RADIOELECTRONIC AND COMPUTER SYSTEMS

The laboratory testbed of a digital simplex radio-relay system of the terahertz range has been studied for the first time in practical terms. It consists of the receiver and transmitter parts of 130÷134 GHz frequency range and a digital modem with a channel data transmission of up to 1200 Mbps for a communication point-to-point distance under normal conditions within 1 km. It is shown that the proposed telecommunication system, which implements the concept of the creation of software-defined radio systems based on Wi-Fi technology, can be highly productive in the next generation mobile communication networks providing the appropriate transmission speeds, reliability, and security. It is studied the parameters of multichannel digital TV signal DVB-C standard when it is transmitted through the testbed of the transmitter and receiver parts of 130 GHz band. The results of the research showed that the application of lower part of terahertz frequency band (130 GHz) with a bandwidth of 24 MHz allows the transmission of three DVB-C television broadcasting channels with a total transport speed of 125 Mbit/s with a high subjective quality of TV programs. The results of the simulation of impulse ultrawideband (IR-UWB) signal transmission by the wireless link of terahertz band are presented. The results of researches of changes of IR-UWB Gaussian monocycle in the transmitter part and its reception by the receiver part of 130.4÷131.5 GHz terahertz band are presented for the first time. On the basis of the results of the research, the requirements for parameters of terahertz wireless link are formulated to ensure acceptable quality of ultrawideband impulse signals receiving. Development of the transmitter and receiver parts of radio relay system of the terahertz range has no direct current analogs in Ukraine. It can provide a significant breakthrough in the development of the telecommunications industry. The obtained research results will also contribute to the development of telecommunications-related industries, in particular: radio astronomy, inter-satellite communication, radar systems, medicine, etc.

terahertz technologies; telecommunication systems; ultra-high bandwidth; transceivers; digital simplex radio relay system; transport distribution networks; mobile communication; DVB-C multichannel digital signal; impulse ultrawideband signal; IR-UWB gener

Jia, S., Yu, X., Hu, H., Yu, J., Guan, P., Da Ros, F., Galili, M., Morioka, T., Oxenkowe, L.K. THz photonic wireless links with 16-QAM modulation in the 375-450 GHz band. Optics Express, 2016, vol. 24, no. 21, pp. 23777–23783.

Kallfass, I., Dan, I., Rey, S., Harati, P., Antes, J., Tessmann, A., Wagner, S., Kuri, M., Weber, R., Massler, H., Leuther, A., Merkle, T., Kürner, T. Towards MMIC-Based 300GHz Indoor Wireless Communication Systems. IEICE Trans. Electron, 2015, vol. E98-C, no. 12, pp. 1081-1090.

Koenig, S., Lopez-Diaz, D., Antes, J., Boes, F., Henneberger, R., Leuther, A., Tessmann, A., Schmogrow, R., Hillerkuss, D., Palmer, R., Zwick, T., Koos, C., Freude1, W., Ambacher, O., Leuthold, J., Kallfass, I. Wireless sub-THz communication system with high data rate. Nature photonics, 2013, vol. 7, no. 12, pp. 977-981.

Xianbin, Y., Asif, R., Piels, M., Zibar, D., Galili, M., Morioka, T., Jensen, P. U., Oxenkowe, L. K. 400-GHz Wireless Transmission of 60-Gb/s Nyquist-QPSK Signals Using UTC-PD and Heterodyne Mixer. IEEE Transactions an terahertz science and technology, 2016, vol. 6, no. 6, pp. 765-770.

Semenova, V., Bespalov, V. Teragercovye Tehnologii dlja Telekommunikacij [Terahertz Technologies for Telecommunications]. Fotonyka – Photonics, 2015, no. 3/51, pp. 126-141.

Hromov, P. Japonskij teragercovyj modem prevysil skorost' v 100 Gbit [Japanese terahertz modem has exceeded the speed of 100 Gbit]. Konferencija Solid State Circuits Conference (ISSCC), SanFrancisko, fevral'-2017. Available at: https://hightech.fm/2017/02/06/thz-transmitters (accessed 6.02.2017).

Avdyeyenko, G. L., Bunin, S. H., Narytnyk, T. M. Terahertsovi tekhnolohiyi v telekomunikatsiynykh systemakh. Chastyna 1. Obhruntuvannya chastotnoho diapazonu, proektuvannya funktsional'nykh vuzliv telekomunikatsiynykh system terahertsovoho diapazonu [Terahertz technologies in telecommunication systems. Part 1. Justification of the frequency range, design of functional nodes of terahertz range telecommunication systems]. Aviacijno-kosmicna tehnika i tehnologia - Aerospace technic and technology, 2018, no. 4(148), pp. 72-91.

Narytnyk, T. M. Rozrobka radioliniyi iz hihabitnoyu propusknoyu zdatnistyu terahertsovoho diapazonu dlya nadvysokoshvydkisnykh rozpodil'chykh merezh dostupu [Development of radio with gigabit bandwidth terahertz range for ultra-high distribution of access networks] Available at: http://report.kpi.ua/uk/0115U002330. (accessed 21.05.2018).

Ghavami, M., Michael, L. B., Kohno, R. Ultra Wideband Signals and Systems in Communication Engineering. John Wiley and Sons Ltd. Publ., 2007. 304 p.