BEN TEMIM, Mohamed Amine; FERRÉ, Guillaume; TAJAN, Romain

doi:10.3390/s22051830

Laboratoire de l'intégration, du matériau au système [IMS]

FERRÉ, Guillaume
Laboratoire de l'intégration, du matériau au système [IMS]

TAJAN, Romain

Laboratoire de l'intégration, du matériau au système [IMS]

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Article de revue

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Sensors. 2022-02, vol. 22, n° 5, p. 1830

Resumen en inglés

LoRa is based on the chirp spread spectrum (CSS) modulation, which has been developed for low power and long-range wireless Internet of Things (IoT) communications. The structure of LoRa signals makes their decoding performance extremely sensitive to synchronization errors. To alleviate this constraint, we propose a modification of the LoRa physical layer, which we refer to as differential CSS (DCSS), associated with an original synchronization algorithm. Based on this modification, we are able to demodulate the received signals without performing a complete frequency synchronization and by tolerating some timing synchronization errors. Hence, our receiver can handle ultra narrow band LoRa-like signals since it has no limitation on the maximum carrier frequency offset, as is actually the case in the deployed LoRa receivers. In addition, in the presence of the Doppler shift varying along the packet duration, DCSS shows better performance than CSS, which makes our proposed receiver a good candidate for communication with a low-Earth orbit (LEO) satellite.< Leer menos

Palabras clave en inglés

DCSS

Doppler effects

IoT

LoRa

LPWAN

low-Earth orbit satellite

synchronization

URI

https://oskar-bordeaux.fr/handle/20.500.12278/140448

DOI

http://dx.doi.org/10.3390/s22051830

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IMS : Laboratoire de l'Intégration du Matériau au Système - UMR 5218

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A New LoRa-like Transceiver Suited for LEO Satellite Communications

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Centros de investigación