Analysis of the Coexistence of Ultra Narrow Band and Spread Spectrum Technologies in ISM Bands

Temim, Mohamed Amine Ben; Ferré, Guillaume; Tajan, Romain

doi:10.1007/978-3-030-58008-7_5

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…However, even with the huge number of devices that could be connected to a LEO satellite, more sophisticated methods should be implemented. We quantified in [9] the impact of an ultra narrow band interference of LoRa-like communications in ISM bands. Given this massive connectivity, the use of ALOHA-based random access protocols, as in the case of ground-based LPWANs, is a challenging task.…”

Section: Introductionmentioning

confidence: 99%

A New LoRa-like Transceiver Suited for LEO Satellite Communications

Temim

Ferré

Tajan

2022

Sensors

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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.

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Section: Introductionmentioning

confidence: 99%

A New LoRa-like Transceiver Suited for LEO Satellite Communications

Temim

Ferré

Tajan

2022

Sensors

Self Cite

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“…• Since the 868 MHz band is shared by different WSN technologies, wireless coexistence (i.e., inter-network spectrum sharing) is inevitable. This means that the UNB signaling scheme needs to be robust against interference, while at the same time it needs to be friendly to other pre-existing technologies [40,84,85].…”

Section: Disadvantagesmentioning

confidence: 99%