Hi, the size of the input argument is equal to the size of number of samples to be simulated by the "comm.RicianChannel" object. The output of the "comm.RicianChannel" object contains two arguments, the "output signals" and the "pathgains". The size of the "output signals" is the same as that of the input argument since the number of samples(
) remain same throughout the fading.
) remain same throughout the fading. However, the size of the "pathgains" is a 
matrix where 
is the number of discrete path delays. You are correct in stating that the conv result will result in path delays. The path delays are captured in the "pathgains" output argument whose size is not equal to the size of input argument (
).
matrix where is the number of discrete path delays. You are correct in stating that the conv result will result in path delays. The path delays are captured in the "pathgains" output argument whose size is not equal to the size of input argument (). To read more about the output arguments, you can refer to this documentation: https://www.mathworks.com/help/comm/ref/comm.ricianchannel-system-object.html#:~:text=%7C%20nonnegative%20scalar-,Output%20Arguments,-expand%20all
