Performance of Coherent Optical MPSK in Underwater Turbulent Channels With Phase Errors

IF 2.4 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Photonics Journal Pub Date : 2025-01-27 DOI:10.1109/JPHOT.2025.3534258

Jiashun Hu;Yuexiang Wu;Sunan Wang;Weiqiang Wu;Zaichen Zhang

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Abstract

Compared to intensity modulation with direct detection, coherent detection offers superior receiver sensitivity, higher spectral efficiency, and better background noise suppression. However, research on coherent detection in underwater wireless optical communication (UWOC) systems is relatively limited. This paper investigates the average bit error rate (BER) performance of coherent UWOC systems employing different phase-shift keying schemes in the presence of phase errors. The underwater turbulent channel is characterized by the mixture exponential-generalized gamma distribution, taking into account the impact of pointing errors as well. Phase errors are modeled by a Gaussian distribution. Specifically, we first derive the average BER expressions for

$M$

-ary phase-shift keying (MPSK) under ideal carrier phase estimation. Then, we derive the exact average BER expressions for binary phase-shift keying and quadrature phase-shift keying, as well as tight approximations for MPSK, considering the influence of phase errors. Additionally, we provide asymptotic BER expressions in the high signal-to-noise ratio region and the BER floor expression. Finally, these expressions are validated through Monte Carlo simulations.

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相干光MPSK在具有相位误差的水下湍流信道中的性能

与直接检测的强度调制相比，相干检测具有更高的接收机灵敏度、更高的频谱效率和更好的背景噪声抑制能力。然而，水下无线光通信（UWOC）系统中相干检测的研究相对有限。研究了存在相位误差时采用不同相移键控方案的相干UWOC系统的平均误码率（BER）性能。在考虑指向误差影响的情况下，水下湍流通道具有指数-广义混合分布的特征。相位误差采用高斯分布建模。具体来说，我们首先推导了在理想载波相位估计下，任意相移键控（MPSK）的平均误码率表达式。然后，我们推导了二相移键控和正交相移键控的精确平均误码率表达式，以及考虑相位误差影响的MPSK的严密逼近。此外，我们还提供了高信噪比区域的渐近误码率表达式和误码率底表达式。最后，通过蒙特卡罗仿真验证了这些表达式的正确性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Photonics Journal ENGINEERING, ELECTRICAL & ELECTRONIC-OPTICS

CiteScore

4.50

自引率

8.30%

发文量

489

审稿时长

1.4 months

期刊介绍： Breakthroughs in the generation of light and in its control and utilization have given rise to the field of Photonics, a rapidly expanding area of science and technology with major technological and economic impact. Photonics integrates quantum electronics and optics to accelerate progress in the generation of novel photon sources and in their utilization in emerging applications at the micro and nano scales spanning from the far-infrared/THz to the x-ray region of the electromagnetic spectrum. IEEE Photonics Journal is an online-only journal dedicated to the rapid disclosure of top-quality peer-reviewed research at the forefront of all areas of photonics. Contributions addressing issues ranging from fundamental understanding to emerging technologies and applications are within the scope of the Journal. The Journal includes topics in: Photon sources from far infrared to X-rays, Photonics materials and engineered photonic structures, Integrated optics and optoelectronic, Ultrafast, attosecond, high field and short wavelength photonics, Biophotonics, including DNA photonics, Nanophotonics, Magnetophotonics, Fundamentals of light propagation and interaction; nonlinear effects, Optical data storage, Fiber optics and optical communications devices, systems, and technologies, Micro Opto Electro Mechanical Systems (MOEMS), Microwave photonics, Optical Sensors.