Investigation on R–S Coded Coherent OFDM Free Space Optical (CO-OFDM-FSO) Communication Link Over Gamma–Gamma Channel

Miglani, Rajan; Malhotra, Jagjit Singh

doi:10.1007/s11277-019-06571-z

Cited by 17 publications

(10 citation statements)

References 36 publications

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“…16-QAM modulation technique has been used to design the 16 channel WDM-based OFDM-FSO system in this work as it delivers higher transmission rates and better spectral efficiency [30]. Along with 16-QAM modulation, the use of OFDM improves the immunity of the proposed system design against the multipath fading effects, frequency selective fading, and intersymbol interference, resulting in the increased transmission range of FSO links [38]. In addition to this, 16-QAM and OFDM are industry-graded techniques and the systems based on these techniques can be easily integrated with existing RF and optical fiber-based communication networks to further realize hybrid networks [39].…”

Section: A Transmitter Sectionmentioning

confidence: 99%

Design and Analysis of High-Speed Free Space Optical (FSO) Communication System for Supporting Fifth Generation (5G) Data Services in Diverse Geographical Locations of India

et al. 2021

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Free space optical (FSO) communication has established a reputation for itself as a next-generation network capable of delivering high-speed data services. In light of the upcoming launch of 5G services, this paper aims to evaluate the performance of the FSO system for the implementation of 5G technology in diverse geographical locations of India. The proposed 16×10 Gbps wavelength division multiplexing (WDM) based FSO link uses orthogonal frequency division multiplexing (OFDM) and digital signal processing (DSP) module to mitigate channel-induced limitations. Additionally, the proposed FSO design also employs Erbium-doped fiber amplifier (EDFA) with optimized gain characteristics. Using the data sourced from the Meteorological Department of India, the link analysis reveals that due to weak fog events in coastal areas effective link range of up to 10.75 km can be achieved while maintaining bit error rate of 10 −9 . Despite dominant foggy conditions in hilly, plains and desert areas, the proposed FSO link significantly limits the degrading effects of channel. Hence, in pursuit of futuristic smart city models, a heterogeneous combination of FSO and 5G infrastructure can conveniently cover diverse geographical locations of India to support high-speed data connectivity.

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Section: A Transmitter Sectionmentioning

confidence: 99%

Design and Analysis of High-Speed Free Space Optical (FSO) Communication System for Supporting Fifth Generation (5G) Data Services in Diverse Geographical Locations of India

et al. 2021

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“…where C t 2 represents the mean square temperature between two points within the link, T is the absolute temperature in Kelvin, and P is pressure in Pascals. The values of C n 2 ≈ 10 -15 m −2/3 symbolize a moderate turbulence regime [6]. The received signals are filtered using a Bessel filter of order four and then analyzed for quality reception using a bit error analyzer.…”

Section: System Descriptionmentioning

confidence: 99%

“…Over the last few decades, the per capita demand for data has increased manifolds, and this pattern only seems to become more and more aggressive in the near future [1][2][3]. The recent surge in popularity of free-space optical (FSO) systems as a commercial alternative to radio-frequency (RF) systems is attributed to a wide range of advantages such as 1) massive bandwidth of the order of THz, 2) adaptability with present-day radio systems as RF/FSO systems [4,5], 3) license-free spectrum, 4) negligible interference from the adjacent carriers, and 5) plug-play character which makes the FSO systems very convenient to install and relocate [6,7]. FSO systems have begun witnessing commercial and large-scale deployment in cases of disaster management, LAN connectivity within campuses, vehicle-to-vehicle communication, and backhaul services for futuristic cellular networks [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…An optical wireless system consists of a light source that could be LED or LASER for transmitting optically modulated information over the channel, while on the receiver side, a photodiode collects the photons to reproduce the original information. However, it is relevant to point out that the received signal experiences absorption and scattering due to the presence of atmospheric phenomena such as rain, fog, and haze which causes signal degradation, thus leading to loss of transmitted information [4,6]. Equally devastating is signal fading induced by the inhomogeneities present in the transmitting medium [8,11].…”

Section: Introductionmentioning

confidence: 99%

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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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“…The coded-orthogonal frequency division multiple access (OFDM) has used to address the FSO atmospheric turbulences, [32], and of course, the coded and low-level modulation has shown better BER performance, however, this method of BER performance enhancement is well known. More specifically, increasing the reliability of the communication (BER reduction) at the expense of throughput reduction (because of the coding and decreasing the modulation order) is trivial engineering solution.…”

Section: Introductionmentioning

confidence: 99%

Free space optics communication system design using iterative optimization

Lema

2023

Journal of Optical Communications

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Free Space Optics (FSO) communication provides attractive bandwidth enhancement with unlicensed bands worldwide spectrum. However, the link capacity and availability are the major concern in the different atmospheric conditions. The reliability of the link is highly dependent on weather conditions that attenuate the signal strength. Hence, this study focuses to mitigate the weather and geographic effects using iterative optimization on FSO communication. The optimization maximizes the visibility distance while guaranteeing the reliability by minimizing the Bit Error Rate (BER). The wireless optical communication system is designed for the data rate of 10 Gbps. The performance of the proposed wireless optical communication is compared against the literature in terms of visibility distance, quality factor, BER, and Eye diagram at different atmospheric conditions. The simulation results have shown that the proposed work has achieved better performance.

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Investigation on R–S Coded Coherent OFDM Free Space Optical (CO-OFDM-FSO) Communication Link Over Gamma–Gamma Channel

Cited by 17 publications

References 36 publications

Design and Analysis of High-Speed Free Space Optical (FSO) Communication System for Supporting Fifth Generation (5G) Data Services in Diverse Geographical Locations of India

Design and Analysis of High-Speed Free Space Optical (FSO) Communication System for Supporting Fifth Generation (5G) Data Services in Diverse Geographical Locations of India

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

Free space optics communication system design using iterative optimization

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