LoRa同步叠加信号的解调

应用科学学报 ›› 2022, Vol. 40 ›› Issue (5): 770-778.doi: 10.3969/j.issn.0255-8297.2022.05.006

• 通信工程 • 上一篇下一篇

LoRa同步叠加信号的解调

雷芳, 陈博, 吕京昭, 李平安, 秦红

重庆邮电大学通信与信息工程学院, 重庆 400065

收稿日期:2021-04-23 出版日期:2022-09-30 发布日期:2022-09-30
通信作者: 雷芳,副教授,研究方向为嵌入式系统、移动通信。E-mail:leifang1@cqupt.edu.cn E-mail:leifang1@cqupt.edu.cn

Demodulation of LoRa Synchronous Superposition Signals

LEI Fang, CHEN Bo, Lü Jingzhao, LI Pingan, QIN Hong

School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Received:2021-04-23 Online:2022-09-30 Published:2022-09-30

摘要/Abstract

摘要： 为了提高LoRa技术单位时间内的传输速率，提出了一种新的LoRa同步叠加信号解调算法。首先，理论分析了相同扩频信道LoRa叠加信号解调的核心问题是区分不同节点的信号，仿真分析了当2个节点信号的功率差大于5 dB时，即可解调出2个节点的数据并指出了该方法的不足之处；其次，提出了一种使用LoRa调制符号的最高位为标志位，作为区分2个节点数据的新算法，指明了该算法的使用场景并发现它与LoRa技术解调算法的复杂度基本相同。仿真结果表明，新算法不会增加LoRa解调算法的误比特率，与LoRa技术解调算法相比，新算法大幅度提高了LoRa数据包的传输速率并降低了传输有效信息的比特能耗。

关键词: LoRa, 叠加信号, 标志位, 传输速率, 比特能耗

Abstract: In order to improve the transmission rate of LoRa technology, a new demodulation algorithm for LoRa synchronous superimposed signals is proposed. In this paper, we first theoretically find that the core problem of demodulation of LoRa superposition signals in the same expansion frequency channel is to distinguish the signals of different nodes, and if the power difference of two nodes is greater than 5 dB, the data of the two nodes can be demodulated. Moreover, the disadvantages of the method are also indicated. Second, we propose a algorithm of using the LoRa modulation symbol as the highest marker bit to distinguish the data of two nodes, indicate the application scenario of the algorithm, and prove that it has the same complexity as the demodulation algorithm of LoRa technique. Simulation results show that the new algorithm will not increase the bit error rate of the LoRa demodulation algorithm, and compared with the demodulation algorithm of LoRa technology, the new algorithm greatly improves the transmission rate of LoRa packets and reduces the bit energy consumption of transmitting effective information.

Key words: LoRa, superposed signal, flag bit, transmission rate, bit energy consumption

中图分类号:

TN925.5

雷芳, 陈博, 吕京昭, 李平安, 秦红. LoRa同步叠加信号的解调[J]. 应用科学学报, 2022, 40(5): 770-778.

LEI Fang, CHEN Bo, Lü Jingzhao, LI Pingan, QIN Hong. Demodulation of LoRa Synchronous Superposition Signals[J]. Journal of Applied Sciences, 2022, 40(5): 770-778.

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