Performance of Spatial Diversity DCO-OFDM in a Weak Turbulence Underwater Visible Light Communication Channel

Jiang, Hongyan; Qiu, Hongbing; He, Ning; Popoola, Wasiu O.; Ahmad, Zahir; Rajbhandari, Sujan

doi:10.1109/jlt.2019.2963752

Cited by 37 publications

(18 citation statements)

References 31 publications

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“…The fading coefficient of the transmitter-receiver link is given by h m , which represents the channel between the emitting LD and the mth SN. In this work, we consider that the probability density function (PDF) of h m follows the lognormal distribution with mean µ m and variance σ 2 m , and it is given by [28]…”

Section: B Turbulence Channel Modelmentioning

confidence: 99%

Non-Orthogonal Multiple Access-Based Underwater VLC Systems in the Presence of Turbulence

Bariah

Elamassie²,

Muhaidat

et al. 2022

IEEE Photonics J.

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The promising potential of underwater applications in visible light communication (VLC) systems has recently gained considerable research attention, as an efficient technology for enabling high data rate, massive connectivity, and ultra-low latency. Different from indoor VLC, underwater wireless communications experience harsh environmental challenges, yielding a degraded performance. Non-orthogonal multiple access (NOMA) was introduced to enhance spectral efficiency and connectivity of underwater VLC communications. In this paper, we develop a mathematical framework to evaluate the performance of NOMAenabled underwater VLC systems in the presence of turbulence. Specifically, we derive a closed-form expression for the outage probability of NOMA over lognormal channels, while considering the effect of path loss and turbulence. The derived analytical results with the corresponding numerical results demonstrate that the transmission distance between laser diode and sensor nodes (SNs) has a high impact on the outage performance of the SNs, due to the increased turbulence level with increased distance. Moreover, the presented results show the effect of the water type on the outage performance of the SNs and on the optimum values of the power coefficients.Index terms-Non-orthogonal multiple access (NOMA), underwater, outage probability, visible light communication (VLC), turbulence, path loss. I. INTRODUCTIONFew decades ago, the potential of underwater wireless communications (UWC) was confined to the military field, due to its inherent security feature. However, recently, UWC has become an active research area with broad civilian and commercial applications, such as underwater archaeology, gas and natural minerals exploration, navigation, and disaster precaution [1]. This is motivated by the notable advantages of UWC, which include reliability, cost efficiency, flexibility, and high data rate communications. In unguided water environment, UWC is conventionally realized by radio frequency (RF) Manuscript

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Section: B Turbulence Channel Modelmentioning

confidence: 99%

Non-Orthogonal Multiple Access-Based Underwater VLC Systems in the Presence of Turbulence

Bariah

Elamassie²,

Muhaidat

et al. 2022

IEEE Photonics J.

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“…Optical-intensity fluctuation due to UOT was characterised by multiplicative fading coefficient

[ 3 ].…”

Section: Cap-based Uvlc Systemmentioning

confidence: 99%

“…However, the performance of a UVLC system is adversely affected by absorption, scattering, and underwater optical turbulence (UOT). Hence, to realise the full potential of UVLC, appropriate technique(s) should be adopted to alleviate these impairments [3]. Among these impairments, absorption and scattering were extensively studied [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…UOT results from changes in the refractive index of water caused by random variations of water temperature and salinity, and the presence of air bubbles that result in random fluctuations on the received signal known as turbulence-induced fading. The performance of underwater optical wireless communication systems in the presence of underwater turbulence is often modelled with the log-normal distribution [2,3,7,8]. This is similar to the model used for weak atmospheric turbulence [9].…”

Section: Introductionmentioning

confidence: 99%

“…To mitigate the effects of turbulence-induced fading, several techniques, such as forward-error correction (FEC) [ 13 ], diversity [ 2 , 3 , 8 ], and multihop relaying [ 7 ], were suggested. For short-range communication, coding and diversity are preferred due to low complexity and ease of implementation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

LDPC-Coded CAP with Spatial Diversity for UVLC Systems over Generalized-Gamma Fading Channel

Jiang

Qiu

et al. 2020

Sensors

Self Cite

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In this paper, low-density parity-check (LDPC)-coded carrierless amplitude and phase (CAP) modulation with spatial diversity is proposed to mitigate turbulence-induced fading in an underwater visible-light communication (UVLC) channel. Generalized-gamma (GG) distribution was used to model the fading, as this model is valid for weak- and strong-turbulence regimes. On the basis of the characteristic function (CHF) of GG random variables, we derived an approximated bit-error rate (BER) for the CAP modulation scheme with spatial diversity and equal-gain combining (EGC). Furthermore, we simulated the performance of the CAP system with diversity and LDPC for various turbulence conditions and validated the analysis. Obtained results showed that the combination of LDPC and spatial diversity is effective in mitigating turbulence-induced fading, especially when turbulence strength is strong.

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On the Performance of MIMO-UVLC System over Turbulence-induced Fading Channels

Mumtaz

Aziz

Masroor

2022

International Conference on Artificial Intelligence for Smart Community

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Performance of Spatial Diversity DCO-OFDM in a Weak Turbulence Underwater Visible Light Communication Channel

Cited by 37 publications

References 31 publications

Non-Orthogonal Multiple Access-Based Underwater VLC Systems in the Presence of Turbulence

Non-Orthogonal Multiple Access-Based Underwater VLC Systems in the Presence of Turbulence

LDPC-Coded CAP with Spatial Diversity for UVLC Systems over Generalized-Gamma Fading Channel

On the Performance of MIMO-UVLC System over Turbulence-induced Fading Channels

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