摘要
LTE小区物理层ID是对移动通信系统实施监测、管控与利用中的关键信息。以TD-LTE下行链路为目标对象,在对其信号模型与物理层ID计算要求简要介绍之后,充分利用TD-LTE信号规整的时频结构特性,基于时域多重脉冲特征实现了子帧划分与符号粗同步,基于辅同步信号频域特征并结合LTE应用边界条件实现了载波中心频率的精确估计。在此基础上利用辅同步信号的BPSK调制特点实现了符号的精同步,通过辅同步信号的解调比对及主同步信号相位序列比对获取了小区组号和扇区号,从而计算得到小区物理层ID。上述方法的有效性经过了实采信号的试验验证,具有简洁快速的特点,适合于TD-LTE信号侦收的工程应用。
The cell physical ID in LTE is the key information in the mobile communication system monitoring,control and utilization. The TD-LTE downlink is the main object in this paper. The signal model and physical ID calculation requirement are introduced briefly,and the time-frequency structure characteristics of TD-LTE signals are fully utilized. The frame division and symbol coarse synchronization are realized based on the multi hiberarchy pulse characteristics in time domain. Based on the frequency domain characteristics of SSS（ Secondary Synchronization Signal） and the LTE application boundary conditions,the accurate estimation of carrier center frequency is realized. On the basis of this,the fine synchronization of symbols is realized by using the BPSK modulation characteristics of SSS. Then,the cell group number and sector number are obtained by the demodulation of SSS and comparing of PSS（ Primary Synchronization Signal） phase sequence. Finally the cell physical ID is calculated. The validity of above method is proved by the experiment for real TD-LTE signals. It has the characteristics of simplicity and speed,and it is suitable for the engineering application of TD-LTE signal reconnaissance.
出处
《电子信息对抗技术》
2017年第6期48-53,86,共7页
Electronic Information Warfare Technology
关键词
TD-LTE信号侦收
时域多重脉冲特征
小区物理层ID
主同步信号
辅同步信号
小区特定参考信号
TD-LTE signal reconnaissance
multi hiberarchy pulse characteristics in time do-main
cell physical ID
primary synchronization signal
secondary synchronization signal
cell ref-erence signal
