TD-LTE上行侦收中物理共享信道用户码流的恢复

User Bit Stream Recovery in Physical Shared Channel for TD-LTE Uplink Reconnaissance

在TD-LTE上行链路侦收中对用户信号进行非合作解调、获取其传输码流是后续用户特征信息分析的重要前提,同时也是实施移动通信终端精准管控的必要条件。针对这一需求,基于TD-LTE上下行帧结构时域特征之间的对应关系,通过下行侦察引导来获得上行定时粗同步,然后利用相位差值序列的频域线性相位特征来实现解调参考信号基序列的识别与定时精同步。在利用解调参考信号进行侦察信道估计与补偿之后,通过频域数据的傅里叶逆变换最终恢复出上行物理共享信道中DFT扩展的OFDM信号的调制星座图,从而得到用户传输码流。采集实际TD-LTE信号作为试验对象成功恢复出用户码流,验证了上述方法的有效性与实用性,为后续TD-LTE移动终端管控设备的研制提供了参考。

The non-cooperative demodulation to recover user bit stream for TD-LTE uplink re- is an important prerequisite for user characteristic information analysis. It is also a necessary condition for the implementation of precise control on mobile communication equip- ments. For this demand, based on the time domain features correspondence of the frame struc- ture between up and down link of TD-LTE, the coarse timing synchronization for uplink is a- chieved by downlink reconnaissance and guidance. The linear phase feature of the differential phase sequence in frequency domain is used reference signal and acquire precise timing compensation by the demodulation reference to identify the basic sequence of the demodulation synchronization. After the channel estimation and signal nally recovered by Fourier inverse transform to the , the modulation constellation of uplink is fi- DFF-S-OFDM sigual in PUSCH （Physical Uplink Shared Channel） and the user bit stream is obtained. The actual TD-LTE signals are in- tercepted in the experiment to recover the user bit stream successfully, and it verifies the effec- tiveness and practicability of the above method. It is an important reference for TD-LTE terminal control equipment development.