halfinterp.m

来自「包含软件无线电、dds、滤波器设计、数字调制解调等常用无线通信设计的matlab」· M 代码 · 共 10 行

function out = halfinterp(n,fp,l,x)
b = firhalfband(n,fp,'dev');%firhalfband(n,fp);   %半带滤波器系数
hf = mfilt.firinterp(l,b);     %使用半带滤波器设计一个多相插值滤波器
x_real = real(x);
x_imag = imag(x);
out_real = filter(hf,x_real); %实部和虚部分开滤波
out_imag = filter(hf,x_imag);
outt = (double(out_real) + j*double(out_imag));
out=outt*sqrt(var(x)/var(outt));  %使得输入和输出的功率相同以便比较