Alignment method and device for starting point of lora data packet

Abstract

The embodiment of the present invention provides a method and device for aligning the starting point of a LoRa data packet, including: if it is detected that the current signal received by the gateway contains a LoRa data packet, any upper frequency sweep symbol and After any down-sweep symbol is despread separately, then Fourier transform is performed to obtain the peak frequency of the up-sweep symbol and the peak frequency of the down-sweep symbol; according to the up-sweep symbol and the down-sweep symbol Calculate the carrier frequency offset of the current signal; according to the carrier frequency offset, calculate the time offset between the starting point of the receiving window of the gateway receiving the current signal and the starting point of the LoRa data packet, and adjust the starting point of the receiving window according to the time offset, To align the start of the receive window with the start of the LoRa packet. The embodiment of the present invention realizes the precise alignment of the starting point of the LoRa data packet.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and in particular, to a method and device for aligning the origin of LoRa data packets. Background technique [0002] LoRa (Long Range Radio, long-range radio) technology is a low-power wide-area network technology that aims to achieve long-distance, long battery life and large-capacity wireless IoT connections, and has received extensive attention in industry and academia. Current research on LoRa includes transmission protocol optimization, conflicting signal decoding, and cross-protocol communication. [0003] In order to meet the needs of the receiver to collect and process LoRa physical layer signals, existing research uses software-defined radio gateways to receive and decode LoRa signals. Compared with dedicated gateways, software-defined radio gateways can provide a large number of programmable control interfaces with higher flexibility and interoperability. Decod...

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Problems solved by technology

[0005] Embodiments of the present invention provide a method and device for aligning the starting point of a LoRa data packet, which is used to solve the problem in the prior art that the starting point of the LoRa data packet cannot be accurately searched only based on the correlation in the time domain, so that the starting point of the gateway receiving window is aligned with the LoRa data packet. The defect that the starting point of the packet cannot be precisely aligned to achieve precise alignment of the starting point of the LoRa data packet

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