hi everybody,
i'm trying to generate an etsi filter in order to simulate a channel. I
did it but there is still one problem, i don't manage to take in account
taps delays..
I read on the net we have to use the power delay profile of the filter but
i'm not able to manage to coding of this method.
I found a matlab script, can you tell me what do you think about: I don't
understand the aim of this script.
thanks
>%calcul du profil de puiss qui fait intervenir les delais des coeffs
>fe = 10;
>tau_max = 390e-9;
>tau_rms = 50e-9;
>t = 0:1/fe:tau_max;
>PP = exp(-(t/tau_rms)); %cf. article : "channel and interference
mode..."
>%normalisation :
>PP = PP/norm(PP);
i tried also this one:
>fe = 10;
>
>mat_taps = zeros(size(tau,2),2);
>%la premi�re colonne de mat_taps correspond aux d�lais
>%la deuxi�me colonne correspond � la puissance relative en dB
>mat_taps(:,1) = tau.';
>mat_taps(:,2) = P.';%d�j� en lin�aire
>nb_taps = size(mat_taps,1);
>
>%Transform�e de Fourier (approximation) :
>vect_deltas = zeros(nb_taps,1);
>vect_deltas(1:nb_taps-1) =