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Hybrid Chirp Signal Design for Improved Long-Range (LoRa) Communications
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  • Md. Noor-A-Rahim ,
  • Mohammad Omar Khyam ,
  • Apel Mahmud ,
  • Xinde Li ,
  • Dirk Pesch ,
  • H. Vincent Poor
Md. Noor-A-Rahim
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Mohammad Omar Khyam
Central Queensland University

Corresponding Author:[email protected]

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Apel Mahmud
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Dirk Pesch
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H. Vincent Poor
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Abstract

Long-range (LoRa) communication has attracted much attention recently due to its application for many Internet of Things applications. However, one of the key problems of the LoRa technology is 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 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 bit error rate of 10^-4.
05 Jan 2022Published in Signals volume 3 issue 1 on pages 1-10. 10.3390/signals3010001