中圖分類號： TN929.5 文獻(xiàn)標(biāo)識碼： A DOI：10.16157/j.issn.0258-7998.211637 中文引用格式： 雷芳,，陳博，呂京昭,，等. LoRa空口數(shù)據(jù)的同步與解調(diào)[J].電子技術(shù)應(yīng)用,，2022，48(4)：81-85. 英文引用格式： Lei Fang,，Chen Bo,，Lv Jingzhao，et al. Synchronization and demodulation of LoRa null port data[J]. Application of Electronic Technique,，2022,，48(4)：81-85.
Synchronization and demodulation of LoRa null port data
Lei Fang1，Chen Bo1,，Lv Jingzhao1,，Li Pingan1，Du Haitao2,，Li Su2
1.School of Communication and Information Engineering,，Chongqing University of Posts and Telecommunications， Chongqing 400065,，China,； 2.Research Institute of China Mobile Communications Group Corporation，Beijing 100053,，China
Abstract： LoRa communication technology has the characteristics of low power consumption and long distance, and has attracted more and more attention in life. However, for the underlying LoRa modulation and demodulation technology and the physical layer communication link flow, the official does not have the public technical document description, only some literature mentioned these contents. This paper improves the physical layer communication link flow by combining the LoRa modulation parameter configuration interface the official Rhode instrument with the literature. The principle of LoRa modulation and demodulation technology is described in essence, and the LoRa modulation data are collected from the Rhode instrument null port. The modulation and demodulation algorithm of LoRa literature is verified, and a synchronization algorithm of LoRa null port data is proposed. The LoRa demodulation of null port data is realized. Finally, the noise resistance performance was simulated for the LoRa modulation technique at 5 code rates. The simulation results show that the reduction of bit rate does not mean that the anti-noise ability of the system will be improved. The code rate is 4/5 with the best effect error correction, and the noise resistance performance improves by about 1 dB.
Key words : LoRa,；Rhode instrument；communication links,；null port data,；synchronization algorithm
0 引言
近年來，智能設(shè)備的蜂擁而起,，先后涌現(xiàn)了一系列的無線通信技術(shù),，被大規(guī)模應(yīng)用于各個行業(yè)各種應(yīng)用場景。其中,，在廣域網(wǎng)通信技術(shù)中,，LoRa是一種前景比較好的低功耗廣域網(wǎng)(Low Power Wide Area Network,，LPWAN)[1-3]技術(shù)，主要應(yīng)用于具有低功耗,、遠(yuǎn)距離特點的應(yīng)用場景,，如智能抄表[4]、智慧農(nóng)業(yè)[5],、智慧城市[6]等,。
