摘要
比较了同步采样和异步采样条件下符号同步实现方法的不同,在全数字接收机中需要采用内插方法来实现符号同步,内插滤波器是一种线性时变滤波器,在工程中可以采用多项式内插函数来近似,采用FARROW结构实现。在此基础上介绍了内插法符号同步环路的结构,组成单元,其中详细介绍了内插控制器和定时误差检测器的原理。在AWGN信道中针对QAM64信号进行了仿真和实现,眼图和星座图恢复良好,该符号同步环路可以应用于侦察接收机的解调器中。
In traditional demodulator synchronization sampling is used.In all digital receiver based on the non-synchronization sampling timing recovery is achieved with the help of interpolator.Cubic interpolator,interpolation controller and Gardner Algoithm for symbol timing error detection are introduced in detail in this paper.The performance of the design is well in simulation.The design is implemented in XILINX FPGA and it can be applied to demodulation for reconnaissance receiver.
出处
《无线电通信技术》
2009年第6期53-55,共3页
Radio Communications Technology
关键词
全数字接收机
内插滤波器
符号同步
all digital receiver
interpolator
symbol synchronization
