采用窗函数法进行数字信号截短的优化算法  

Optimization algorithm for digital signals intercept with window function method

作　　者：周冬跃[1] 林海全 张洪林[3] 李学识[4] 黄继才[1] 

机构地区：[1]广东工业大学物理与光电工程学院,广东广州510006 [2]广州致远电子股份有限公司,广东广州510660 [3]华南理工大学电子与信息学院,广东广州510641 [4]广东工业大学自动化学院,广东广州510006

出　　处：《电子技术应用》2015年第12期32-35,共4页Application of Electronic Technique

基　　金：国家自然科学基金(61505035)

摘　　要：对数字信号进行有限点数的截短采样时，通常会发生频谱泄露。提出一种基于FPGA的矩形窗、海明窗、汉宁窗和布莱克曼窗四个窗函数的改进型信号截短算法方案，并对其资源消耗和运行速度进行优化，从而提高频谱泄露的性能。为了减少系统资源消耗和提高精度，采用了资源共享技术、选择合理的数据位宽以及为CORDIC模块选择合适的迭代次数；为了优化速度，采用了恰当的流水线技术，从而较大提高了处理速度。仿真表明，优化后的系统逻辑资源减少20％～51％，时序约束达到360MHz，其中的布莱克曼窗对第一级旁瓣衰减达到59．3dB。Spectrum leakage usually occurs when signal-cutting digital signals. Window function can improve the spectral leakage characteristics of the signal-cutting signals. The improved scheme of window function is proposed about rectangular Window, Ham- ming Window, Hanning Window and Blackman Window based on FPGA. The four window functions are designed to optimize their resources comsume and running speed, thereby improving the performance of spectrum leakage. This method use a resource sharing technology, a reasonable choice of data widths and choose a suitable number of iterations for CORDIC module. In order to optimize the speed use the appropriate pipeline technology, which greatly improve the process speed performance. The simulation shows that the proposed optimization system works properly, and 20%～51% of logic resources of system decreases. Timing constraint in systems reached 360 MHz. The signal attenuation the first stage of Blackman window reached 59.3 dB.

关 键 词：窗函数 信号截短 频谱泄露 优化算法 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]