Skip to main content
main-content
Top

Hint

Swipe to navigate through the articles of this issue

Published in: Photonic Network Communications 2/2020

28-08-2020 | Original Paper

Threshold optimization for modified switching scheme of hybrid FSO/RF system in the presence of strong atmospheric turbulence

Authors: Shreesh Kumar Shrivastava, Sujata Sengar, Shree Prakash Singh, Soyinka Nath

Published in: Photonic Network Communications | Issue 2/2020

Login to get access
share
SHARE

Abstract

In hybrid free space optical/radio frequency (FSO/RF) systems, switching between the optical and RF links depends on the optical and RF signal to noise ratio (SNR) threshold levels; therefore, the correct choice of these threshold levels is essential to make best use of the complementary nature of optical and RF links. Optimal selection of these threshold levels is the prime objective of this paper. A hybrid FSO/RF system using modified switching scheme with two optical and one RF threshold is considered. Here, we propose an algorithm to obtain the optimized thresholds, which yield minimum bit error rate (BER) for a given outage probability under a constraint on maximum transmitted power. The optimized thresholds are dependent on the average optical and RF SNR. Hybrid FSO/RF system use both optical as well as RF power. The average system SNR is computed by considering the actual optical and RF power consumption. Also the performance of the hybrid FSO/RF system is studied with respect to average system SNR using optimized optical and RF thresholds. This analysis reveals the existence of a critical operating point of average optical SNR, beyond which the system should be preferably operated to ensure minimum BER.
Literature
1.
go back to reference Ghassemlooy, G., Popoola, W., Rajbhandari, S.: Optical Wireless Communications: System and Channel Modelling with MATLAB, 1st edn. CRC Press, Boca Raton (2017) Ghassemlooy, G., Popoola, W., Rajbhandari, S.: Optical Wireless Communications: System and Channel Modelling with MATLAB, 1st edn. CRC Press, Boca Raton (2017)
2.
go back to reference Khalighi, M.A., Uysal, M.: Survey on free space optical communication: a communication theory perspective. IEEE Commun. Surv. Tuto. 16(4), 2231–2258 (2014) CrossRef Khalighi, M.A., Uysal, M.: Survey on free space optical communication: a communication theory perspective. IEEE Commun. Surv. Tuto. 16(4), 2231–2258 (2014) CrossRef
3.
go back to reference Abadi, M.M., Ghassemlooy, Z., Zvanovec, S., Bhatnagar, M.R., Wu, Y.: Hard switching in hybrid FSO/RF link: investigating data rate and link availability. In: IEEE ICC (Workshop 2017), pp. 463–468 (2017) Abadi, M.M., Ghassemlooy, Z., Zvanovec, S., Bhatnagar, M.R., Wu, Y.: Hard switching in hybrid FSO/RF link: investigating data rate and link availability. In: IEEE ICC (Workshop 2017), pp. 463–468 (2017)
4.
go back to reference Tapse, H., Borah, D.: Hybrid optical/RF channels characterization and performance study using low-density parity check codes. IEEE Trans. Commun. 57(11), 3288–3297 (2009) CrossRef Tapse, H., Borah, D.: Hybrid optical/RF channels characterization and performance study using low-density parity check codes. IEEE Trans. Commun. 57(11), 3288–3297 (2009) CrossRef
5.
go back to reference Rakia, T., Yang, H.C., Alouini, M.S., Gebali, F.: Outage analysis of practical FSO/RF hybrid system with adaptive combining. IEEE Commun. Lett. 19(8), 1366–1369 (2015) CrossRef Rakia, T., Yang, H.C., Alouini, M.S., Gebali, F.: Outage analysis of practical FSO/RF hybrid system with adaptive combining. IEEE Commun. Lett. 19(8), 1366–1369 (2015) CrossRef
6.
go back to reference Shrivastava, S.K., Sengar, S., Singh, S.P.: A new switching scheme for hybrid FSO/RF communication in the presence of strong atmospheric turbulence. Photon. Netw. Commun. 37(1), 53–62 (2019) CrossRef Shrivastava, S.K., Sengar, S., Singh, S.P.: A new switching scheme for hybrid FSO/RF communication in the presence of strong atmospheric turbulence. Photon. Netw. Commun. 37(1), 53–62 (2019) CrossRef
7.
go back to reference Mai, V.V., Pham, A.T.: Adaptive multi-rate designs for hybrid FSO/RF systems over fading channels. In: Globecom 2014 Workshop on Optical Wireless Communication, pp. 469–474 (2014) Mai, V.V., Pham, A.T.: Adaptive multi-rate designs for hybrid FSO/RF systems over fading channels. In: Globecom 2014 Workshop on Optical Wireless Communication, pp. 469–474 (2014)
8.
go back to reference Rakia, T., Yang, H.C., Gebali, F., Alouini, M.S.: Power adaptation based on truncated channel inversion for hybrid FSO/RF transmission with adaptive combining. IEEE Photon. J. 7(4), 1–13 (2015) CrossRef Rakia, T., Yang, H.C., Gebali, F., Alouini, M.S.: Power adaptation based on truncated channel inversion for hybrid FSO/RF transmission with adaptive combining. IEEE Photon. J. 7(4), 1–13 (2015) CrossRef
9.
go back to reference Touati, A., Abdaoui, A., Touati, F., Uysal, M., Bouallegue, A.: On the effects of combined atmospheric fading and misalignment on the hybrid FSO/RF transmission. J. Opt. Commun. Netw. 8(10), 715–725 (2016) CrossRef Touati, A., Abdaoui, A., Touati, F., Uysal, M., Bouallegue, A.: On the effects of combined atmospheric fading and misalignment on the hybrid FSO/RF transmission. J. Opt. Commun. Netw. 8(10), 715–725 (2016) CrossRef
10.
go back to reference Nath, S., Shrivastava, S.K., Sengar, S., Singh, S.P.: Novel architectures for efficient RF usage in hybrid FSO/RF system. In: IEEE International Conference on Advanced Networks and Telecommunications Systems (ANTS), pp. 1–6 (2018). Nath, S., Shrivastava, S.K., Sengar, S., Singh, S.P.: Novel architectures for efficient RF usage in hybrid FSO/RF system. In: IEEE International Conference on Advanced Networks and Telecommunications Systems (ANTS), pp. 1–6 (2018).
11.
go back to reference Bag, B., Das, A., Ansari, I.S., Prokes, A., Bose, C., Chandra, A.: Performance analysis of hybrid FSO systems using FSO/RF-FSO link adaptation. IEEE Photon. J. 10(3), 1–17 (2018) CrossRef Bag, B., Das, A., Ansari, I.S., Prokes, A., Bose, C., Chandra, A.: Performance analysis of hybrid FSO systems using FSO/RF-FSO link adaptation. IEEE Photon. J. 10(3), 1–17 (2018) CrossRef
12.
go back to reference Andrews, L.C., Phillips, R.L.: Laser Beam Propagation Through Random Media, 2nd edn. SPIE Press, Bellingham (2005) CrossRef Andrews, L.C., Phillips, R.L.: Laser Beam Propagation Through Random Media, 2nd edn. SPIE Press, Bellingham (2005) CrossRef
13.
go back to reference Kaushal, H., Jain, V.K., Kar, S.: Free Space Optical Communication, Optical Networks Series. Springer, New Delhi (2017) CrossRef Kaushal, H., Jain, V.K., Kar, S.: Free Space Optical Communication, Optical Networks Series. Springer, New Delhi (2017) CrossRef
14.
go back to reference Djordjevic, G.T., Petkovic, M.I., Spasic, M., Antic, D.S.: Outage capacity of FSO link with pointing errors and link blockage. Opt. Express 24(1), 219–230 (2016) CrossRef Djordjevic, G.T., Petkovic, M.I., Spasic, M., Antic, D.S.: Outage capacity of FSO link with pointing errors and link blockage. Opt. Express 24(1), 219–230 (2016) CrossRef
15.
go back to reference Popoola, W.O., Ghassemlooy, Z.: BPSK subcarrier intensity modulated free-space optical communications in atmospheric turbulence. J. Lightw. Technol. 27(8), 967–973 (2009) CrossRef Popoola, W.O., Ghassemlooy, Z.: BPSK subcarrier intensity modulated free-space optical communications in atmospheric turbulence. J. Lightw. Technol. 27(8), 967–973 (2009) CrossRef
Metadata
Title
Threshold optimization for modified switching scheme of hybrid FSO/RF system in the presence of strong atmospheric turbulence
Authors
Shreesh Kumar Shrivastava
Sujata Sengar
Shree Prakash Singh
Soyinka Nath
Publication date
28-08-2020
Publisher
Springer US
Published in
Photonic Network Communications / Issue 2/2020
Print ISSN: 1387-974X
Electronic ISSN: 1572-8188
DOI
https://doi.org/10.1007/s11107-020-00901-z