基于同PCI小区导频信号互扰实现的LTE信号屏蔽系统  

LTE Signal Shielding System Based on Mutual Interference of Cell-Specific Reference Signals with Same PCI

作　　者：龙杰锋 余洋 杨美刚 何仁伦[1] LONG Jiefeng;YU Yang;YANG Meigang;HE Renlun(Southwest China Research Institute of Electronic Equipment,Chengdu 610036,China;China Electronics Technology Group Corporation Rongwei Electronic Technology Co.,Ltd,Chengdu 610036,China)

机构地区：[1]中国电子科技集团公司第二十九研究所,成都610036 [2]中电科蓉威电子技术有限公司,成都610036

出　　处：《电子信息对抗技术》2023年第3期46-51,共6页Electronic Information Warfare Technology

摘　　要：针对传统压制式干扰仪对宽带长期演进(Long Term Evolution,LTE)信号干扰效果不理想,以及伪基站类干扰实现复杂的问题,基于通用软件无线电外设(Universal Software Radio Peripheral,USRP)设计并实现了一套LTE信号屏蔽系统。该系统利用LTE系统中同物理层小区标识(Physical-layer Cell Identity,PCI)小区会产生严重同频干扰的特点,通过构建与屏蔽区域服务小区具有相同PCI的LTE小区,发射主同步信号(Primary Synchronization Signal,PSS)、辅同步信号(Second Synchronization Signal,SSS)、公共参考信号(Cell-specific Reference Signal,CRS)、广播信号和系统消息,使服务小区的信号与干扰加噪声比(Signal to Interference plus Noise Ratio,SINR)严重恶化,终端业务中断甚至掉线,从而达成屏蔽效果。该屏蔽系统包括扫频和信号接收单元、获取PCI单元、屏蔽信号生成单元以及屏蔽信号发送单元四个部分。实验测试表明,在天线增益不小于15 dBi、屏蔽区域所在公网服务小区的参考信号接收功率(Reference Signal Receiving Power,RSRP)不大于-63 dBm时,该设备能有效管控半径为10 m范围的LTE信号。The interference effect of traditional suppression jammer on broadband long term evolution(LTE)signal is not ideal.The implementation of pseudo base station interference is complex.A LTE signal shielding system is designed and implemented based on universal software radio peripheral(USRP).Advantage of the fact that the physical layer cell identity(PCI)cell in the LTE system will generate serious co-frequency interference is taken.By constructing an LTE cell with the same PCI as the service cell in the shielded area,transmitting primary synchronization signal(PSS),second synchronization signal(SSS),cell-specific reference signal(CRS),master information block(MIB)and system information block(SIB),the signal to interference plus noise ratio(SINR)of the service cell is seriously deteriorated,and the terminal service is interrupted or even dropped.The shielding effect is achieved.The shielding system includes four parts:frequency sweeping and signal receiving unit,acquiring PCI unit,shielding signal generating unit and shielding signal transmitting unit.Experimental tests show that when the antenna gain is not less than 15 dBi and the reference signal receiving power(RSRP)of the public network service cell where the shielded area is located is not more than-63 dBm,the equipment can effectively control LTE signals with a radius of 10 m.

关 键 词：LTE PCI 同频干扰 信号屏蔽 USRP 

分 类 号：TN978[电子电信—信号与信息处理] TN929.5[电子电信—信息与通信工程]