Hybrid Chirp Signal Design for Improved Long-Range (LoRa) Communications

Noor-A-Rahim, Md., Khyam, M. Omar, Mahmud, Md Apel, Li, Xinde, Pesch, Dirk and Poor, H. Vincent (2022) Hybrid Chirp Signal Design for Improved Long-Range (LoRa) Communications. Signals, 3 (1). pp. 1-10. ISSN 2624-6120

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Official URL: https://doi.org/10.3390/signals3010001


Long-range (LoRa) communication has attracted much attention recently due to its utility for many Internet of Things applications. However, one of the key problems of LoRa technology is that it is vulnerable to noise/interference due to the use of only up-chirp signals during modulation. In this paper, to solve this problem, unlike the conventional LoRa modulation scheme, we propose a modulation scheme for LoRa communication based on joint up- and down-chirps. A fast Fourier transform (FFT)-based demodulation scheme is devised to detect modulated symbols. To further improve the demodulation performance, a hybrid demodulation scheme, comprised of FFT- and correlation-based demodulation, is also proposed. The performance of the proposed scheme is evaluated through extensive simulation results. Compared to the conventional LoRa modulation scheme, we show that the proposed scheme exhibits over 3 dB performance gain at a bit error rate of 10−4.

Item Type: Article
Additional Information: Funding information: This publication has emanated from research conducted in part with the financial support of Science Foundation Ireland under Grant number 16/RC/3918. The work of H. V. Poor was supported in part by the U.S. National Science Foundation under Grant CCF-1908308.
Uncontrolled Keywords: LoRa, LoRaWAN, IoT, LPWAN, chirp modulation
Subjects: G500 Information Systems
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 10 Jan 2022 14:32
Last Modified: 16 Dec 2022 11:30
URI: https://nrl.northumbria.ac.uk/id/eprint/48118

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