低码率扩频通信LoRa传输距离分析及数据测试 分析

摘要

针对LoRa低码率扩频通信，本文首先对无线通信的空间传输进行分析，分析其传输过程中传输距离的相关因素。首先分析在理想环境中，无线通信中收、发天线间距离D与发射器的发射功率、接收器的灵敏度、发射天线增益、接收天线增益、载波频率、基站发射天线的馈线插损、因环境带来的空中传播损耗的关系，从而理论分析传输距离的影响因素。分析LoRa扩频通信的基本原理，将其与FSK调制进行对比其性能特点。最终通过大量的试验测试，对传输距离、丢包率、信号质量、信噪比指标进行分析，得到实测与理论的对比结果。 In view of LoRa low bit rate spread spectrum communication, this paper first analyzes the spatial transmission of wireless communication, and analyzes the relevant factors of transmission distance in the transmission process. Firstly, the relationship between the distance d between the receiving and transmitting antennas and the transmitting power of the transmitter, the sensitivity of the receiver, the gain of the transmitting antenna, the gain of the receiving antenna, the carrier frequency, the insertion loss of the base station’s transmitting antenna’s feeders and the air transmission loss caused by the environment is analyzed in the ideal environment, so as to theoretically analyze the influencing factors of the transmission distance. The basic principle of Lora spread spectrum communication is analyzed and compared with FSK modulation. Finally, through a large number of tests, transmission distance, packet loss rate, signal quality, signal-to-noise ratio index are analyzed, and the comparison results between the actual measurement and the theory are obtained.