摘要
针对高速移动通信系统大多普勒频偏和导频资源受限条件下的载频同步问题,提出了一种级联递进载波同步方法。首先利用数据帧首尾导频块估计与校正接收信号多普勒频率变化率;然后设计了基于多级自相关运算的高精度多普勒频偏估计模型;最后采用三阶锁相环跟踪剩余的多普勒变化率和频率偏移。仿真结果表明,该方法多普勒频率变化率校正满足载波同步需求,具有较高的多普勒频偏估计精度和较低的解调误码率。
For the carrier frequency synchronization problem in high-speed mobile communication systems with large Doppler frequency offset and limited pilot resources,a cascade progressive carrier synchronization method is proposed.Firstly,the Doppler frequency change rate of the received signal is estimated and corrected by using the head and tail pilot blocks of the data frame.And then,a high-precision Doppler frequency offset estimation model based on multi-level autocorrelation is designed.Finally,the third-order PLL is used to track the remaining Doppler change rate and frequency offset.Simulation results show that the proposed method can meet the requirements of carrier synchronization,and has high Doppler frequency offset estimation accuracy and low demodulation bit error rate.
作者
孙婷
SUN Ting(Shaanxi Post and Telecommunication College,Xianyang 712000,Shaanxi Province,China)
出处
《信息技术》
2021年第1期142-146,共5页
Information Technology
关键词
高速移动通信
载波同步
多普勒频偏
自相关
high-speed mobile communication
carrier synchronization
Doppler frequency offset
autocorrelation
