The analytical look of the current technologies of the tropospheric and radio-relay

Abstract

The relevance of the task of creating a mobile combined station of digital tropospheric and satellite communications of the microwave range, which simultane­ ously operates in 2 modes: horizontal communication and direct visibility, substantiates an analytical review of the current state of tropospheric communication in the world. The technical characteristics of the advanced developments of digital troposphere stations and control systems of foreign companies Comtech Systems, Raytheon Corporation, General Dynamics, Advantech Wireless are presented. It is shown that the RTM-100 tropospheric modem, with a bandwidth of 50 Mbit/s and more, which provides stable communications under multipath conditions when using direct error correction turbocompression (FEC) and supports work with Gigabit Ethernet (GbE) data ports and SNMP protocol is the key Elements for creating a new mobile combined digital troposphere and satellite communications station. The analysis of the current state and development trends of radio-relay communication, as well as the spectrum of widespread use of modern digital radio-relay communication. The OptiX RTN 900, a new generation of IP-based digital radio relay system with a split structure, is one of the first systems to support TDM, packet and hybrid transmission platforms. The system supports communication in 2G networks, voice and data services in 3G networks, broadband data services in LTE networks. Radio relay systems of NEC, NERA, Huawei Technologies, ZTE, Nokia Siemens Networks (former Alcatel-Lucent) companies implement adaptive modulation and coding (Adaptive Coding & Modulation — ACM), which allows you to change the parameters of the radio channel when changing the propagation conditions of radio waves and thereby technology AFM allows the operator to reduce their capital costs during the construction of RRL by installing antennas of smaller diameters or by building longer communication intervals. The bandwidth of digital radio relay stations has grown to 5.5 Gb / s (Ericsson) and for this new sections of the millimeter wave range have been mastered: 71…76 GHz, 81...86 GHz. The development of the terahertz frequency range opens up great op­ por­ tunities for a significant increase in throughput and security and secrecy. An analytical analysis showed the promise of creating a mobile combined station of the digital tropospheric and satellite microwave range, corresponding to the development trends of tropospheric and microwave radio communications, is an urgent task for Ukraine.