rrcosf.m

802.15 dsss 物理协议层方针代码

function h=rrcosf(a,T,t)
% Root raise cosine filter
% Where T is input signal sample period
% a is rolloff factor 0<a<1
h=(4*a/pi/sqrt(T))*(cos((1+a)*pi*t/T)+(T./(4*a*t)).*sin((1-a)*pi*t/T))./(1-(4*a*t/T).^2);
H=fft(h,1024);
f=fs*(0:512)/1024;
plot(f,H(1:513));