Е-Публикации
Технически университет - София

Abstract: Constant envelope orthogonal frequency division multiplexing (CE-OFDM) has emerged as a compelling solution to the high peak-to-average power ratio (PAPR) challenge inherent in conventional OFDM, particularly suited for energy-limited scenarios such as satellite downlink communications. By leveraging phase modulation on conjugate symmetric signals, CE-OFDM significantly mitigates PAPR, leading to enhanced bit error rate (BER) performance, albeit with the trade-off of reduced spectral efficiency. To overcome this limitation, a novel scheme utilizing a relay node to apply amplitude modulation (AM) to the CE-OFDM signals, namely AM-CE-OFDM is introduced, where the satellite employs constant envelope modulation to maximize amplifier efficiency and extend communication range, while the relay's AM substantially boosts spectral efficiency. Simulation results indicate that the proposed scheme yield significant spectrum efficiency enhancement over traditional CE-OFDM systems, presenting a robust solution for next-generation satellite communication systems.

References

1. I. P. Nasarre, T. Levanen, K. Pajukoski, A. Lehti, E. Tiirola, and M. Valkama, "Enhanced Uplink Coverage for 5G NR: Frequency-Domain Spectral Shaping with Spectral Extension," IEEE Open Journal of the Communications Society, vol. 2, pp. 1188-1204, 2021.
2. S. Thota, Y. Kamatham, and C. S. Paidimarry, "Analysis of Hybrid PAPR Reduction Methods of OFDM Signal for HPA Models in Wireless Communications," IEEE Access, vol. 8, pp. 22 780-22 791, 2020.
3. M. Huang, J. Chen, and S. Feng, "Synchronization for OFDM-Based Satellite Communication System," IEEE Transactions on Vehicular Technology, vol. 70, no. 6, pp. 5693-5702, 2021.
4. S. C. Thompson, A. U. Ahmed, J. G. Proakis, J. R. Zeidler, and M. J. Geile, "Constant Envelope OFDM," IEEE transactions on communications, vol. 56, no. 8, pp. 1300-1312, 2008.
5. J. Tan, Y. Xiao, L. Dan, and W. Xiang, "Efficient LLR Approximation for Coded Constant Envelope OFDM," IEEE Transactions on Vehicular Technology, vol. 72, no. 5, pp. 6194-6208, 2023.
6. M. El Ghzaoui, A. Hmamou, J. Foshi, and J. Mestoui, "Compensation of Non-linear Distortion Effects in MIMO-OFDM Systems Using Constant Envelope OFDM for 5G Applications," Journal of Circuits, Systems and Computers, vol. 29, no. 16, p. 2050257, 2020.
7. Y. Wang, Y. Xiao, L. Dan, and H. Chen, "On the BER Performance of Constant Envelope OFDM in Frequency Selective MIMO Channels With ML Detection," IEEE Wireless Communications Letters, vol. 12, no. 8, pp. 1354-1358, 2023.
8. H. Chen, Y. Xiao, Y. Wang, L. Dan, and W. Xiang, "Constant Envelope Orthogonal Frequency Division Multiplexing With Index Modulation," IEEE Transactions on Vehicular Technology, vol. 73, no. 6, pp. 8083-8096, 2024.
9. M. De Sanctis, E. Cianca, T. Rossi, C. Sacchi, L. Mucchi, and R. Prasad, "Waveform Design Solutions for EHF Broadband Satellite Communications," IEEE Communications Magazine, vol. 53, no. 3, pp. 18-23, 2015.
10. J. Hu, J. Shi, S. Ma, and Z. Li, "Secrecy Analysis for Orthogonal Time Frequency Space Scheme Based Uplink LEO Satellite Communication," IEEE Wireless Communications Letters, vol. 10, no. 8, pp. 1623-1627, 2021.
11. X. Li, L. Tang, and X. Zhang, "Range Estimation of CE-OFDM for Radar-communication Integration," in 2018 IEEE International Conference on Communication Systems (ICCS), 2018, pp. 131-135.
12. E. R. Biehl, C. A. Mohr, B. Ravenscroft, and S. D. Blunt, "Assessment of Constant Envelope OFDM as a Class of Random FM Radar Waveforms," in 2020 IEEE Radar Conference (RadarConf20), 2020, pp. 1-6.
13. K. M. vd Zwaag, J. L. Neves, H. R. Rocha, M. E. Segatto, and J. A. Silva, "Adaptation to the LEDs Flicker Requirement in Visible Light Communication Systems through CE-OFDM Signals," Optics Communications, vol. 441, 2019.
14. M. Lu, S. Xiao, L. Zhang, L. Zheng, J. Fang, T. Huang, and W. Hu, "Real-time VLC System Integrated with Positioning Beacon Transmission Based on 2ASK-CE-OFDM Coding," Optics Communications, vol. 452, 2019.
15. A. U. Ahmed, S. C. Thompson, and J. R. Zeidler, "Channel Estimation and Equalization for CE-OFDM in Multipath Fading Channels," in MILCOM 2008-2008 IEEE Military Communications Conference. IEEE, 2008, pp. 1-7.
16. P. Yang, Y. Xiao, M. Xiao, and S. Li, "6G Wireless Communications: Vision and Potential Techniques," IEEE Network, vol. 33, no. 4, pp. 70-75, 2019.
17. W. Cao, Y. Zou, Z. Yang, and J. Zhu, "Relay Selection for Improving Physical-layer Security in Hybrid Satellite-terrestrial Relay Networks," IEEE Access, vol. 6, pp. 65 275-65 285, 2018.
18. M. Arti and V. Jain, "Relay Selection-based Hybrid Satellite-terrestrial Communication Systems," Iet Communications, vol. 11, no. 17, pp. 2566-2574, 2017.
19. B. Adnan and F. M. Alamgir, "Performance Simulation and Comparision in High Altitude Platforms (HAPs) Communications Systems under PSK, DPSK, QAM & FSK Modulation Schemes and AWGN, Rician & Rayleigh Communication Channels," in 2016 IEEE 7th Annual Information Technology, Electronics and Mobile Communication Conference (IEMCON). IEEE, 2016, pp. 1-11.

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