太赫兹科学与电子信息学报, 2018, 16 (6): 1027, 网络出版: 2019-06-10  

基于USRP的DBO-CSS系统研究与实现

Research and implementation of DBO-CSS system based on USRP
作者单位
中山大学 电子与信息工程学院,广东 广州 510006
摘要
LoRa是低功耗广域物联网的主流备选技术,差分双正交编码线性扩频(DBO-CSS)调制则是该技术的物理层传输方案。为了解决DBO-CSS技术在典型物联网场景中面临的快速同步捕获、低信噪比可靠接收等关键难题,基于NI公司的通用软件无线电设备(USRP)搭建了一套支持多用户接入的LoRa系统作为实验平台,采用仿真和空口测试相结合的方法,提出了基于改进匹配滤波器的同步算法和基于2D-Rake接收机的分集方案两项关键技术并完成性能验证。实验结果表明,改进的同步算法对准确度有所提高,而2D-Rake分集方案能使接收机获得约3 dB的信噪比增益。
Abstract
LoRa is one of the mainstream alternative technologies of Low-Power Wide-Area Network (LPWAN), which employs Differentially Bi-orthogonal Chirp Spread Spectrum(DBO-CSS) as its physical layer modulation. Rapid timing acquisition and reliable receiving in low SNR are the two most important issues when applying DBO-CSS in typical Internet of Things(IoT) scenarios. Therefore, a LoRa system supporting multi-user access is built utilizing the Universal Software Radio Peripheral(USRP) of NI Company. And two essential technologies including synchronization algorithm based on improved matching filter and diversity scheme based on 2D-Rake receiver are proposed and verified by simulation and experiment on this system. The results indicate that the improved synchronization algorithm has better performance in accuracy and the 2D-Rake receiver can provide 3 dB of gain in SNR.

郑斯辉, 陈翔. 基于USRP的DBO-CSS系统研究与实现[J]. 太赫兹科学与电子信息学报, 2018, 16(6): 1027. ZHENG Sihui, CHEN Xiang. Research and implementation of DBO-CSS system based on USRP[J]. Journal of terahertz science and electronic information technology, 2018, 16(6): 1027.

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