Gardner算法实现基带信号位同步技术探讨

Discussion on Implementation of Baseband Signal Synchronization Techniques of Gardner Algorithm

利用Gardner算法实现基带信号位同步,能比较好地解决基带信号频率与本地时钟频率不同步的问题。系统位同步环路由插值器,TED误差检测器,环路滤波器和控制器组成,利用对经本地时钟采样后的基带信号内插产生的误差信号经TED,环路滤波传送到控制器,再从NCO提取误差控制参数反馈到内插器,不仅可以计算出最佳插值位置,也可以得到具体最佳值的大小。实际验证该系统具有良好的性能,且结构简单,易于实现,适用于高速数字接收机的调制解调系统。

The application of Gardner algorithm to the problem of the bit synchronization for the baseband signal would be a good solution to solve the baseband signal frequency inconsistent with the local clock frequency. The bit synchronization loop consist of interpolator,error detector,loop iflter and controller. The error signal generated by interpolating to the baseband signal which have be sampled by the local clock frequency get through the error detector and the loop iflter to the controller,then extract error control parameters to interpolator. The system may get the best interpolation position and the optimal value. The actual veriifcation shows the system has good performance and the structure is easy to implement. It can be used in Modulation and demodulation system of high-speed digital receiver.