya funktsii neopredelennosti mnogochastotnykh kogerentnykh zondiruyushchikh signalov dlya diagnostirovaniya korotkovolnovykh radiokanalov. Informatsionno-izmeritelnye i upravlyayushchie sistemy. 2024. № 1. S. 6−14. DOI: https://doi.org/10.18127/j20700814-202401-02. (in Russian)
9. Sebekin G.V., Maslov A.A., Shchurkov A.O. Modelirovanie sovmestnogo obsluzhivaniya multiservisnogo trafika realnogo vremeni i elastichnogo trafika dannykh v setyakh na baze kosmicheskikh apparatov s vysokoi propusknoi sposobnostyu. Informatsionno-izmeritelnye i upravlyayushchie sistemy. 2024. № 2. S. 11−22. DOI: https://doi.org/10.18127/j20700814-202401-02. (in Russian)
10. Churikov D.V., Kravchenko V.F. Tsifrovaya obrabotki signalov atomarnymi funktsiyami i veivletami. M.: Tekhnosfera. 2019. 182 s. (in Russian)
11. Peter Hammarberg, Julia Vinogradova. Architecture, Protocols and Algorithms for Location-Aware Services in Beyond 5G Networks. Cornell University. 2022. URL: https://arxiv.org/pdf/2211.14781.pdf. (27.02.2024).