Performance enhancement of double hard limited 2D atmospheric OCDMA system using aperture averaging and spatial diversity

Yadav, Ajay; Kar, Subrat; Jain, Virander Kumar

doi:10.1049/iet-com.2018.5787

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…This degrades the performance of the system. The interference pdf with MAI for an N user OCDMA system is given as [15]…”

Section: Performance Evaluation Of Ocfhc/qcc Based Ocdma Systemmentioning

confidence: 99%

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Comparative Analysis of OCFHC/QCC and ZCC Based OCDMA System in Underwater Channel

Yadav

Kumar²,

Mukherjee

et al. 2022

Preprint

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In this work, the performance of one coincidence frequency hopping code/quadratic congruence code (OCFHC /QCC) based optical code division multiple access (OCDMA) system is compared to zero cross-correlation (ZCC) based OCDMA system in the underwater channel. The influence of beam divergence, turbulence, and attenuation is considered while evaluation of the performance in underwater channel. The different water types which have been used for the analysis are pure sea, clear ocean, and coastal water. In the analysis, it has been evaluated and observed that the performance of OCFHC/QCC based OCDMA system is superior to ZCC based OCDMA system under certain conditions. It is also perceived that when multiple access interference (MAI) dominates in OCFHC/QCC based systems then ZCC performs comparatively better than OCFHC/QCC based OCDMA system. For OCFHC/QCC seven user system, P_E=10^{-9} is achieved with P_T=6 and 16 dBm in pure sea and clear ocean, respectively. Correspondingly, P_E=10^{-9} is possible with ZCC code when P_T=5 and 15 dBm in the same water types. In the coastal water, the performance of both codes is not good.

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“…This degrades the performance of the system. The interference pdf with MAI for an N user OCDMA system is given as [15]…”

Section: Performance Evaluation Of Ocfhc/qcc Based Ocdma Systemmentioning

confidence: 99%

“…Researchers have modeled the underwater channel to study and mitigate these losses [12,13]. Further, the performance is analysed and enhanced by using various performance enhancement techniques like time and spatial diversity, forward error correction, and aperture averaging [14,15].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of OCFHC/QCC and ZCC Based OCDMA System in Underwater Channel

Yadav

Kumar²,

Mukherjee

et al. 2022

Preprint

Self Cite

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“…because of its high diversity gain, which can effectively counter the effects of multipath fading and is accessible to implement [8]. Aperture averaging and spatial diversity techniques are used to improve the error probability of atmospheric system [9], [10]. Analysis results show that spatial diversity can improve performance in presence of turbulence and different weather conditions [11].…”

Section: Introductionmentioning

confidence: 99%

10Gb/s Two-User Spatial Diversity FSO-CDMA Wiretap Channel Based on Reconfigurable Optical Encoder/Decoders

Zheng

Peng

et al. 2020

IEEE Access

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Due to the effect of atmospheric turbulence, the transmission reliability and physical-layer security of free space optical (FSO) communication system are facing many challenges. In this paper, for the first time, we design and investigate a 10 Gb/s reconfigurable FSO wiretap channel based on spatial diversity and optical code division multiple access (OCDMA). Reconfigurable two-dimensional optical encoder and decoder are constructed by wavelength selective switch and optical delay lines, and reconfigurable onedimensional optical encoder and decoder are constructed by couplers and tunable optical delay lines. Under three different turbulence conditions, bit error rates (BER) of legitimate user and eavesdropper are measured. It can be seen that under turbulence effects, BER of legitimate user in spatial-diversity is lower than that of non-diversity system. By the rapid code reconfiguration of legitimate users, the eavesdropper can only use unmatched decoder. Thus, the eavesdropping methods of code interception and brute-force searching can be avoided. Experimental results show that this scheme can ensure the reliable transmission of legitimate users, and the eavesdropper can't crack the information when the extraction ratio is 1%. Hence, reliability and physical-layer security can be enhanced simultaneously.INDEX TERMS Free space optical communication, optical code division multiple access, spatial diversity, atmospheric turbulence.

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Performance Analysis of Underwater 2D OCDMA System

Yadav

Kumar²

2020

Lecture Notes in Electrical Engineering

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Performance enhancement of double hard limited 2D atmospheric OCDMA system using aperture averaging and spatial diversity

Cited by 5 publications

References 21 publications

Comparative Analysis of OCFHC/QCC and ZCC Based OCDMA System in Underwater Channel

Comparative Analysis of OCFHC/QCC and ZCC Based OCDMA System in Underwater Channel

10Gb/s Two-User Spatial Diversity FSO-CDMA Wiretap Channel Based on Reconfigurable Optical Encoder/Decoders

Performance Analysis of Underwater 2D OCDMA System

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