【摘要】 传统CIC滤波器用作抽取和内插抗混叠滤波器时其通带偏差和混叠镜像衰减通常不能满足软件无线电系统的要求,为此提出了一种用内插二阶多项式级联锐化CIC滤波器的改进方法,它能同时使通带和阻带的性能得以提高.数值仿真结果表明,所提出的这种新型抽插抗混叠CIC滤波器能够有效补偿通带的偏差,同时又能增加旁瓣部分的衰减,更适合应用于对宽带信号处理的软件无线电数字上下变频器中.更多还原

【Abstract】 The bias of passband and aliasing-imaging attenuation of the conventional Cascaded Integrator-Comb(CIC) filter,which is used as anti-aliasing filter for decimating and interpolating,always can’t come up to the requirement of software radio system,in order to deal with this problem,a improved method with Sharpened CIC filter cascading Interpolated Second-Order Polynomials(ISOP) has been proposed,it can enhance the performance both in passband and in stopband.The numerical value simulation results show that the new approach not only compensates the droop in the passband,but also enlarges the attenuation in aliasing-band,and is more desirable for the wide band signal processing in digital up-down converter of software radio.更多还原