采用通信侦察方法实现5G-NR下行同步与广播信息获取的研究

Realization of 5G-NR Downlink Synchronization and Broadcast Information Acquisition by Communication Reconnaissance Method

对移动通信信号进行侦收与监控,不仅是维护正常移动通信秩序的重要保障,而且也是确保电磁空间安全的必要手段。针对5G移动通信新空口信号的时频域特点,利用电子对抗中的通信侦察方法,采用时域包络检波、时频特征综合判别、相位直线辅助解调等手段,快速实现了5G-NR下行同步与小区物理层ID的计算,在此基础上对PBCH物理广播信道传输的信号进行了解调解码,获取了主信息块的传输内容。最后利用通信侦察接收机实际采集5G-NR信号进行处理,验证了所用方法的有效性。不仅为后续5G信号监控应用中各种信道传输信号的分析处理奠定了重要基础,而且也为5G移动通信终端的信号处理新方法研究提供了重要参考。

The detection and monitoring on mobile communication signals are not only the important guarantee to maintain the normal order of mobile communication, but also the necessary means to ensure the safety in electromagnetic space. According to time-frequency domain characteristics of 5 G mobile communication new radio(NR) signal, the communication reconnaissance method in electronic countermeasure is used to realize 5 G NR downlink quick synchronization and calculation on the cell ID of physical layer by means of time-domain envelope detection, comprehensive recognition of time-frequency characteristics, and phase-line assisted demodulation. Then, the signals in PBCH physical broadcast channel are demodulated and decoded, and the transmission content in main information block is obtained. Finally, 5 G NR signals collected by the communication reconnaissance receiver are processed to verify the effectiveness of the method. It not only lays an important foundation for the transmission signal analysis and processing for various channels in subsequent 5 G signal monitoring applications, but also an important reference for the new signal processing research of 5 G mobile communication terminals.