The technical features of designing multi­channel systems of the fifth generation

DOI: 10.31673/2412-9070.2020.040311

Abstract

At present, the standardization of mobile communication technologies to lay the foundations of wireless networks 5G, there is a general view of the need to replace the fundamental OFDM technology at the expense of more efficient, which can better operate in 5G conditions. For this purpose, a number of new forms of modulation have been introduced. It should be noted that at the same time, these methods have a basic principle of OFDM technology. The main idea of OFDM technology is to divide the frequency selective channel into a number of narrowband sub-channels. In these subchannels or subcarriers, orthogonal narrowband signals are transmitted in parallel. Since each of these signals undergoes shallow fading, then a fairly simple scalar correction of the channel. The main methods of promising technologies UF-OFDM, FBMC, and GFDM are described, which are logical continuation of OFDMmodulation development. In many ways, FBMC has much in common with CP-OFDM and OFDM, which use a cyclic prefix as a security signal. GFDM is a flexible multi-carrier transmission method, which is largely similar to OFDM. UF-OFDM uses filtering to provide its unique characteristics. An analysis of the prospects for the development of MIMO standards is presented. It is shown that the MU-MIMO specification is one of the most significant technological improvements to MIMO. The MU-MIMO specification is the evelopment of MIMO technology and an attempt to solve the problem of the growing amount of data transmitted over wireless networks. Thanks to it, the entire bandwidth of the network can be effectively used, and users will be able to exchange data at a speed of gigabytes per second. It has been established that the system of antenna chains from four to four and three users is the most productive and effective. The essence of the method of reducing the interval of monitoring the carrier frequency of the synchronization system of the domodulator, based on the use of sliding FFT, which can be proposed in the implementation of the above signal modulation technologies.

Keywords: UF-OFDM; FBMC; GFDM; MIMO; sliding FFT.

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