TD-LTE下行链路侦收中广播信道传输信息的获取  

Transmitted Information Obtained About Broadcast Channel in TD-LTE Down Link Reconnaissance

作　　者：石荣 李潇 徐剑韬 SHI Rong;LI Xiao;XU Jian-tao(Science and Technology on Electronic Information Control Laboratory,Chengdu 610036,China)

机构地区：[1]电子信息控制重点实验室,成都610036

出　　处：《电子信息对抗技术》2018年第5期7-11,25,共6页Electronic Information Warfare Technology

摘　　要：在TD-LTE下行链路侦收中提取出广播信道传输的主信息块可获得目标小区的基本信息,传统方法是按照用户终端的一系列盲检测来实现的,复杂度高计算量大。针对此问题,充分利用电子侦察处理中信号整体时频分析的优势,并结合广播信道传输信号的特点,基于小区特定参考信号的时频分布特征直接判断天线端口数,并进行信道估计与补偿,从而解调出比特码流。在此基础上利用主信息块周期性重复传输与整体加扰的特点,只需一小段数据即可完成主信息块所含信息的提取。针对实际TD-LTE目标基站采集下行信号并实施处理,验证了上述方法的有效性,从而为TD-LTE下行链路侦收中后续的信息分析奠定了基础。The main information blocks transmitted in broadcast channel are extracted to obtain the basic information of target cells in TD-LTE downlink reconnaissance. The traditional method is implemented through a series of blind detection of user terminals,which is of high complexity and large computation. For this problem,the advantages of time-frequency analysis in reconnaissance processing are fully utilized,and the characteristics of transmitted signals in broadcast channel are combined. Based on the time-frequency distribution characteristic of the cell specific reference signal,the number of antenna ports is directly judged. Then the channel estimation and compensation are carried out,so that the bit stream can be recovered. Only a small amount of data may be used to extract the main information block by using the characteristics of periodic repeated transmission and whole scrambling. The downlink signal is collected and processed for the actual TD-LTE target base station,and the effectiveness of the above method is verified. It is an important basis for the following information analysis in TD-LTE downlink reconnaissance.

关 键 词：TD-LTE信号侦收 广播信道 主信息块 系统帧号 天线端口数 小区特定参考信号 空频分组码 加扰解扰 

分 类 号：TN971.1[电子电信—信号与信息处理]