LoRa data packet starting point alignment method and device

Abstract

The embodiment of the invention provides a LoRa data packet starting point alignment method and device, and the method comprises the steps: carrying out the de-spreading of any one upper sweep frequency symbol and any one lower sweep frequency symbol in a lead code of a LoRa data packet if a current signal received by a gateway is detected to contain the LoRa data packet, and then carrying out theFourier transform, obtaining the peak frequency of the upper swept-frequency symbol and the peak frequency of the lower swept-frequency symbol; calculating the carrier frequency offset of the currentsignal according to the peak frequencies of the upper swept-frequency symbol and the lower swept-frequency symbol; and according to the carrier frequency offset, calculating a time offset between a receiving window starting point of the gateway for receiving the current signal and a starting point of the LoRa data packet, and adjusting the receiving window starting point according to the time offset, so that the receiving window starting point is aligned with the starting point of the LoRa data packet. According to the embodiment of the invention, accurate alignment of the starting point of the LoRa data packet is realized.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method and device for aligning the start point of a LoRa data packet. Background technique [0002] LoRa (Long Range Radio, long-range radio) technology is a low-power wide-area network technology designed to achieve long-distance, long battery life and high-capacity wireless Internet of Things 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 receiving end 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 interoperabil...

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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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