FSO performance analysis of a metro city in different atmospheric conditions

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Rajat Kumar Giri
Keyword(s):  
Weather Conditions ◽  
Free Space Optics ◽  
Atmospheric Conditions ◽  
Atmospheric Attenuation ◽  
Space Optics ◽  
Total Attenuation ◽  
Modulation Technique ◽  
Link Margin ◽  
Simulation Results ◽  
Margin Analysis

Abstract In this article, a free-space-optics (FSO) model for a metro city based on real-time visibility data under different weather conditions is presented. Here, the relation between atmospheric attenuation and visibility value and its impact on the FSO performance is carried out. Also, the hybrid-SIM modulation technique is applied for the bit error rate (BER) improvement of the system. Here, Bhubaneswar (the capital of Odisha, India) is considered for the above analysis. The total attenuation, BER, and link margin are calculated for the FSO performance evaluation of Bhubaneswar city and these are simulated using Matlab. The simulation results show that the proposed hybrid-SIM modulation technique achieves about 2.9 dB of SNR improvement than the existing BPSK-SIM technique. Also, from the link margin analysis, it is observed that the sunny day is the most suitable for FSO link transmission. These results can be helpful to decide the FSO parameters and the FSO setup can be designed for any city.

Improved Performance Analysis of Free Space Optics Communication Link under Rain Conditions using EDFA Pre-amplifier

2018 ◽  
Vol 39 (2) ◽  
pp. 241-246 ◽  
Author(s):  
Mehtab Singh
Keyword(s):  
Performance Analysis ◽  
Free Space ◽  
Weather Conditions ◽  
Fiber Amplifier ◽  
Free Space Optics ◽  
Communication Link ◽  
Erbium Doped Fiber Amplifier ◽  
Space Optics ◽  
Link Distance ◽  
Improved Performance

AbstractFree Space Optics (FSO) also known as Optical Wireless Communication (OWC) is a communication technology in which free space/air is used as the propagation medium and optical signals are used as the information carriers. One of the most crucial factors which degrade the performance of FSO link is the signal attenuation due to different atmospheric weather conditions such as haze, rain, storm, and fog. In this paper, an improved performance analysis of a 2.5 Gbps FSO link under rain conditions has been reported using Erbium-Doped Fiber Amplifier (EDFA) as a pre-amplifier. The results show that the maximum link distance for an FSO link under rain weather conditions with acceptable performance levels (Q$$\sim6$$and BER$$ \le {10^{- 9}})$$in the absence of EDFA pre-amplifier is 1,250 m which increases to 1,675 m with the use of EDFA pre-amplifier.

Mitigation of Atmospheric Turbulences Using Mode Division Multiplexing based on Decision Feedback Equalizer for Free Space Optics

2020 ◽  
Vol 41 (2) ◽  
pp. 185-193 ◽  
Author(s):  
Abdullah Almogahed ◽  
Angela Amphawan ◽  
Yousef Fazea
Keyword(s):  
Free Space ◽  
Minimum Mean Square Error ◽  
Decision Feedback ◽  
Free Space Optics ◽  
Decision Feedback Equalizer ◽  
Free Space Optical ◽  
Space Optics ◽  
Link Distance ◽  
Mode Division Multiplexing ◽  
Simulation Results

AbstractIn mode division multiplexing (MDM) free space optical (FSO) communication system, the atmospheric turbulences such as fog, rain, and haze cause adverse effects on system performance. This paper investigates the mitigation of atmospheric turbulences of FSO using MDM and decision feedback equalizer (DFE) with minimum mean square error (MMSE) algorithm. The implementation of the MMSE algorithm is used to optimize both the feedforward and the feedback filter coefficients of DFE. The proposed system comprises three parallel 2.5Gbit/s channels using Hermite–Gaussian modes. A data rate of 7.5Gbit/s over 40 m, 800 m, 1400 m, and 2km under medium fog, rain, haze, and clear weather, respectively, has been achieved. In addition, it is noticed that the link distance is reduced while increasing the attenuation. The simulation results revealed that a DFE improves the performance MDM FSO system while maintaining high throughput and desired low bit error rate.

Design of high speed multistream free space optics link under clear weather conditions

2020 ◽  
Vol 3 (3/4) ◽  
pp. 195
Author(s):  
Shantanu Jagdale ◽  
Brijesh Iyer ◽  
Sanjay L. Nalbalwar ◽  
Shankar B. Deosarkar
Keyword(s):  
Free Space ◽  
High Speed ◽  
Weather Conditions ◽  
Free Space Optics ◽  
Space Optics ◽  
Clear Weather

scholarly journals Fog and Atmospheric Turbulence in FSO: Models to mitigate

2019 ◽  
Vol 2 (1) ◽  
pp. 65-67 ◽  
Author(s):  
Ritu Gupta ◽  
Ankita Aggarwal
Keyword(s):  
Radio Frequency ◽  
Rate Capability ◽  
High Data Rate ◽  
Free Space Optics ◽  
Bandwidth Efficiency ◽  
Atmospheric Attenuation ◽  
High Data ◽  
Space Optics ◽  
High Bandwidth

Free space optics (FSO) is an attractive technique and provides reliability in comparison to radio frequency (RF). The FSO provides high data rate capability and has high bandwidth efficiency. The FSO provides various advantages to radio frequency and it is operable at rain also. But as other techniques FSO also has some issues like absorption, scintillation and scattering, which degrades the quality of the signal. There are various models which estimates the losses due to fog and absorption. In this paper we have analysed the kim, kruse and gamma gamma - gamma turbulence modelin terms of atmospheric attenuation or visibility

Optical Attenuation & Atmospheric Visibility of Free Space Optics

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Beenish Hafeez ◽  
Shahid Iqbal ◽  
Areeba Asif ◽  
Meera Tariq
Keyword(s):  
Dust Storm ◽  
Free Space ◽  
Paper Analysis ◽  
Dust Particles ◽  
Free Space Optics ◽  
Atmospheric Conditions ◽  
Space Optics ◽  
Optical Attenuation ◽  
Communication Links ◽  
Dust Effects

The study was conducted at University of Gujrat during 2015 with an objective to explore the effects of dust on Free Space Optics (FSO) communication. Growing pollution and dust gales motivated studies we presented in this paper. In this paper analysis of the influence of dust on free space optics communication is presented. We focused our studies on Lahore as it is polluted city of Punjab and made a comparison with dust effects in Rahimyar Khan Region. Dense dust consists of large dust particles that raise from Earths sphere and whose atmospheric intensification values are high enough to affect FSO communication links. Dust storm research is based on visibility data. In order to test visibility data, we made calculations of atmospheric conditions for different dust conditions. Visibility of wave is calculated using weather spark. As it is related with the optical attenuation, so we also calculated optical attenuation of dust particles due to influence of dust particles and compared it with that of Rahimyar Khan.

Improved Performance Investigation of 10 Gb/s–10 GHz 4-QAM Based OFDM-Ro-FSO Transmission Link

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Amit Grover ◽  
Anu Sheetal
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Free Space Optics ◽  
Frequency Division ◽  
Atmospheric Conditions ◽  
Space Optics ◽  
Link Distance ◽  
Received Power ◽  
Transmission Link ◽  
Improved Performance ◽  
Root Module

AbstractIn this work, a 10 Gb/s–10 GHz hybrid orthogonal frequency division multiplexing (OFDM)-radio-over-free space optics (Ro-FSO) transmission link using 4-level quadrature amplitude modulation (QAM) has been modeled and its performance is investigated under different atmospheric conditions and system parameters. A link distance of 4000 m at 10 Gb/s was achieved using the proposed link. Also, an improved performance by using a square root module (SRm) at the receiver end has been demonstrated. The results show a significant improvement in SNR and total received power using the proposed detection technique.

Sign in / Sign up

Export Citation Format

Share Document