一种面向短时突发信号的高精度同步方案设计

针对短时突发通信存在捕获时间长、算法复杂度高、资源开销大等问题,文中设计了一种高精度同步方案。该方案自定义收发双方帧结构,采用独特码差分匹配算法实现信号检测和帧同步,并采用基于导频累积量的前向估计算法实现频偏估计和校正。为兼顾频偏估计精度和算法复杂度,对独特码采用滑动相关算法实现初始相位捕获,使系统结构紧凑,更加适合FPGA硬件实现。理论分析和软件仿真表明,该方案在低信噪比和高动态范围条件下具有较好的接收性能,频率估计精度能够达到符号速率的万分之一。文中同时进行了硬件协同仿真与验证,并给出了相应的仿真波形。

A High-Precision Synchronization Scheme Design for Short-Term Burst Signals

In view of the problems of long acquisition time, high algorithm complexity and high resource overhead in short-term burst communication, a high-precision synchronization scheme is designed. The scheme customizes the frame structure, uses differential matching algorithm of the unique code to achieve signal detection and frame synchronization, and adopts forward estimation algorithm based on pilot sequence to achieve frequency offset estimation. In order to take into account the accuracy of frequency offset estimation and the algorithm complexity, a sliding correlation algorithm is applied for the unique code to achieve initial phase capture, which makes the system compact and more suitable for FPGA hardware implementation. Theoretical analysis and simulation experiments show that the scheme has better receiving performance under the conditions of low signal-to-noise ratio and high dynamic range. The frequency synchronization accuracy can reach one ten thousandth of the symbol rate. Hardware co-simulation and verification are carried out, and the corresponding simulation waveforms are provided in the present study.