Search results for " spreading factor"

showing 3 items of 3 documents

Capture Aware Sequential Waterfilling for LoraWAN Adaptive Data Rate

2020

LoRaWAN (Long Range Wide Area Network) is emerging as an attractive network infrastructure for ultra low power Internet of Things devices. Even if the technology itself is quite mature and specified, the currently deployed wireless resource allocation strategies are still coarse and based on rough heuristics. This paper proposes an innovative "sequential waterfilling" strategy for assigning Spreading Factors (SF) to End-Devices (ED). Our design relies on three complementary approaches: i) equalize the Time-on-Air of the packets transmitted by the system's EDs in each spreading factor's group; ii) balance the spreading factors across multiple access gateways, and iii) keep into account the c…

FOS: Computer and information sciencesComputer scienceDistributed computingInternet of ThingsWireless communicationresource allocationServers02 engineering and technologyNetwork topologyspreading factorsinter-SF interferenceComputer Science - Networking and Internet Architecturechannel captureBandwidthServerLPWAN0202 electrical engineering electronic engineering information engineeringWirelessComputer architectureElectrical and Electronic Engineeringinternet of t6hingsNetworking and Internet Architecture (cs.NI)Network packetbusiness.industryApplied MathematicsResource managementinternet of t6hings; LoRaWAN; spreading factors; resource allocation; adaptive data rate; channel capture; inter-SF interference020206 networking & telecommunicationsComputer Science ApplicationsLoRaWANadaptive data rateWide area networkScalabilityHeuristicsbusinessInterferenceUplinkCommunication channel
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Impact of LoRa Imperfect Orthogonality: Analysis of Link-Level Performance

2018

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…

LoRa spreading factor interferenceSettore ING-INF/03 - TelecomunicazioniNetwork packetComputer sciencebusiness.industry010401 analytical chemistryinterference020206 networking & telecommunications02 engineering and technologyLoRa01 natural sciences0104 chemical sciencesComputer Science ApplicationsPacket lossModulationModeling and Simulation0202 electrical engineering electronic engineering information engineeringChirpspreading factorLink levelImperfectElectrical and Electronic EngineeringbusinessComputer networkIEEE Communications Letters
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LoRa Technology Demystified: From Link Behavior to Cell-Level Performance

2020

In this paper we study the capability of LoRa technology in rejecting different interfering LoRa signals and the impact on the cell capacity. First, we analyze experimentally the link-level performance of LoRa and show that collisions between packets modulated with the same Spreading Factor (SF) usually lead to channel captures, while different spreading factors can indeed cause packet loss if the interference power is strong enough. Second, we model the effect of such findings to quantify the achievable capacity in a typical LoRa cell: we show that high SFs, generally seen as more robust, can be severely affected by inter-SF interference and that different criteria for deciding SF allocati…

LoRa spreading factor interferenceSettore ING-INF/03 - Telecomunicazionibusiness.industryNetwork packetComputer scienceApplied Mathematics020206 networking & telecommunications02 engineering and technologyIP fragmentationInterference (wave propagation)Computer Science ApplicationsPacket loss0202 electrical engineering electronic engineering information engineeringWirelessElectrical and Electronic EngineeringTransmission timebusinessWireless sensor networkComputer networkPower controlCommunication channelIEEE Transactions on Wireless Communications
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