Dac Cu Nguyen 1, A.S. Ovsyannikova2, S.V. Zavjalov 3, S.V. Volvenko 4, E.N. Smirnova 5

1−5 Peter the Great St. Petersburg Polytechnic University (Saint-Petersburg, Russia)

1 daccu91.spb@gmail.com; 2 ovsyannikova_as@spbstu.ru; 3,4 zavyalov_sv@spbstu.ru; 5 smirnova.en1@spbstu.ru

Currently, a promising technology for increasing spectral efficiency is spectrally efficient frequency division multiplexing (SEFDM).

SEFDM signals have a high peak-to-average power ratio (PAPR). The PAPR can be reduced by hard and soft clipping methods. The aim of this work is to compare the effectiveness of soft and hard clipping methods for reducing the signal PAPR based on an estimate of the bit error probability and the falloff rate of out-of-band radiation.

Simulation modeling of information transmission using spectrally efficient multi-frequency signals withPAPR reduction methods on transmission was held. Simulation results show that for SEFDM with optimal envelope, using soft clipping method for PAPR reduction increase the roll-off rate of the out-of-band emission (OOBE) compared to hard clipping method, thereby increasing the spectral efficiency. Besides that, for SEFDM with optimal envelope, soft clipping method also slightly reduces the probability of bit errors when the PAPR reduction value is between 2-6 dB. However, for SEFDM with rectangular envelope, soft clipping method increases the probability of bit errors.

The results obtained can be used to select an appropriate method PAPRclipping that meets the requirements for the bit error probability and out-of-band falloff rate.

Dac Cu Nguyen, Ovsyannikova A.S., Zavjalov S.V., Volvenko S.V., Smirnova E.N. Features of using SEFDM signals with optimal envelope under conditions of hard-clipping and soft-clipping on the transmitting device. Radiotekhnika. 2020. V. 84. № 12(24). P. 52−61. DOI: 10.18127/j00338486-202012(24)-05 (In Russian).

1. Nee, R.V. and Prasad R. OFDM for wireless multimedia communications. Artech House, Inc. 2000.
2. Rashich A. and Gorbunov S. Computational Complexity Analysis of SEFDM Time and Frequency Domain Equalizers. 2019 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech). St. Petersburg, Russia. 2019. Р. 94-97. DOI: 10.1109/EExPolytech.2019.8906828.
3. Gelgor A., Gorlov A. and Nguyen V.P. Performance analysis of SEFDM with optimal subcarriers spectrum shapes. 2017 IEEE International Black Sea Conference on Communications and Networking (BlackSeaCom). Istanbul. 2017. Р. 1-5. DOI: 10.1109/BlackSeaCom.2017.8277680.
4. Rodrigues M. and Darwazeh I. A spectrally efficient frequency division multiplexing based communications system. Proc. 8th Int. OFDM Workshop. 2003. Р. 48-49.
5. Darwazeh I., Ghannam H. and Xu T. The First 15 Years of SEFDM: A Brief Survey. 2018 11th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP). Budapest. 2018. Р. 1-7. DOI: 10.1109/CSNDSP.2018.8471886.
6. Sliusar I., Slyusar V., Voloshko S. and Smolyar V. Next Generation Optical Access based on N-OFDM with decimation. IEEE 3nd International Scientific-Practical Conference «Problems of Info communications. Science and Technology» (PICS&T2016). October 2016. Р. 192-194.
7. Slyusar V. The non-orthogonal frequency division multiplexing (N-OFDM) signals. Part 2. Communication Technologies & Equipment Magazine. 2013. V. 6. Р. 60-65.
8. Sliusar I., Voloshko S., Smolyar V. and Slyusar V. Correction of the receiving channels fiber optic transmission systems on the basis of PDM and N-OFDM with decimation. 2017 4th International Scientific-Practical Conference Problems of Info communications. Science and Technology (PIC S&T). Kharkov. 2017. Р. 383-386. DOI: 10.1109/INFOCOMMST.2017.8246422.
9. Rapp C. Effects of HPA-nonlinearity on a 4-DPSK/OFDM signal for digital sound broadcasting system. Proc. Second Euro. Satellite Commun. Oct. 1991. Р. 179-184.
10. Vizarreta P.P., Montoro G. and Gilabert P.L. Hybrid Envelope Amplifier for envelope tracking power amplifier transmitters. 2012 42nd European Microwave Conference, Amsterdam. 2012. Р. 128-131. DOI: 10.23919/EuMC.2012.6459324.
11. Pergushev A. The Analytical Model for Calculating Distortions in the Envelope Tracking Power Supply. 2019 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech). St. Petersburg, Russia. 2019. Р. 72-75. DOI: 10.1109/EExPolytech.2019.8906813.
12. Zudov R.I. Efficiency of a Class DE Power Amplifier for RF Signals with High Peak-to-Average Power Ratio. 2019 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech). St. Petersburg, Russia. 2019. Р. 28-30. DOI: 10.1109/EExPolytech.2019.8906856.
13. Pergushev A. and Sorotsky V. Signal Distortion Decreasing in Envelope Tracking Power Amplifiers. 2018 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech). St. Petersburg. 2018. Р. 44-47. DOI: 10.1109/EExPolytech.2018.8564443.
14. Makarov S., Zavjalov S., Ovsyannikova A., Lavrenyuk I., and Xue W. Comparison of the Spectral and Energy Efficiency of FTN Signals Based on RRC Pulses and Obtained by the Optimization Method.  2019 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech). St. Petersburg, Russia. 2019. Р. 177-180. DOI: 10.1109/EExPolytech.2019.8906866.
15. Sadovaya Y. and Gelgor A. Synthesis of Signals with a Low-Level of Out-of-Band Emission and Peak-to-Average Power Ratio. 2018 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech). St. Petersburg. 2018. Р. 103-106. DOI: 10.1109/EExPolytech.2018.8564428.
16. Rashich A. and Urvantsev A. Pulse-Shaped Multicarrier Signals with Nonorthogonal Frequency Spacing. 2018 IEEE International Black Sea Conference on Communications and Networking (BlackSeaCom). Batumi. 2018. Р. 15. DOI: 10.1109/BlackSeaCom.2018.8433714.
17. Nguyen D.C., Zavjalov S.V., Ovsyannikova A.S., and Nguyen C.M. The Effectiveness of Tone Reservation Method for Peak-to-Average Power Ratio Reduction of SEFDM Signals with Optimal Envelopes. 2019 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech). St. Petersburg, Russia. 2019. Р. 165-168. DOI: 10.1109/EExPolytech.2019.8906819.
18. Antonov E.O., Rashich A.V., Fadeev D.K. and Tan N. Reduced complexity tone reservation peak-to-average power ratio reduction algorithm for SEFDM signals. 2016 39th International Conference on Telecommunications and Signal Processing (TSP). Vienna. 2016. Р. 445-448. DOI: 10.1109/TSP.2016.7760917.
19. Inamdar A.S. and Laturkar A.P. Implementation of PAPR Reduction method in OFDM with Clipping & Amplification. 2012 International Conference    on    Radar,    Communication    and    Computing     (ICRCC).    Tiruvannamalai.    2012.    Р.    289-292.     DOI: 10.1109/ICRCC.2012.6450597. Niranjan M. and Srikanth S. Adaptive active constellation extension for PAPR reduction in OFDM systems. 2011 International Conference on Recent Trends in Information Technology (ICRTIT). Chennai, Tamil Nadu. 2011. Р. 1186-1189. DOI: 10.1109/ICRTIT.2011.5972243.
20. Singh R.K. and Fidele M. An efficient PAPR reduction scheme for OFDM system using peak windowing and clipping. 2015 Third International Conference on Image Information Processing (ICIIP). Waknaghat. 2015. Р. 491-495. DOI: 10.1109/ICIIP.2015.7414822.
21. Lee G., Chia-Hsin Cheng and Ho-Lung Hung Selected mapping applied scheme for PAPR reduction in OFDM communication systems.

22. The 6th International Conference on Networked Computing and Advanced Information Management. Seoul. 2010. Р. 752-755.

23. Nguyen D.C., Zavjalov S.V. and Ovsyannikova A.S. The effectiveness of application of multi-frequency signals under conditions of amplitude limitation. In Internet of Things, Smart Spaces, and Next Generation Networks and Systems. Springer, Cham. 2019.  Р. 681-687.
24. Ryu H.G., Jin B.I. and Kim I.B. PAPR reduction using soft-clipping and ACI rejection in OFDM system. IEEE Transactions on Consumer Electronics. 2002. № 48(1). Р. 17-22.
25. Xiaodong Li and Cimini L.J. (Jr.) Effects of clipping and filtering on the performance of OFDM. IEEE Communications Letters. May 1998. Р.131-133.