Methods to reduce the number of operations of digital signal processing program-configured OFDM-systems 5 generation for reducing peak factor and pulse industrial noise exposure

DOI №______

Abstract

In the article in connection with the adoption of the international standard 5G, which for several years  has been developed jointly by the largest telecommunication and IT corporations in the world, the technical requirements for 5G networks compared with the characteristics of existing LTE networks. It is shown that in order to meet the key requirements for 5G networks, new technological solutions for the radio access network, the basic network, the transport network, subscriber devices, as well as the development of various related technologies are needed. It is determined that OFDM technology, for effective use in 5G networks, requires fundamental changes. However, these changes can be achieved by further increasing the computational complexity. The article presents a method for reducing the computational complexity of the digital processing of signals of software-configurable OFDM systems of the 5th generation, which also effectively allows to deal with the disadvantages of power amplifiers (decrease of the peak factor) and the pulse industrial noise exposure. In the calculation of the efficiency of the IOST and OST, the performance characteristics are in the range of 11 to 24%. The influence of the OFDM-system with orthonormal sparse transformation on the signalto-noise ratio using a channel with frequency-selective fading was conducted. Simulation simulations were performed using VisSim's universal system of block simulation visual mathematical modeling. The effectiveness of the OFDM system with OST compared to the usual OFDM with QPSK modulation, even at low signal-to-noise ratio, is about 17 dB, measured at 10-4 BER.

Keywords: 5G, software-configurable OFDM system, computational complexity, signal-to-noise ratio.

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