Average BER performance of rectangular QAM-UWOC over strong oceanic turbulence channels with pointing error

Fu, Yuqing; Qi, Dawei; Huang, Chengti; Du, Yongzhao; Zhou, Lin

doi:10.1016/j.optcom.2020.126362

Cited by 19 publications

(3 citation statements)

References 22 publications

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“…Thus are relatively small in turbulence with large  . Contrary to the negative effects of turbulence, the aperture smoothing effect brought by large beam width can mitigate beam wander at the receiver [30]. Since the turbulence perturbation and beam width are both larger when  reduces, c r decreases if the spreading of beam width makes the aperture smoothing effect more dominant increase with the propagation distance z .…”

Section: Resultsmentioning

confidence: 99%

Effects of Anisotropic Turbulent Ocean on Propagation of Asymmetric Bessel-Gaussian Beam

Yu,

Zhang,

Zhang

et al. 2024

IEEE Photonics J.

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Aiming at the propagation of asymmetric vortex beam, we investigate the spreading and wander characteristics of asymmetric Bessel-Gaussian beam in oceanic turbulence. Based on the cross-spectral density and Wigner distribution function of beam field, the theoretical expressions of spreading factor and beam center displacement are established to evaluate spreading and wander. The anisotropic turbulent condition is adopted to analyze turbulence impacts with more generality. The turbulence dominated by salinity fluctuation with lower anisotropy, larger temperature dissipation and smaller kinetic energy dissipation induces more beam spreading and wander. As for asymmetric Bessel-Gaussian beam, the increment of asymmetry can improve beam directionality. Besides, smaller beam scale but larger Gaussian waist radius, vortex order and beam wavelength also mitigate spreading and wander. The investigations are instructive for the underwater applications of asymmetric vortex beams.

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Section: Resultsmentioning

confidence: 99%

Effects of Anisotropic Turbulent Ocean on Propagation of Asymmetric Bessel-Gaussian Beam

Yu,

Zhang,

Zhang

et al. 2024

IEEE Photonics J.

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“…This noise has been modeled as Gaussian distribution with mean zero and variance σ 2 = (4K B T e B e )/R L , where K B = 1.38 × 10 −23 J /K is Boltzmann constant, T e = 256 K is absolute receiver temperature, B e = 2/T b is electronic bandwidth and R L = 100 Ω is load resistance [17], [31]. The channel model considered in (1) is a combination of turbulence and pointing errors, and the overall channel fading coefficient can be represented [19], [30] as…”

Section: System Modelmentioning

confidence: 99%

Performance of Spatially Coupled LDPC Codes Over the Underwater Wireless Optical Channel With Strong Turbulence and Pointing Errors

Padala,

D’souza

2024

IEEE Access

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The major problems in an underwater wireless optical communication (UWOC) link are turbulence induced fading and pointing errors. In this paper, we have investigated the bit error rate (BER) performance of spatially coupled low-density parity-check (SC-LDPC) coded horizontal UWOC link over a strong turbulent channel model with pointing errors. The performance of this link for different channel and code parameters has been studied using simulations. It has been observed that a rate 1/2 ARJA protograph based SC-LDPC code with graph lifting factor of 256 gives a coding gain of 47 dB at a BER of 10 −4 for strong turbulence channel model with pointing errors. An analytical BER expression for UWOC link under strong turbulence with pointing errors for On-Off Keying modulation technique has been derived. A multidimensional protograph based extrinsic information transfer algorithm has been developed to obtain the decoding thresholds for different channel parameters and code rates. We have also studied the SC-LDPC coded vertical UWOC link performance for some specific strong turbulence channel parameters with pointing errors and observed that as the link length increases from 20 m to 40 m, the performance gap between the hypothetical and cascaded channel models increases from 1.1 dB to 5.5 dB.INDEX TERMS Bit error rate, Low-density parity-check codes, Pointing errors, Protograph, Scintillation index, Spatially coupled LDPC codes, Underwater optical wireless communication.

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“…According to the literature [20][21][22][23], it is known that the gamma-gamma turbulence model can accurately describe the probability density function of the signal light intensity decay under the medium-intensity ocean turbulence effect [24]; thus, the probability density function is expressed as…”

Section: Uwoc Turbulence Channel Modelmentioning

confidence: 99%

Error Characterization of Differential Detection and Non-Differential Detection for MIMO UWOC Systems in Seawater Turbulent Channels

Tong

Zhao

et al. 2023

Photonics

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Ocean turbulence is an important factor affecting the development of underwater wireless optical communication (UWOC). To improve the error characteristics of the underwater optical communication system, we propose a differential detection-based multi-receiver-multi-transmitter (MIMO) underwater laser communication transmission method. Additionally, we derive the expressions for calculating the average BER of the MIMO underwater wireless optical communication system with differential detection and non-differential detection in the case that the two transmitted beams are completely uncorrelated. The error characteristics of the MIMO system are simulated and analyzed from the perspective of ocean turbulence intensity and link distance. The simulation results show that the differential detection method has a lower average BER compared to the non-differential detection method in the case of moderate-to-strong ocean turbulence. In addition, the differential detection methods do not have the error floor effect, and non-differential detection methods have the error floor effect. The more the turbulence intensity affects the average BER of the MIMO UWOC system with the increase of the communication link distance, the more obvious is the effect of the turbulence intensity on the average BER of the MIMO UWOC system. Accordingly, the simulation analysis shows that the differential detection method is more suitable for the construction of communication links under long-distance and medium-strong turbulence.

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Average BER performance of rectangular QAM-UWOC over strong oceanic turbulence channels with pointing error

Cited by 19 publications

References 22 publications

Effects of Anisotropic Turbulent Ocean on Propagation of Asymmetric Bessel-Gaussian Beam

Effects of Anisotropic Turbulent Ocean on Propagation of Asymmetric Bessel-Gaussian Beam

Performance of Spatially Coupled LDPC Codes Over the Underwater Wireless Optical Channel With Strong Turbulence and Pointing Errors

Error Characterization of Differential Detection and Non-Differential Detection for MIMO UWOC Systems in Seawater Turbulent Channels

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