A Two-User Successive Interference Cancellation LoRa Receiver with Soft-Decoding
(2021) 2021 Asilomar Conference on Signals, Systems, and Computers — Location: Pacific Grove, CA, USA (1.November.2021)
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- Abstract
- LoRaWAN is a popular wireless technology that provides long-range connectivity to Internet-of-Things devices using a bit-interleaved coded modulation. To minimize their energy consumption, LoRaWAN end-nodes implement a pure ALOHA access scheme, which leads to collisions among users at the gateway and a reduced throughput in crowded networks. To improve the throughput of interference-limited LoRaWAN networks, we design in this paper a successive interference cancellation receiver that is able to decode frames from two colliding users. By performing both a soft-demodulation and soft-decoding to recover the message of each interfering user, the proposed two-user receiver explicitly leverages the coded spread spectrum modulation of LoRa. We show that the joint usage of interleaving and coding is critical to achieve a decent cancellation of the strongest user. Simulation results indicate that our two-user receiver successfully demodulates the frames of two interfering users with a 1.5 dB difference of received powers, even at very low signal-to-noise ratios.
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Citations
Xhonneux, M., Tapparel, J., Scheepers, P., Afisiadis, O., Balatsoukas-Stimming, A., Bol, D., Louveaux, J., & Burg, A. (2021). A Two-User Successive Interference Cancellation LoRa Receiver with Soft-Decoding. 2021 Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, USA. https://hdl.handle.net/2078.5/219331