基于定点DSP的复数求模值近似算法的实现  

Approximate calculation of complex modulus based on fixed-point DSP

作　　者：尹晗[1] 王占超[1] YIN Han;WANG Zhanchao(School of Electronic and Information Engineering,Beihang University, Beijing 100191,China)

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《太赫兹科学与电子信息学报》2016年第4期636-639,共4页Journal of Terahertz Science and Electronic Information Technology

摘　　要：工程应用中,定点数字信号处理器(DSP)因其可编程、速度快、功耗小、成本低等特点在数字系统中被广泛使用。但由于定点DSP数据动态范围小,在其上依定义计算复数的模值会带来"数据溢出"的问题。介绍了一种基于定点DSP的复数求模值近似算法。该算法以复数模值的工程近似计算方法为基础,对其进行优化并在定点DSP中进行算法实现。通过算法优化,可以在数据不溢出的前提下大幅提高复数求模的精确度。Fixed-point Digital Signal Processing(DSP) is widely used in the engineering applicationsbecause of its characteristics like high speed, low consumption, low cost and being programmable.However, the data dynamic range of fixed-point DSP is extremely narrow, which will cause “dataoverflow” when calculating the complex modulus according to its definition. An optimized method basedon the traditional approximate calculation of complex modulus is put forward and realized on thefixed-point DSP. It can greatly increase the accuracy of the calculation of complex modulus in theguarantee of no data overflow.

关 键 词：数字信号处理器 复数求模值 工程近似 

分 类 号：TN911.72[电子电信—通信与信息系统]