Performance Enhancement of FEC-Coded 32QAM DMT Signals With Rate-Flexible HCS in FSO Systems

IF 2.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Photonics Technology Letters Pub Date : 2024-07-31 DOI:10.1109/LPT.2024.3434993

Xiaoyu Liu;Weiying Yang;Zhiyang Liu;Shilin Xiao

引用次数: 0

Abstract

A rate-flexible hybrid constellation shaping (HCS) is proposed and demonstrated in polar-coded discrete multi-tone (DMT) free-space optical (FSO) communications. This joint design considers the constraints of geometry and probabilities in coded modulations to maximize the channel capacity and flexibly adjusts the parameters according to the data rates. Compared to the regular scheme over free-space links, the capacity of the proposed scheme at different data rates is improved by about 0.25 bits/ symbol when the launch power is -6dBm. And the power budgets of our approach with polar codes are saved more than 1.0 dB at the bit error rate of

${10}^{-4}$

. Even in weak turbulence conditions, the Q2 factor of the proposed maintains the maximum and is improved by

$1.84\sim 3.40$

dB than the regular scheme, indicating its better ability to combat turbulence.

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在 FSO 系统中利用速率灵活的 HCS 提高 FEC 编码 32QAM DMT 信号的性能

在极地编码离散多音（DMT）自由空间光（FSO）通信中提出并演示了一种速率灵活的混合星座整形（HCS）。这种联合设计考虑了编码调制中的几何和概率约束，以最大化信道容量，并根据数据速率灵活调整参数。与自由空间链路上的常规方案相比，当发射功率为-6dBm时，拟议方案在不同数据速率下的容量提高了约0.25比特/符号。而在误码率为 ${10}^{-4}$ 时，我们的方法与极地编码的功率预算节省了 1.0 dB 以上。即使在弱湍流条件下，所提方案的 Q2 因子仍能保持最大值，并比常规方案提高了 1.84/sim 3.40$ dB，表明其抗击湍流的能力更强。

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 Technology Letters 工程技术-工程：电子与电气

CiteScore

5.00

自引率

3.80%

发文量

404

审稿时长

2.0 months

期刊介绍： IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology. Examples of subject areas for the above areas of concentration are integrated optic and optoelectronic devices, high-power laser arrays (e.g. diode, CO2), free electron lasers, solid, state lasers, laser materials'' interactions and femtosecond laser techniques. The letters journal publishes engineering, applied physics and physics oriented papers. Emphasis is on rapid publication of timely manuscripts. A goal is to provide a focal point of quality engineering-oriented papers in the electro-optics field not found in other rapid-publication journals.