基于有符号数乘法器优化设计的自适应陷波器FPGA实现  

FPGA Implementation of Adaptive Notch Filter Based on Optimized Design of Signed Multiplier

作　　者：赵中华[1] 冯桂义 邓德迎[1] Zhao Zhonghua;Feng Guiyi;Deng Deying(School of information and Communication,Guilin University of Electronic Technology,Guilin 541004,Guangxi,China)

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《梧州学院学报》2023年第4期40-49,共10页Journal of Wuzhou University

基　　金：国家自然科学基金联合基金重点项目(U22A2054);广西创新驱动发展专项项目(桂科AA18242030)。

摘　　要：自适应滤波器因其具有能跟踪未知信号特性并自动调整到最佳的滤波效果而被广泛应用于诸多领域,如噪声消除、智能天线阵、音视频处理等。针对自适应滤波器实时性和运算速度等要求,FPGA成为自适应滤波器硬件实现的主流平台之一。由于系统愈加复杂,FPGA的片上资源也显得弥足珍贵。对于FPGA自适应滤波器而言,资源的大量消耗主要来自于乘法运算量,因此在设计中达到相同的滤波效果时降低乘法资源的消耗是关键。该研究基于EP4CE15F17C8的FPGA平台,采用模块化和并行式的设计思路,基于符号LMS算法自行设计了有符号数阵列乘法器,在有限硬件资源的条件下实现同等滤波效果的自适应陷波器设计。试验结果表明:以滤除工频干扰为例,硬件平台能有效恢复目标信号,与目前流行的自适应陷波器对比,所需乘法器资源减少7%。The Adaptive filter is widely used in various fields such as noise cancellation,smart antenna array and audio and video processing,because it has the characteristics of being capable of tracking unknown signals and it can automatically adjust itself to achieve optimal filtering effects.To meet the requirements of real-time performance and computational speed of adaptive filters,FPGA has become one of the mainstream platforms for their hardware implementation.As the system becomes more complex,on-chip resources of FPGA are increasingly valuable.For FPGA adaptive filters,a large amount of resource consumption comes from multiplication operations.Therefore,reducing the consumption of multiplier resources while achieving the same filtering effect is key in the design process.The present study is based on the FPGA platform EP4CE15F17C8,using modular and parallel design ideas,and independently designs a signed array multiplier based on the symbol LMS algorithm.Under the condition of limited hardware resources,an adaptive notch filter design with the same filtering effect is achieved.Result of the experiment shows that,for example,in filtering out power frequency interference,the hardware platform can effectively recover the target signal,and compared with the currently popular adaptive notch filters,the required multiplication resource consumption is reduced by 7%.

关 键 词：自适应滤波器 乘法器 FPGA LMS算法 

分 类 号：TP303[自动化与计算机技术—计算机系统结构] TP391[自动化与计算机技术—计算机科学与技术]