Mr. Jinguo Quan Profile

Jinguo Quan

at Tsinghua Univ.

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Publications (4)

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Proceedings Article | 24 November 2021 Paper

Angle of arrival of underwater wireless optical communications

Pengcheng Niu, Fan Yang, Shuang Jin, Jinguo Quan, Yuhan Dong

Proceedings Volume 12066, 120661P (2021) https://doi.org/10.1117/12.2607170

KEYWORDS: Scattering, Light sources, Light scattering, Receivers, Wireless communications, Laser scattering, Absorption, Signal attenuation, Monte Carlo methods, Reliability, Dispersion

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Underwater wireless optical communication (UWOC) has been regarded as one of the promising solutions to underwater wireless communication systems due to its advantages of high bandwidth, fast transmission and good confidentiality. In UWOC systems, after emitting from light source, photons will be scattered with random deviated angles before propagating to the receiver plane. Hence, the light beam suffers a spatial angle spread at the receiver side. In order to improve the system performance with an appropriate receiver design, it is of significance to figure out the angle of arrival (AOA) distribution of the received light beam. In addition, the UWOC channel is susceptible to other effects such as absorption, turbulence and bubbles, especially when it is exposed to the complex ocean environment. Therefore, analyzing the impacts of these factors on AOA distribution is also essential to evaluate UWOC system performance. The existing studies of AOA distribution only considered single scattering component, which is not practical for turbid water. Furthermore, there are few studies focusing on multi-source scenarios. In this paper, we first present a simple expression for AOA distribution with single light source, taking both single and multiple scattering components into account. Then we extend the work to multi-source scenarios and derive the corresponding closed-form expression of AOA distribution. Compared to the traditional single scattering case, numerical results show that the proposed AOA distribution can fit well with Monte Carlo simulation results with various water types, link distances, and the characteristics of actual light sources.

Proceedings Article | 24 November 2021 Paper

On BER performance for misaligned underwater wireless MISO laser links

Sen Du, Shi Zhang, Shuang Jin, Jinguo Quan, Yuhan Dong

Proceedings Volume 12066, 120661O (2021) https://doi.org/10.1117/12.2607167

KEYWORDS: Light sources, Receivers, Wireless communications, Scattering, Photons, Optical transfer functions, Optical alignment, Light scattering, Laser sources, Systems modeling

Read Abstract +

Underwater wireless optical communication (UWOC) highly depends on the alignment between the receiver and transmitter in realization. In practice, the facts that laser sources have narrow divergence angles, water body suﬀers from ﬂuctuation, and precise positioning is very diﬃcult in the underwater environment bring great challenges to the link alignment as well as practical implementation. However, due to the intrinsic optical properties of seawater, photons will be scattered during the transmission process, resulting in the diﬀusion of light, which relaxes the requirements for strict alignment. Inspired by the uniform spatial distribution of the multi-source arrays with a close spacing, in this paper, we investigate the bit error rate (BER) performance of the multi-input single-output (MISO) laser links in the presence of receiver oﬀset. Based on a system model by considering scattering and absorption eﬀects and noises including background noise and blackbody radiation as well as OOK signaling and an ideal photon counter, we derived a closed-form expression of relationship among BER, transmit power, link range, receiver aperture and oﬀset distance, which is veriﬁed by Monte Carlo simulations. Numerical results suggest that, regardless of water types, linear light source arrays parallel to the oﬀset direction can improve the tolerance of receiver oﬀset with speciﬁc transmit power and link range for reliable communications. On this basis, we compared the anti-oﬀset performance in the case of diﬀerent inter-spacings of light source arrays such as dual-source and three-source schemes and also derived the optimal inter-spacing for light source to maximize the acceptable oﬀset distance with reliable communication for dual-source links.

Proceedings Article | 4 December 2020 Paper

Channel estimation for OFDM-based underwater wireless optical communication systems

Yafei Ma, Zuhang Geng, Shuang Jin, Jinguo Quan, Yuhan Dong

Proceedings Volume 11617, 116173W (2020) https://doi.org/10.1117/12.2585526

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Underwater wireless optical communications (UWOC) could transmit data using blue or green light beams with high data rate and safety in a relatively short range. OFDM based UWOC systems are able to further increase data rate, however, highly dependent on the accuracy of channel estimation. In this paper, we consider the channel estimation problem for OFDM based UWOC systems. We firstly apply Monte Carlo simulation to obtain the channel impulse response (CIR) of UWOC links under different conditions to facilitate the design of the subsequent OFDM systems. Secondly, we evaluate the pilot-based least squares (LS), and two types discrete Fourier transform (DFT) channel estimation methods and compare their performance. Numerical results have suggested that the temporal pulse spread strongly degrades the performance of the channel estimation. These two DFT methods especially DFT channel estimation with noise threshold method achieved the best performance among these prior works. While for the signal-to-noise ratio (SNR) less than 10 dB, the performance of DFT with noise threshold method is still poor. To solve this problem, we propose a new channel estimation approach of DFT with adaptive noise threshold (DFT-ANT) which adaptively adjusts the noise threshold based on SNR, and analyze its complexity and normalized mean square error (NMSE) performance in underwater environment. Numerical results have validated the proposed approach which outperforms existing channel estimation methods especial DFT with noise threshold method in terms of accuracy for various water types.

Proceedings Article | 4 December 2020 Paper

Spatial channel model for underwater wireless optical communication links

Sen Du, Shi Zhang, Shuang Jin, Jinguo Quan, Yuhan Dong

Proceedings Volume 11617, 116173U (2020) https://doi.org/10.1117/12.2585523

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In order to evaluate the performance of underwater wireless optical communication (UWOC) systems, it is of significance to fully understand the impact of spatial diffusion of light beams. Meanwhile, simple and highly adaptable spatial channel modeling is also necessary and essential for performance evaluation and system design. In this paper, we focus on the spatial channel modeling and, in particular, quantify the photon spatial distributions for different water types, link distances, and transmitter/receiver characteristics. Via using the Gaussian distribution to complete the fitting, we have proposed a simple expression to describe the spatial irradiance distribution. The numerical results have shown that the proposed spatial channel model for UWOC systems agrees well with the Monte Carlo simulation results in terms of mean square error (MSE) with or below the order of 10⁻⁷ in both turbid coastal and harbor water and demonstrates a high adaptability to the link conditions. Furthermore, on this basis, we extend the study from single source to multi-source scenario and derive the corresponding expression of spatial channel model. Considering the integrity of closely spaced multi-source array, the multi-source model has been further simplified by two-dimensional Gaussian fitting.

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