"Undefined function 'times' for input arguments of type 'channel.rician'" error on MATLAB, how to fix it?

When i run the following code, i have an error, what is the problem? Here is the code:

    clear all; close all; clc;
% basic inputs =============================
fc=2e9;     % Hz  Carrier frequency
F=16;        % sampling rate: fraction of wave length
V=10;        %  m/s MS1 speed 
NFFT=128;    % Number of points in FFT
Nsamples=100; % Number of samples
% geometry inputs ===========================
dBS=1000;     % distance of BS to origin
alpha = 180;   % degree. Angle of BS-MS with MS route 
% inidirect gemeotric parameters ================
BSx=dBS*cosd(alpha);  % loc of BS x-coord
BSy=dBS*sind(alpha);  % loc of BS y-coord
% indirect parameters ===========================
c=3e8;
lambdac=c/fc;        % m wavelength
Dx=lambdac/F;      % m sampling spacing
ts=Dx/V;                % s time sampling interval
fs=1/ts;                   % Hz sampling frequency
kc=2*pi/lambdac;   % propagation constant
timeaxis=ts.*[0:Nsamples];     % s  elapsed time axis
disaxis=Dx.*[0:Nsamples];      % n  traveled distance axis 
MSx=V.*timeaxis;    % MS route sampling points
% radio path length============================== 
distBSMS=sqrt((BSx-MSx).^2+(BSy).^2);
% complex envelope: amplitude and phase ===============
rx=1*exp(-1j*kc.*distBSMS)-exp(-1j*2*pi/(c./5e9).*distBSMS);
c1 = ricianchan;
r=c1.*rx;
% complex envelope spectrum   ======================
spectrumr=fftshift((abs(fft(r,NFFT))).^2);
freqaxis=[0:NFFT-1]*fs/NFFT-fs/2;
% Plots =====================================
figure,plot(timeaxis,abs(r))
xlabel('Time (s)') ;

And this is the error:

    Undefined function 'times' for input arguments of type 'channel.rician'

Answer 1

[Walter Roberson]

You cannot multiply a channel model by a value. You can use the channel model to generate samples and multiply the samples.

[Deema42]

what do you mean by generating samples? can you give me an example please?

[Walter Roberson]

Sorry, I mistook it for being one of the random noise channels.

You have to use the ricianchan object to filter samples; you can then multiply the filtered samples.

Depending on your purpose in doing the multiplication, you might consider instead changing the AvgPathGaindB property of the channel.

https://www.mathworks.com/help/comm/ref/ricianchan.html

Answer 2

[Honglei Chen]

You don't want to multiply the channel with the signal. Instead, you want to filter the signal with the channel, like the following:

r = filter(c1,rx)

HTH