自适应滤波器的FPGA硬件实现  

Hardware Implementation of Adaptive Filter Based on FPGA

作　　者：刘燕[1] 肖庆高[1] 张健[1] 徐文祥 LIU Yan;XIAO Qinggao;ZHANG Jian;XU Wenxiang(College of Information Engineering,Northwestern Polytechnical University Ming De College,Xi'an 710124,China)

机构地区：[1]西北工业大学明德学院信息工程学院,西安710124

出　　处：《微处理机》2024年第4期51-54,共4页Microprocessors

摘　　要：采用LMS算法和FIR框架结构,对一种基于FPGA硬件的自适应滤波器系统的实现方法展开探讨。系统采用自顶向下的模块化方案设计16阶自适应滤波器。顶层文件包含两个接口、FIR滤波、误差计量和抽头系数共5个模块。系统参数前期均由MATLAB仿真验证选取最优值。硬件测试平台选用以ZYNQ-7000系列芯片为核心的开发板。加噪正弦波信号经系统滤波处理后通过示波器观测,显示去噪效果良好,且通过逻辑分析仪抓取的结果与MATLAB理论仿真结果符合度较好。系统可以封装成一个自适应反复调用的功放IP核,适用于音频、图像、视频等信号滤波处理领域,具有一定的工程应用价值。Using LMS algorithm and FIR frame structure,the implementation method of an adaptive filter system based on FPGA hardware is discussed.The system adopts a top-down modular scheme to design a 16th-order adaptive filter.The top-level file contains five modules:two interfaces,FIR filtering,error measurement and tap coefficient.The system parameters are all verified by MATLAB simulation in the early stage,and the optimal values are selected.The development board with ZYNQ-7000 series chip as the core is selected for the hardware test platform.The noisy sine wave signal is observed by oscilloscope after being filtered by the system,which shows that the denoising effect is good,and the results captured by logic analyzer are in good agreement with the theoretical simulation results from MATLAB.The system can be encapsulated into an adaptive IP core of power amplifier,which is suitable for audio,image,video and other signal filtering processing fields and has certain engineering application value.

关 键 词：LMS算法 自适应滤波器 有限脉冲响应 FPGA器件 IP核 

分 类 号：TN791[电子电信—电路与系统]