Performance Comparison of Free-Space Optical (FSO) Communication Link Under OOK, BPSK, DPSK, QPSK and 8-PSK Modulation Formats in the Presence of Strong Atmospheric Turbulence

Choyon, A. K. M. Sharoar Jahan; Chowdhury, Ruhin

doi:10.1515/joc-2019-0250

Cited by 19 publications

(7 citation statements)

References 15 publications

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“…where λ is the wavelength, L is the propagation distance, and H is the loss coefficient. Kim's attenuation model for FSO links to relate attenuation with visibility and operational wavelength is as follows [34,42]: where V refers to meteorological visibility, λ is the operating wavelength, and q is the factor that depends on the size distribution of atmospheric particles. When it comes to attenuation that occurs due to rain, the equation based on the rate of rainfall can be given as follows [40]:…”

Section: Link Design Analyticsmentioning

confidence: 99%

Developing Cost-Effective and High-Speed 40 Gbps FSO Systems Incorporating Wavelength and Spatial Diversity Techniques

et al. 2021

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Free-space optical (FSO) communication systems are being anticipated to offer promising alternatives to existing radio networks in delivering high-speed data access to end-users. Ease of installation, robust features, and cost-effective operation have been the hallmark of FSO systems, and these features will play an obvious role in deciding the ways in which futuristic smart communication models will operate. Despite these arrays of features, FSO links suffer severe performance degradation due to channel-induced impairments caused by atmospheric effects such as rain, haze, and fog. In this work, we have investigated and compared the performance of 40 Gbps FSO links for different channel conditions ranging from clear weather to severe attenuation by incorporating spatial and wavelength diversity as performance booster techniques. The use of an erbium-doped fiber amplifier (EDFA) with FSO links has also been proposed here. Using performance metrics like bit error rate (BER) and eye patterns, it has been found that the use of EDFA not only helps in compensating for the link losses but also aids in realizing an all-optical processing based last-mile access system. The proposed FSO system will be capable of bridging the existing backbone fiber networks with end-users with minimal changes to the existing hardware regime, thereby proving to be extremely cost-effective in sharp contrast to radio-frequency generations which require major infrastructure overhaul.

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Section: Link Design Analyticsmentioning

confidence: 99%

Developing Cost-Effective and High-Speed 40 Gbps FSO Systems Incorporating Wavelength and Spatial Diversity Techniques

et al. 2021

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“…Where, 𝛿 2 represents the Rytov Variance and it is defined by, 𝛿 2 = 1.23𝐶 2 𝑛 𝑘 7/6 𝐷 11/6 Here, k=2𝜋/𝜆 represents the Optical wave number, 𝜆 is wavelength, D=link distance. Moreover, 𝐶 𝑛 2 changes from 10 −13 𝑚 −2/3 for strong turbulent conditions to 10 −17 𝑚 −2/3 for weak turbulent conditions [31]. Refractive index structure parameter 𝐶 𝑛 2 determines the turbulence strength and it clearly depends on the geographical location, altitude, time and wind speed.…”

Section: Atmospheric Turbulent Channelmentioning

confidence: 99%

Design of Novel Hybrid CPDM-CO-OFDM FSO Communication System and its Performance Analysis under Diverse Weather Conditions

Chowdhury,

Choyon

2021

Preprint

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A comprehensive novel design is proposed for the free-space optical (FSO) communication system by hybridizing circular polarization division multiplexing (CPDM) with coherent optical orthogonal frequency division multiplexing (CO-OFDM) and its performance is investigated realistically under diverse turbulent weather conditions of Bangladesh. Here we consider Gamma-Gamma (G-G) distribution for the turbulent FSO channel model. Moreover, the proposed scheme presents an excellent performance since CPDM technique not only maximizes the link capacity of FSO system but also enhances the spectral efficiency (SE) of the system. Besides, multipath-fading, which is appeared during the FSO transmission, is significantly mitigated by OFDM modulation. The outcomes from simulation confirm the advantages of the proposed hybrid scheme and also it can serve as a reference for the FSO application even in the turbulent weather conditions. Performance analysis of the proposed model is described in terms of optical power spectrum (OPS), optical signal to noise ratio (OSNR), bit error rate (BER), Q factor, constellation diagrams, and eye diagrams.

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“…In such a case, we can cite the works [32][33][34] that have examined the performance of FSO links using high order modulation schemes depending on complex atmospheric conditions. The results obtained by these research articles clearly show that by using high-level modulation schemes, we can achieve a reliable high-speed and efficient spectral transmission of information for FSO links under complex atmospheric conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Spectral efficient modulation schemes, such as M‐ary quadrature amplitude modulation (QAM) and M‐ary phase shift keying (PSK), are the most common higher‐order modulation schemes based on coherent detection for future wireless networks. In such a case, we can cite the works 32‐34 that have examined the performance of FSO links using high order modulation schemes depending on complex atmospheric conditions. The results obtained by these research articles clearly show that by using high‐level modulation schemes, we can achieve a reliable high‐speed and efficient spectral transmission of information for FSO links under complex atmospheric conditions.…”

Section: Introductionmentioning

confidence: 99%

Image transmission performance analysis through free space optical communication link using coherent QPSK modulation under various environmental conditions

Djir

Meskine

Tayebi

2023

Trans Emerging Tel Tech

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Free space optics (FSO) technology has been used recently in many applications due to its various advantages such as high bandwidth, easy deployment, high security, free installation license and immunity to electromagnetic interference. However, this type of communication is vulnerable to meteorological conditions such as rain, haze and fog which significantly degrade the system's efficiency. To enhance the effectiveness of the FSO systems, Quadrature Phase Shift Keying (QPSK) modulation based on coherent detection constitutes a promising technique for achieving high spectral efficiency and long‐distance FSO links with the characteristics of low‐cost implementation and simple design. This work aims to investigate the performance of FSO communication links on image transmission under the presence of atmospheric attenuations. A comparative study has been made using QPSK modulation scheme and on–off‐keying (OOK) modulation scheme to estimate the maximum range that was used to recover an RGB transmitted image over an FSO link under different meteorological weathers. The obtained results clearly show that the quality of the received image has degraded significantly during transmission through free space yielding to limit the propagation range. Moreover, the proposed FSO communication system performs well when using QPSK modulation rather than OOK modulation in different environmental conditions. Thus, to improve the quality of the received image under adverse fog weather condition, high power and small beam divergence angle have been suggested to increase system's performance. The proposed solution increases the communication range of the FSO link by 230 m and 100 m for moderate and heavy fog, respectively.

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Performance Comparison of Free-Space Optical (FSO) Communication Link Under OOK, BPSK, DPSK, QPSK and 8-PSK Modulation Formats in the Presence of Strong Atmospheric Turbulence

Cited by 19 publications

References 15 publications

Developing Cost-Effective and High-Speed 40 Gbps FSO Systems Incorporating Wavelength and Spatial Diversity Techniques

Developing Cost-Effective and High-Speed 40 Gbps FSO Systems Incorporating Wavelength and Spatial Diversity Techniques

Design of Novel Hybrid CPDM-CO-OFDM FSO Communication System and its Performance Analysis under Diverse Weather Conditions

Image transmission performance analysis through free space optical communication link using coherent QPSK modulation under various environmental conditions

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