how to get the x-axis filtering same to the noisy?

cut_off=1.5e3/Fs/2;
order=16;
h=fir1(order,cut_off);
fh=fft(h,nfft2);
fh=fh(1:nfft2/2);
plot(xfft,abs(fh/max(fh)));
ylabel('AMPLITUDE');
title('Impulse Response Signal')

figure(1);
w=conv(L,h);
subplot(3,2,5);
plot(w,'b','linewidth', 2);
title('Filtering Arc Signal')
xlabel('TIME,t(us)')
ylabel('AMPLITUDE');