Performance comparison of M-QAM and DQPSK modulation schemes in a 2 × 20 Gbit/s–40 GHz hybrid MDM–OFDM-based radio over FSO transmission system

Singh, Mehtab; Malhotra, Jyoteesh

doi:10.1007/s11107-019-00861-z

Cited by 36 publications

(10 citation statements)

References 24 publications

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“…Compared to the hybrid OOK/M-ary DPPM, the M-n-PAPM requires 0.3 dB more power. The results demonstrate that the proposed hybrid OOK/M-DPPM and M-n-PAPM models for the WDM-FSO systems can be improved [54][55][56][57][58][59][60]. Table 2 summarizes the proposed modulation schemes of MPPM, M-ary-PAPM, and hybrid M-ary PAPM-MPPM with hybrid k-level n-pulse where k n (with k ∈ {1, 2, …}) [2,8,9,17,42,50].…”

Section: Resultsmentioning

confidence: 98%

Performance Enhancement of DWDM-FSO Optical Fiber Communication Systems Based on Hybrid Modulation Techniques under Atmospheric Turbulence Channel

2021

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In this paper, we enhance the performance efficiency of the free-space optical (FSO) communication link using the hybrid on-off keying (OOK) modulation, M-ary digital pulse position modulation (M-ary DPPM), and M-pulse amplitude and position modulation (M-PAPM). This work analyzes and enhances the bit error rate (BER) performance of the moment generating function, modified Chernoff bound, and Gaussian approximation techniques. In the existence of both an amplified spontaneous emission (ASE) noise, atmospheric turbulence (AT) channels, and interchannel crosstalk (ICC), we propose a system model of the passive optical network (PON) wavelength division multiplexing (WDM) technique for a dense WDM (DWDM) based on the hybrid fiber FSO (HFFSO) link. We use eight wavelength channels that have been transmitted at a data rate of 2.5 Gbps over a turbulent HFFSO-DWDM system and PON-FSO optical fiber start from 1550 nm channel spacing in the C-band of 100 GHz. The results demonstrate (2.5 Gbps × 8 channels) 20 Gbit/s-4000 m transmission with favorable performance. In this design, M-ary DPPM-M-PAPM modulation is used to provide extra information bits to increase performance. We also propose to incorporate adaptive optics to mitigate the AT effect and improve the modulation efficiency. We investigate the impact of the turbulence effect on the proposed system performance based on OOK-M ary- PAPM-DPPM modulation as a function of M-ary DPPM-PAPM and other atmospheric parameters. The proposed M-ary hybrid DPPM-M-PAPM solution increases the receiver sensitivity compared to OOK, improves the reliability and achieves a lower power penalty of 0.2–3.0 dB at low coding level (M) 2 in the WDM-FSO systems for the weak turbulence. The OOK/M-ary hybrid DPPM-M-PAPM provides an optical signal-to-noise ratio of about 4–8 dB of the DWDM-HFFSO link for the strong turbulence at a target BER of 10−12. The numerical results indicate that the proposed design can be enhanced with the hybrid OOK/M-DPPM and M-PAPM for DWDM-HFFSO systems. The calculation results show that PAPM-DPPM has increased about 10–11 dB at BER of 10−12 more than the OOK-NRZ approach. The simulation results show that the proposed hybrid optical modulation technique can be used in the DWDM-FSO hybrid links for optical-wireless and fiber-optic communication systems, significantly increasing their efficiency. Finally, the use of the hybrid OOK/M-ary DPPM-M-PAPM modulation schemes is a new technique to reduce the AT, ICC, ASE noise for the DWDM-FSO optical fiber communication systems.

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Section: Resultsmentioning

confidence: 98%

Performance Enhancement of DWDM-FSO Optical Fiber Communication Systems Based on Hybrid Modulation Techniques under Atmospheric Turbulence Channel

2021

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“…The 10 Gb/s, 16‐QAM‐OFDM Tx signal with a total modulated bandwidth of 2.5 GHz at the 7.5 GHz RF carrier is therefore generated as indicated by the RF spectrum in the inset (i). It is worth mentioning that, transmission of the 16‐QAM‐OFDM signal was also investigated recently in a simulated 40 GHz RoFSO link, but using the coherent detection‐based Rx which is complex and costly [22]. As shown in Fig.…”

Section: 28 Ghz Rofso System Using Mzi‐dc Rxmentioning

confidence: 99%

Turbulence mitigation in a 28 GHz radio‐over‐free‐space optics link using an integrated Mach–Zehnder interferometer and a diversity combining receiver

et al. 2020

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We propose an integrated Mach-Zehnder interferometer and diversity combining receiver (MZI-DC Rx) to mitigate the atmospheric turbulence-induced fading in millimetre-wave (MMW) radio-over-free-space optics (RoFSO) links. We have used a carrier frequency of 28 GHz as recommended for the fifth-generation wireless access networks and considered two optical MMW signal generation schemes namely double-and single-sidebands. In direct detection (DD)based RoFSO, the link performance is limited by atmospheric turbulence. We show that, the proposed Rx can overcome this detrimental effect. It is verified by investigating the transmission of a 10 Gb/s 16-quadrature amplitude modulation signal at 28 GHz over a 1 km FSO channel under weak and strong turbulence regimes. For DSB-based MMW, the proposed Rx offers improved error vector magnitudes of about 0.8% and 5.7% and modulation error ratios of 1.3 and 4.9 dB under weak and strong turbulence regimes, respectively compared with the DD Rx. For the SSB scenario under weak turbulence, the proposed Rx achieves 4 dB improvement in receiver sensitivity and four orders of magnitude enhancement in the bit error rate over the DD Rx. The proposed Rx can be integrated on a single chip for further cost reduction.

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“…Recently, OFDM-based radio over free-space optics have proposed and they have shown attractive linkdistance enhancement on different atmospheric conditions, [26,27]. However, both multiplexing to enhance the data rate and using low order modulation to enhance the reliability have the drawbacks of higher processing time and lower data rate, respectively, for future communications, 5G.…”

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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Performance comparison of M-QAM and DQPSK modulation schemes in a 2 × 20 Gbit/s–40 GHz hybrid MDM–OFDM-based radio over FSO transmission system

Cited by 36 publications

References 24 publications

Performance Enhancement of DWDM-FSO Optical Fiber Communication Systems Based on Hybrid Modulation Techniques under Atmospheric Turbulence Channel

Performance Enhancement of DWDM-FSO Optical Fiber Communication Systems Based on Hybrid Modulation Techniques under Atmospheric Turbulence Channel

Turbulence mitigation in a 28 GHz radio‐over‐free‐space optics link using an integrated Mach–Zehnder interferometer and a diversity combining receiver

Free space optics communication system design using iterative optimization

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