Abstract
Enhancing the Reliability of Dense LoRaWAN Networks With Multi-User Receivers
Highlights
I N the past decade, LoRaWAN has emerged as the most popular wireless technology for ultra low-power internet of things (IoT) devices
Motivated by the resilience of the bit-interleaved coded modulation (BICM) scheme against time-varying channels, we present a two-user successive interference cancellation (SIC) soft-detector derived from the previously described iterative single-user detector
To reduce the level of inter-spreading factor (SF) interference and maintain decent signal-to-interference-plus-noise ratio (SINR) for the most distant nodes in the cell, we reduce the power of SF 7 nodes in steps of 3 dB as they approach closer to the gateway while keeping the 0.1% frame error rates (FERs) constraint
Summary
I N the past decade, LoRaWAN has emerged as the most popular wireless technology for ultra low-power internet of things (IoT) devices. To achieve long range communications in a stringent energy budget, its physical (PHY) layer, named LoRa, uses a chirp spread spectrum (CSS) modulation combined with Hamming codes in a bit-interleaved coded modulation (BICM) scheme [1], [2]. The potential benefits of leveraging the coding in the BICM scheme against sameSF interference, and the corresponding improvements of the network throughput, have not been investigated so far. Two main approaches have been followed in the literature to overcome same-SF collisions, which are the dominating error events in interference-limited LoRaWAN networks. We briefly summarize these attempts, and we further explain why multi-user LoRa receivers are a promising, and challenging, solution to improve the reliability and scalability of LoRaWAN networks
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