Performance Evaluation of a 4 × 20-Gbps OFDM-Based FSO Link Incorporating Hybrid W-MDM Techniques

Singh, Mehtab; Chebaane, Saleh; Khalifa, Sana Ben; Grover, Amit; Dewra, Sanjeev; Angurala, Mohit

doi:10.3389/fphy.2021.746779

Cited by 30 publications

(4 citation statements)

References 40 publications

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“…Its integration into FSO transmission systems can bring numerous benefits, including increased capacity, improved flexibility, long-distance transmission capabilities, redundancy, resilience and interoperability with fiber networks [4], [7], [13]- [13]. The literature has extensively explored the application of OFDM techniques in FSO or hybrid DWDM-FSO links, focusing on aspects such as data transmission and range [14]- [15]. Among recent variants of OFDM techniques, Subcarrier Index Modulation Orthogonal Frequency Division Multiplexing (SIM-OFDM) has garnered attention for its ability to introduce additional modulation capabilities through subcarrier indexing, thereby enhancing robustness and spectral efficiency in wireless communication systems [16].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Subcarrier Index Modulation OFDM in a DWDM-FSO link

SANYA,

MAGNIDET,

BANDIRI

et al. 2024

IJPSAT

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Free Space Optics (FSO) is a wireless optical communication system using light to establish high-capacity links between points without the need for physical cables. However, its susceptibility to atmospheric conditions such as fog, rain, and turbulence presents challenges to signal quality maintenance. To address this, Dense Wavelength Division Multiplexing (DWDM), traditionally employed in fiber optics, is leveraged to optimize bandwidth utilization and scalability in high-capacity communications. The integration of DWDM into FSO systems offers redundancy and resilience against signal degradation induced by atmospheric conditions. To the best of our knowledge, this is the first time a paper explores the performance of the Subcarrier Index Modulation Orthogonal Frequency Division Multiplexing (SIM-OFDM) technique within a DWDM-FSO system. The objective is to reinforce FSO link robustness and improve transmission rates. Through a comparative analysis with conventional OFDM in an Additive White Gaussian Noise (AWGN) channel, the study reveals a notable Signal-to-Noise Ratio (SNR) gain of at least 3dB with enhanced SIM-OFDM (ESIM-OFDM). Simulations, conducted with realistic parameters within the DWDM-FSO architecture, demonstrate that ESIM-OFDM modulation enables a transmission range of 2 km with an aggregated rate of 10.1 Gb/s. These results underscore the potential of SIM-OFDM in enhancing FSO system performance through the integration of DWDM technology. The proposed ESIM-OFDM DWDM-FSO scenario could represent a highly interesting solution for establishing 5G Backhaul links.

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Section: Introductionmentioning

confidence: 99%

Performance Analysis of Subcarrier Index Modulation OFDM in a DWDM-FSO link

SANYA,

MAGNIDET,

BANDIRI

et al. 2024

IJPSAT

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“…The definition of the HG beam's spot size is different from that of the Gaussian beam which was proposed by Carter [11]. For FSOC system application, the HG beam has garnered attention due to its potential to improve the capacity using mode-division multiplexing (MDM) [12][13][14][15]. Meanwhile, the HG beam can be also used in FSOC with a single-input multiple-output (SIMO) system owing to its propagation characteristics.…”

Section: Introductionmentioning

confidence: 99%

Propagation Characteristics of Hermite–Gaussian Beam under Pointing Error in Free Space

et al. 2022

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Hermite–Gaussian (HG) beams have significant potential to improve the capacity of free-space optical communication (FSOC). The influence of pointing error on the propagation characteristics of an HG beam cannot be ignored in the FSOC system. Although the average irradiance of the HG beam under a small pointing error from the FSOC tracking mechanism has been investigated through Taylor series approximation, here, we propose that the average irradiance of the HG beam under an arbitrary magnitude pointing error can be deduced through a statistical averaging method. We firstly found that the average irradiance profile of an HG beam finally changes into an approximately Gaussian shape with the increase in pointing error and propagation distance and a larger beam waist at the transmitter could mitigate the profile change. The correlation coefficient between deduced theoretical expression and Monte Carlo simulation reaches 0.999. Additionally, the effective spot size, location of the local extreme value, average received power and signal-to-noise ratio (SNR) loss for an HG beam under pointing error were theoretically deduced and analyzed for the first time. We found that the effective spot size of the higher-order HG beam experiences less broadening under the pointing error than that of the lower-order HG beam. The fundamental theoretical expressions of average irradiance for an HG beam under pointing error have provided effective guidance for analyzing the propagation characteristics and link performance.

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“…However, this comes with a decline in spectral efficiency. To address the impediments of OOK and PPM, orthogonal frequency division multiplexing (OFDM) is attractive as a multi-carrier modulation scheme using low-speed orthogonal subcarriers [10][11][12]. Orthogonal frequency-division multiple access (OFDMA) is an OFDM-based multiple access technique in which data is sent to various users on distinct subcarriers.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of OAM-Based Advanced Symbol Modulation Schemes for OFDM Over FSO System

Ramly¹,

Amphawan²,

Neo³

2022

Proceedings of the International Conference on Computer, Information Technology and Intelligent Computing (CITIC 2022)

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Previous orthogonal frequency division multiplexing over free space optics (OFDM-FSO) systems relied on signal strength, wavelength, and polarisation to multiplex data streams in order to improve signal quality and feasible connection range. Alternatively, this work leverages on orbital angular momentum (OAM) mode division multiplexing with multiple OAM modes (OAM + 1, OAM +2, OAM +3, OAM +4) encountering different modal coupling effects under atmospheric turbulence. Advanced modulation and coding schemes (QPSK, 16QAM, and 64QAM) are deployed to improve the bit-error rate (BER), packet error rate (PER), and achieve a connection range of 1000 m in a free space optical link. OAM +1 was shown to achieve average BER and PER of 10 -3 at SNR equals to 22 dB and 30 dB respectively.

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Performance Evaluation of a 4 × 20-Gbps OFDM-Based FSO Link Incorporating Hybrid W-MDM Techniques

Cited by 30 publications

References 40 publications

Performance Analysis of Subcarrier Index Modulation OFDM in a DWDM-FSO link

Performance Analysis of Subcarrier Index Modulation OFDM in a DWDM-FSO link

Propagation Characteristics of Hermite–Gaussian Beam under Pointing Error in Free Space

Performance Analysis of OAM-Based Advanced Symbol Modulation Schemes for OFDM Over FSO System

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