Combination for Modulation: Toward Enhancing LoRa Link Capacity

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2025-03-20 DOI:10.1109/LCOMM.2025.3571808

Haotian Zhang;Yaping Li;Yang Luo;Guodong Sun

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引用次数: 0

Abstract

In recent years, Long Range (LoRa) modulation has attracted much attention from both academia and industry because of its capability to offer long-distance, low-power communication through the use of chirp spread spectrum (CSS) modulation at the physical layer. However, LoRa is slow in link speed, reaching a maximum data rate of 50 kbps, and unable to deliver adequate data rates. We present Combination-Encoded CSS (CE-CSS), which is compatible to the legacy LoRa. At the physical layer, CE-CSS can transmit multiple concurrent symbols in a single chirp period to increase link capacity, while avoiding the need for complex demodulation processes. The core of CE-CSS is a combination-encoded mechanism that focuses on encoding combinations of all concurrent symbols, rather than only modulating individual symbols. CE-CSS enables standard LoRa demodulation to extract out the concurrent symbols by only one pass of Fast Fourier Transform, without requiring any complex processes or customized hardware deployed at the gateway. The simulation-based experiments show the effectiveness and efficiency of our design.

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调制组合：提高LoRa链路容量

近年来，远程（LoRa）调制因其在物理层使用啁啾扩频（CSS）调制提供远距离、低功耗通信的能力而受到学术界和工业界的广泛关注。但是，LoRa的链路速度较慢，最大数据速率为50kbps，无法提供足够的数据速率。我们提出了与遗留的LoRa兼容的组合编码CSS （CE-CSS）。在物理层，CE-CSS可以在单个啁啾周期内传输多个并发符号，以增加链路容量，同时避免需要复杂的解调过程。CE-CSS的核心是一种组合编码机制，其重点是对所有并发符号的组合进行编码，而不仅仅是调制单个符号。CE-CSS使标准的LoRa解调仅通过一次快速傅里叶变换就能提取出并发符号，而不需要在网关部署任何复杂的过程或定制硬件。仿真实验证明了该设计的有效性和高效性。

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 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.