Performance analysis of NRZ and RZ variants for FSO communication system under different weather conditions

Sadiq, Nehall; Hussain, Akhtar; Qamar, Farhan; Shahzadi, Romana; Ali, Mudassar; Qamar, Nouman; Nadeem, Muhammad Faisal; Masud, Usman

doi:10.1515/joc-2019-0294

Cited by 5 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Next, we will obtain an exact intercept probability of the proposed OUS scheme considering the combined channel effects. Using (15), we obtain the intercept probability of the OUS scheme as…”

Section: Intercept Probability Based On Multiuser Schedulingmentioning

confidence: 99%

“…A number of research efforts on FSO-based systems are being conducted worldwide to address the aforementioned issues. For example, to evaluate the efficiency and availability of FSO links under different weather conditions, a fourchannel dense wavelength division multiplexing (DWDM) scheme is proposed in [14], while return to zero (RZ) and non-return to zero (NRZ) modulation formats are used for the single FSO link in [15]. In addition, several securing approaches have been proposed for FSO systems inspired by the recent advances in PLS in the RF counterparts, including diversity methods [16], [17], transmit aperture selection (TAS) [18], artificial noise injection [19], and chaotic waveform modulation [20].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Security-Reliability Tradeoff Analysis for Multiuser FSO Communications over a Generalized Channel

Shakir

Charafeddine²,

Hamdan

et al. 2023

IEEE Access

View full text Add to dashboard Cite

The security-reliability tradeoff (SRT) in free-space optical (FSO) communications is the most critical property to highlight, especially with respect to the development of wireless optical communications. In this paper, opportunistic scheduling selection techniques are used to improve the SRT of multiuser FSO systems under the combined influence of atmospheric turbulence with Fisher-Snedecor F distribution, generalized pointing error, and path losses due to foggy weather. Due to the broadcast nature of wireless optical propagation, the optical transmission from the transmitting users to the legitimate receiver can be easily intercepted by eavesdroppers. Therefore, an optimal user scheduling (OUS) scheme is proposed in this work to protect the legitimate wireless transmission from eavesdroppers, where a user with the highest secrecy capacity is scheduled to transmit his confidential information to the receiver. Closed-form expressions for the outage probability, interception probability, and SRT are derived for the conventional round-robin scheduling (RRS) and the proposed OUS. In addition, an asymptotic analysis for the outage probability, interception probability, and SRT is performed to provide insight into the impact of user scheduling on the system performance. We also propose the use of ''friendly jamming'' techniques, where the user with the lowest secrecy capacity is selected by the authorized receiver to jam the existing interceptor. Finally, another SRT is formulated to determine the impact of a friendly jammer on the secrecy performance of the system. The results show that the proposed OUS outperforms the RRS in terms of intercept probability and SRT performance. The obtained exact and asymptotic results are validated by Monte-Carlo simulations.

show abstract

Section: Intercept Probability Based On Multiuser Schedulingmentioning

confidence: 99%

mentioning

confidence: 99%

Security-Reliability Tradeoff Analysis for Multiuser FSO Communications over a Generalized Channel

Shakir

Charafeddine²,

Hamdan

et al. 2023

IEEE Access

View full text Add to dashboard Cite

show abstract

A comprehensive survey of free-space optical communication – modulation schemes, advantages, challenges and mitigations

Bibi,

Baig,

Qamar

et al. 2023

Journal of Optical Communications

View full text Add to dashboard Cite

The demand for large bandwidth and high data rates in communication systems has become the main cause of the upgrade of traditional networks into free space optical (FSO) technology. FSO technology has gained significant popularity due to its easy deployment, high data rates, abundant bandwidth, enhanced security, and license-free spectrum utilization. However, the performance of FSO communication systems can be affected by certain limiting factors, such as changes in weather conditions during data transmission. To overcome these challenges and improve FSO performance, various modulation techniques are employed. This article presents a concise overview of the FSO communication system, highlighting different modulation techniques used to enhance its performance, as well as discussing its advantages, applications, and existing challenges. Some advanced modulation formats which are recently introduced in the field of FSO communication such as QPSK, DP-QPSK, QAM, and OFDM are also made part of this paper.

show abstract

Performance comparison of Duobinary, AMI, CNRZ and CSRZ for next generation FSO communication system

Ejaz,

Shafqat,

Qureshi

et al. 2024

Journal of Optical Communications

View full text Add to dashboard Cite

FSO, known as free-space optics, is a competent technology in wireless communication for providing license free spectrum, bandwidth, and high efficiency in next-generation networks. In this paper, an experimental approach is used to deploy FSO channel communication using different intensity modulation schemes such as CSRZ, chirped NRZ, duobinary and AMI. The performance of FSO link is adversely affected by weather conditions like haze, rain, and fog. By using different techniques, it is possible to overcome the effect of atmospheric turbulences. Therefore, four different modulation formats are compared and analyzed by testing different parameters like laser power, range, attenuation, and data rates. Quality of received signal is judged by taking Q-factor, bit error rate (BER), and eye-diagrams. An operating wavelength of 850 nm has been used to simulate the system designs. This paper aims to conclude the best intensity modulation scheme for its use in next generation networks such as 5G where direct deployment of optical fiber is not possible or feasible.

show abstract

Performance analysis of NRZ and RZ variants for FSO communication system under different weather conditions

Cited by 5 publications

References 16 publications

Security-Reliability Tradeoff Analysis for Multiuser FSO Communications over a Generalized Channel

Security-Reliability Tradeoff Analysis for Multiuser FSO Communications over a Generalized Channel

A comprehensive survey of free-space optical communication – modulation schemes, advantages, challenges and mitigations

Performance comparison of Duobinary, AMI, CNRZ and CSRZ for next generation FSO communication system

Contact Info

Product

Resources

About