Relay-assisted optical wireless communications in turbid water

Palitharathna, Kapila W. S.; Godaliyadda, G. M. R. I.; Herath, Vijitha; Suraweera, Himal A.

doi:10.1145/3291940.3291984

Cited by 8 publications

(2 citation statements)

References 16 publications

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“…Wireless optical communication (WOC) is a form of optical communication in which unguided visible, infrared (IR), or ultraviolet (UV) light is used to carry signals and is considered a viable solution for achieving high-speed and large-capacity communication links [1][2][3][4]. It plays an irreplaceable role and has broad application prospects in confidentiality [5]; [6], cellular connectivity support, and underwater communication [7]; [8]; [9]. However, owing to the fact that light travels in a straight line-light path [10], the alignment and time-varying fading channels bring a considerable burden to the system.…”

Section: Introductionmentioning

confidence: 99%

Brain inspired optoelectronic integrated receiver chip for wireless optical communication

Xie

Zhao²,

Wang³

et al. 2022

Front. Phys.

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Inspired by the mechanism of visual attentional selection, a wireless optical communication (WOC) Integrated receiver consisting of a vertical double junction photodetector (VDJ-PD) and an attentional selection circuit (ASC) is presented. The whole receiver is fabricated in standard CMOS technology. The VDJ-PD can realize optical signal detection and wavelength identification. The attentional selection circuit activates the competition among the two PN junctions in VDJ-PD to select the signal with significant feature in real-time while discarding non-significant signals. A higher-order signal modulation scheme is applied by the proposed receiver to obtain a high transfer rate, and all data are decoded using color features. The optical testing results show that parallel and real-time communication of the red and blue light can be achieved, and the rise time is 4.47 μs. To measure the anti-interference performance of the receiver, a water tank is used to simulate a harsh communication environment. Results indicate that the real-time and reliable communication requirements in a harsh channel condition are satisfied. When the percentage ratio between the intensity of stray light relative to the light with maximum intensity is 84%, an accurate information decoding can still be achieved. Moreover, the whole processing procedure does not require the participation of ADC, CPU and memory, consequently avoiding the von Neumann bottleneck.

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Section: Introductionmentioning

confidence: 99%

Brain inspired optoelectronic integrated receiver chip for wireless optical communication

Xie

Zhao²,

Wang³

et al. 2022

Front. Phys.

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“…In [9], it was shown that attenuation and blocking effects due to suspended particles degrade the performance of relay-based UOWC systems. In [10], a parallel amplifyand-forward relay system has been designed to mitigate the performance loss due to suspended particles.…”

Section: Introductionmentioning

confidence: 99%

Average Rate Analysis of Cooperative NOMA Aided Underwater Optical Wireless Systems

Palitharathna

Suraweera

Godaliyadda

et al. 2021

IEEE Open J. Commun. Soc.

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In this paper, we consider a cooperative non-orthogonal multiple access (NOMA) aided underwater optical wireless system in which the source transmits to two users where the near user serves as a relay node to the far user. Our proposed system consists of multiple narrow-angle light-emitting diode (LED)/photodiode (PD) elements at the source, near user, and far user. In order to achieve communication, our system selects a single LED/PD at each node. We propose several low complexity LED/PD selection schemes that aim to maximize the link throughput and in addition consider optimal and random LED/PD selection for benchmarking. In order to characterize the performance of each scheme, bounds and closed-form tight approximations on the average achievable sum rates are presented. The use of multi element nodes and NOMA increase the average sum rate significantly over conventional orthogonal access. Moreover, near-optimal throughput can be achieved using channel gain based and line-of-sight based LED/PD selection schemes in the medium-to-high transmit power regimes. The derived expressions are also useful to investigate the impact of key system and channel parameters such as the source transmit power, power allocation factor, node placement, and the number of elements at each node.

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Impact of Receiver Orientation on Full-Duplex Relay Aided NOMA Underwater Optical Wireless Systems

Palitharathna

Suraweera

Godaliyadda

et al. 2020

ICC 2020 - 2020 IEEE International Conference on Communications (ICC)

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Relay-assisted optical wireless communications in turbid water

Cited by 8 publications

References 16 publications

Brain inspired optoelectronic integrated receiver chip for wireless optical communication

Brain inspired optoelectronic integrated receiver chip for wireless optical communication

Average Rate Analysis of Cooperative NOMA Aided Underwater Optical Wireless Systems

Impact of Receiver Orientation on Full-Duplex Relay Aided NOMA Underwater Optical Wireless Systems

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