@article{PCube_MobiCom21,
author = {Xia, Xianjin and Hou, Ningning and Zheng, Yuanqing and Gu, Tao},
title = {PCube: Scaling LoRa Concurrent Transmissions with Reception Diversities},
year = {2023},
issue_date = {November 2022},
publisher = {Association for Computing Machinery},
address = {New York, NY, USA},
volume = {18},
number = {4},
issn = {1550-4859},
url = {https://doi.org/10.1145/3545571},
doi = {10.1145/3545571},
abstract = {This article presents the design and implementation of PCube, a phase-based parallel packet decoder for concurrent transmissions of LoRa nodes. The key enabling technology behind PCube is a novel air-channel phase measurement technique that is able to extract phase differences of air-channels between LoRa nodes and multiple antennas of a gateway. PCube leverages the reception diversities of multiple receiving antennas of a gateway and scales the concurrent transmissions of a large number of LoRa nodes, even exceeding the number of receiving antennas at a gateway. As a phase-based parallel decoder, PCube provides a new dimension to resolve collisions and supports more concurrent transmissions by complementing time and frequency-based parallel decoders. PCube is implemented and evaluated with synchronized software defined radios and off-the-shelf LoRa nodes in both indoors and outdoors. Results demonstrate that PCube can substantially outperform state-of-the-art works in terms of aggregated throughput by 4.9\texttimes{} and the number of concurrent nodes by up to 5\texttimes{}. More importantly, PCube scales well with the number of receiving antennas of a gateway, which is promising to break the barrier of concurrent transmissions.},
journal = {ACM Trans. Sen. Netw.},
month = {mar},
articleno = {66},
numpages = {25},
keywords = {packet collision, concurrent transmission, LoRa, Low-power wide-area networks, interference cancellation}
}