KEYWORDS: Orthogonal frequency division multiplexing, Signal filtering, Modulation, Fourier transforms, Energy efficiency, Signal processing, Optical filters, Electronic filtering
This article proposes a method for improving energy efficiency by reducing the peak power of the emitted signal in systems with DFT-s-OFDM for fiber-optic segments of future mobile networks of the 5G and 6G generation, based on the use of an improved "raised cosine" shaping filter, as well as ZT-DFT-s-OFDM technology for improved energy efficiency. Various new waveforms and modulation schemes are presented that would be both energetically and spectrally efficient. The analysis of the ratio of the peak signal power level to the average level for signals with DFT-s-OFDM in its various modifications in radio-optic networks is presented, various technologies for the formation of DFT-s-OFDM are analyzed depending on the method of access to the subscriber, such as DFDMA, LFDMA and IFDMA, considering the bandwidth extension factor.
KEYWORDS: Modulation, Orthogonal frequency division multiplexing, Radio over Fiber, Signal processing, Energy efficiency, Phase shift keying, Quadrature amplitude modulation, Optical fibers, Interference (communication), Distortion
Future 6G networks will be able to support a wide range of services with different technical requirements and in different frequency bands. To achieve this goal, the use of radio over fiber (RoF) technology is an important foundation for both the transport architecture and the hybrid radio-optical centralized architecture or 6G fronthaul cloud radio access network (CRAN). At the same time, the 6G generated signal processing technologies and modulation schemes must meet the stringent requirements of a mobile data network. In this paper we estimate energy efficiency of DFT-s-OFDM in RoF systems in terms of peak-to-average power ratio (PAPR).
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