I want to get only the impulse response of the following channel with characteristics :
P=[0 -10 -20 -25]; power in each tap in dB
K=[4 1 0 0]; Ricean K-faztor 
tau=[0 0.5 0.8 0.9]; tap delay in microsecond
Dop=[0.4 0.4 0.5 0.3]; Doppler maximal frequency paprameter in Hz
 
I try to use the following command in matlab but I can not get the impulse response:
 
CHAN = RICIANCHAN(Ts, FD, K, tau, p)