[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.3807/COPP.2021.5.2.114

On the Performance of All-optical Amplify-and-forward Relaying with a Backup Radio-frequency Link Over Strong Atmospheric Turbulence and Misalignment Fading

Altubaishi, Essam Saleh (Department of Electrical Engineering, King Saud University)

Publication Information

Current Optics and Photonics / v.5, no.2, 2021 , pp. 114-120 More about this Journal

Abstract

Free-space optical (FSO) communication is considered to be a potential solution to congestion in the radio-frequency spectrum and last-mile-access bottleneck issues in future cellular communication networks, such as 5G and beyond. However, FSO link performance may degrade significantly due to irradiance fluctuations and random temporal fluctuations from atmospheric turbulence. Therefore, in this work the main objective is to reduce the effect of the atmospheric turbulence by considering a multihop FSO communication system with amplify-and-forward relaying supported by a radio-frequency (RF) link, which form a hybrid FSO/RF communication system. The FSO link is assumed to follow the gamma-gamma fading model, which represents strong turbulence. Also, the RF link is modeled by a Rayleigh distribution. The performance of the considered system, in terms of the outage probability and average bit-error rate (BER), is investigated and analyzed under various weather conditions and pointing errors. Furthermore, the effect of the number of employed relay nodes on the performance of the system is investigated. The results indicate that the considered system reduces outage probability and average BER significantly, especially for low channel quality. Finally, the closed-form expressions derived in this work are compared to the results of Monte Carlo simulations, for verification.

Keywords

Amplify-and-forward; Atmospheric turbulence; Multihop free-space optical; Radio-frequency backup link;

Citations & Related Records

Reference

1	H. Liang, C. Gao, Y. Li, M. Miao, and X. Li, "Performance analysis of mixed MISO RF/SIMO FSO relaying systems," Opt. Commun. 478, 126344 (2021). DOI
2	Y. Zhao, W. Shi, H. Shi, W. Liu, and P. Wu, "Joint transmission slot assignment, FSO links allocation and power control for hybrid RF/FSO wireless mesh networks," Curr. Opt. Photon. 1, 325-335 (2017). DOI
3	T. Rakia, H.-C. Yang, M.-S. Alouini, and F. Gebali, "Outage analysis of practical FSO/RF hybrid system with adaptive combining," IEEE Commun. Lett. 19, 1366-1369 (2015). DOI
4	K. A. Alhamawi and E. S. Altubaishi, "Performance analysis of an AF dual-hop FSO communication system with RF backup link," Curr. Opt. Photon. 3, 311-319 (2019). DOI
5	W. Shi, K. Kang, Z. Wang, and W. Liu, "Performance analysis of hybrid SIMO-RF/FSO communication system with fixed gain AF relay," Curr. Opt. Photon. 3, 365-373 (2019). DOI
6	X. Song and J. Cheng, "Optical communication using subcarrier intensity modulation in strong atmospheric turbulence," J. Lightwave Technol. 30, 3484-3493 (2012). DOI
7	A. A. Farid and S. Hranilovic, "Outage capacity for MISO intensity-modulated free-space optical links with misalignment," J. Opt. Commun. Netw. 3, 780-789 (2011). DOI
8	G. K. Karagiannidis, T. A. Tsiftsis, and R. K. Mallik, "Bounds for multihop relayed communications in nakagami-m fading," IEEE Trans. Commun. 54, 18-22 (2006). DOI
9	The mathematical functions site, "Meijer G-function, " (Wolfram research, Published date: 29 October 2001), https://functions.wolfram.com/07.34.06.0002.01 (Accessed date: Oct. 2020).
10	A. Prudnikov, Y. Brychkov, and O. Marichev, Integrals and Series, vol. 3: More Special Functions. 2nd ed. (Gordon and Breach Science, London, UK. 1998).
11	P. V. Trinh, T. C. Thang, and A. T. Pham, "Mixed mmWave RF/FSO relaying systems over generalized fading channels with pointing errors," IEEE Photonics J. 9, 5500414 (2017).
12	X. Song, F. Yang, J. Cheng, N. Al-Dhahir, and Z. Xu, "Subcarrier phase-shift keying systems with phase errors in lognormal turbulence channels," J. Lightwave Technol. 33, 1896-1904 (2015). DOI
13	G. Yang, Z. Li, M. Bi, X. Zhou, R. Zeng, T. Wang, and J. Li, "Channel modeling and performance analysis of modulating retroreflector FSO systems under weak turbulence conditions," IEEE Photonics J. 9, 1-10 (2017).
14	L. Yang, B. Zhu, J. Cheng, and J. F. Holzman, "Free-space optical communications using on-off keying and source information transformation," J. Lightwave Technol. 4, 2601-2609 (2016).
15	P. Puri, P. Garg, and M. Aggarwal, "Analysis of spectrally efficient two-way relay assisted free space optical systems in atmospheric turbulence with path loss," Int. J. Commun. Syst. 29, 99-112 (2016). DOI
16	J. Zhang, L. Dai, Y. Zhang, and Z. Wang, "Unified performance analysis of mixed radio frequency/free-space optical dual-hop transmission systems," J. Lightwave Technol. 33, 2286-2293 (2015). DOI
17	A. M. Salhab, "A new scenario of triple-hop mixed RF/FSO/RF relay network with generalized order user scheduling and power allocation," EURASIP J. Wirel. Commun. Netw. 2016, 260 (2016). DOI
18	N. D. Chatzidiamantis, G. K. Karagiannidis, E. E. Kriezis, and M. Matthaiou, "Diversity combining in hybrid RF/FSO systems with PSK modulation," in Proc. IEEE International Conference on Communications-ICC (Kyoto, Japan, Jun. 2011), pp. 1-6.