一种改进的NLMS自适应滤波器的FPGA实现

An Improved NLMS Adaptive Filter and Its Implementation Based on FPGA

针对当前广泛应用的自适应滤波器,提出了一种改进的变步长NLMS自适应算法,在不增加计算复杂度的条件下获得了更好的收敛速度。在硬件实现过程中,利用FPGA并行处理的特点,采用自上而下的设计方法和流水线设计技术,获得了较好的滤波效果和较快的处理速度,完全满足自适应信号处理领域中实时性的要求。

As the adaptive filters were widely used in many applications,a revised variable step size NLMS adaptive filter algorithm was proposed.The new NLMS algorithm had faster convergence speed than the standard LMS algorithm without more computing complexity.By taking the advantage of parallel processing of FPGA,better adaptive filtering performance and faster processing speed had been obtained during the implementation of the algorithm based on FPGA with the design method of top-down and pipelined technology.It could fully meet the realtime requirements of the adaptive filter processing.