a MATLAB implementation for Chirp Spread Spectrum modulation used in LoRa
for up-chirp:
Xu, Zhenqiang, et al. "From Demodulation to Decoding: Towards Complete LoRa PHY Understanding and Implementation." ACM Transactions on Sensor Networks (TOSN) (2022).
“Lora PHY Based on GNU Radio.” EPFL, https://www.epfl.ch/labs/tcl/resources-and-sw/lora-phy/.