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

1 次查看（过去 30 天）
Deema42
Deema42 2017-1-8
回答： Honglei Chen 2017-1-9
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'

请先登录，再回答此问题。

回答（2 个）

Walter Roberson
Walter Roberson 2017-1-8
You cannot multiply a channel model by a value. You can use the channel model to generate samples and multiply the samples.
  2 个评论
Walter Roberson
Walter Roberson 2017-1-8
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

请先登录，再进行评论。

Honglei Chen
Honglei Chen 2017-1-9
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

类别

在 Help Center 和 File Exchange 中查找有关 Matched Filter and Ambiguity Function 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by