Geometric Constellation Shaping for Wireless Optical Intensity Channels: An Information-Theoretic Approach

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2024-12-04 DOI:10.1109/LCOMM.2024.3511129

Suhua Zhou;Tianqi Li;Zhaoxi Fang;Jing Zhou;Wenyi Zhang

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引用次数: 0

Abstract

A simple geometric shaping method is proposed for optical wireless communication systems based on intensity modulation and direct detection (IM/DD) from an information-theoretic perspective. Constellations consisting of equiprobable levels with exponential-like distribution are obtained, which possesses asymptotic optimality in the sense that the high-SNR capacity of average-intensity constrained optical intensity channel can be approached by such constellations with increasing size. All

$2^{b}$

levels (

$b\in \mathbb {N}$

) of the obtained constellation can be represented by a basic level and

$b+2$

bits, thereby reducing the required resolution of the digital-to-analog converter (DAC) without affecting the asymptotic optimality. Achievable information rate evaluations verify the asymptotic optimality. As an example, error performance results of a simple 16-level LDPC coded modulation scheme show that a shaping gain of 0.65 dB can be obtained by applying the proposed constellation design. This method can also be applied to more specific IM/DD channel models, since it only requires a near-optimal continuous input distribution.

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无线光强信道的几何星座整形：一种信息论方法

从信息论的角度，提出了一种基于强度调制和直接检测（IM/DD）的光无线通信系统的简单几何整形方法。得到了由指数分布的等概率能级组成的星群，具有渐近最优性，即随着星群尺寸的增大，平均强度受限光强信道的高信噪比容量可以接近。所得星座的所有$2^{b}$电平（$b\in \mathbb {N}$）都可以用一个基本电平和$b+2$位表示，从而在不影响渐近最优性的情况下降低了数模转换器（DAC）所需的分辨率。可实现的信息率评估验证了渐近最优性。以一种简单的16级LDPC编码调制方案为例，误差性能结果表明，采用该星座设计可获得0.65 dB的整形增益。这种方法也可以应用于更具体的IM/DD信道模型，因为它只需要接近最优的连续输入分布。

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 Communications Letters 工程技术-电信学

CiteScore

8.10

自引率

7.30%

发文量

590

审稿时长

2.8 months

期刊介绍： The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of communication systems.