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Low power wide area network technologies (LPWANs) are attracting attentionbecause they fulfill the need for long range low power communication for theInternet of Things. LoRa is one of the proprietary LPWAN physical layer (PHY)technologies, which provides variable data-rate and long range by using chirpspread spectrum modulation. This paper describes the basic LoRa PHY receiveralgorithms and studies their performance. The LoRa PHY is first introduced anddifferent demodulation schemes are proposed. The effect of carrier frequencyoffset and sampling frequency offset are then modeled and correspondingcompensation methods are proposed. Finally, a software-defined radioimplementation for the LoRa transceiver is briefly presented.

LoRa Digital Receiver Analysis and Implementation