Impact of LoRa Imperfect Orthogonality: Analysis of Link-Level Performance
| Autor: | Giuseppe Santaromita, Stefano Mangione, Daniele Croce, Ilenia Tinnirello, Michele Gucciardo |
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| Přispěvatelé: | Daniele Croce, Michele Gucciardo, Stefano Mangione, Giuseppe Santaromita, Ilenia Tinnirello |
| Rok vydání: | 2018 |
| Předmět: |
LoRa
spreading factor interference Settore ING-INF/03 - Telecomunicazioni Network packet Computer science business.industry 010401 analytical chemistry interference 020206 networking & telecommunications 02 engineering and technology LoRa 01 natural sciences 0104 chemical sciences Computer Science Applications Packet loss Modulation Modeling and Simulation 0202 electrical engineering electronic engineering information engineering Chirp spreading factor Link level Imperfect Electrical and Electronic Engineering business Computer network |
| Zdroj: | IEEE Communications Letters |
| ISSN: | 2373-7891 1089-7798 |
| DOI: | 10.1109/lcomm.2018.2797057 |
| Popis: | In this letter, we focus on the evaluation of link-level performance of LoRa technology, in the usual network scenario with a central gateway and high-density deployment of end-devices. LoRa technology achieves wide coverage areas, low power consumption and robustness to interference thanks to a chirp spread-spectrum modulation, in which chirps modulated with different spreading factors (SFs) are quasi-orthogonal. We focus on the performance analysis of a single receiver in presence of collisions. First, we analyze LoRa modulation numerically and show that collisions between packets modulated with different SFs can indeed cause packet loss if the interference power received is strong enough. Second, we validate such findings in experiments based on commercial devices and software-defined radios. Contradicting the common belief that SFs can be considered orthogonal, our results demonstrate that inter-SF collisions are indeed an issue in LoRa networks and, thus, allocating higher SFs to users far from the gateway might not necessarily improve their link capacity, in case of congested networks. |
| Databáze: | OpenAIRE |
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