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PAPR reduction and digital predistortion for 5G waveforms in digital satellite payloads

PAPR reduction and digital predistortion for 5G waveforms in digital satellite payloads

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Satellite systems will play an important role in the coming fifth generation (5G) of mobile communications. For a smooth integration of satellite networks into the terrestrial ones, the standardization bodies are pushing for shared spectrum. Therefore, it is of interest to study satellite specific scenarios, the applicability of multicarrier waveforms that have already shown promise to meet the requirements of the future mobile networks. 5G candidate waveforms such as filtered orthogonal frequency division multiplexing (f-OFDM), filter bank multicarrier (FBMC), and universal filtered multicarrier (UFMC) offer sharper out-of-band characteristics, significantly increasing the spectral efficiency. However, like OFDM, these waveforms exhibit a high peak to average power ratio (PAPR). A high PAPR saturates the nonlinear high power amplifier (HPA) which leads to nonlinear distortions in the on-board HPA's output. Moreover, signal clipping is often proposed in the literature to reduce the PAPR. However, clipping itself introduces nonlinear distortions within the signal bandwidth. Digital predistortion (DPD) can be applied to the clipped signal to remove the added nonlinear distortions while keeping the overall PAPR low. This chapter provides the simulation results on the application of the aforementioned waveforms to a satellite communication chain and presents the gains achieved by implementing DPD and clipping together in terms of PAPR, power spectral densities (PSDs), and bit error rates (BERs).

Chapter Contents:

  • 54.1 Introduction
  • 54.2 System model
  • 54.3 PAPR reduction and predistortion method
  • 54.3.1 HPA model
  • 54.3.2 PAPR reduction
  • 54.3.3 Digital predistortion
  • 54.4 Simulations results
  • 54.4.1 Analysis with only DPD
  • 54.4.2 Analysis with only clipping
  • 54.4.3 Analysis with clipping and DPD
  • 54.4.4 Total degradation analysis
  • 54.5 Conclusion
  • References

Inspec keywords: radiofrequency power amplifiers; channel bank filters; nonlinear distortion; 5G mobile communication; satellite communication; OFDM modulation; error statistics

Other keywords: nonlinear high power amplifier; PAPR low; satellite systems; future mobile networks; power spectral densities; terrestrial ones; universal filtered multicarrier; high PAPR; clipped signal; out-of-band characteristics; 5G; filter bank multicarrier; filtered orthogonal frequency division multiplexing; satellite specific scenarios; PAPR reduction; f-OFDM; shared spectrum; mobile communications; digital predistortion; standardization bodies; digital satellite payloads; spectral efficiency; satellite networks; signal bandwidth; multicarrier waveforms; satellite communication chain; signal clipping; nonlinear distortions; coming fifth generation

Subjects: Amplifiers; Filtering methods in signal processing; Modulation and coding methods; Mobile radio systems; Filters and other networks; Other topics in statistics

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