Undefined variable "comm" or class "comm.Rais​edCosineTr​ansmitFilt​er".

2014 1 27
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更新时间：2017 7 23
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Hi, I am just trying the codes to design a raised cosine filter. There are already codes found in the web http://www.mathworks.com/help/comm/examples/raised-cosine-filtering.html. And what I did what just copy and paste the codes there onto my command window to try out. Below are the codes:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Nsym = 6; % Filter span in symbol durations
beta = 0.5; % Roll-off factor
sampsPerSym = 8; % Upsampling factor
rcosFlt = comm.RaisedCosineTransmitFilter(...
'Shape', 'Normal', ...
'RolloffFactor', beta, ...
'FilterSpanInSymbols', Nsym, ...
'OutputSamplesPerSymbol', sampsPerSym)
% Visualize the impulse response
fvtool(rcosFlt, 'Analysis', 'impulse')
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
I expect it to work, however I am given an error "Undefined variable "comm" or class "comm.RaisedCosineTransmitFilter"."
I have the Signal Processing Toolbox, and even when I tried the above codes in my school computer it also throws out the same error.
As such, I tried to design the raised cosine filter using the function rcosdesign(), again I copied the codes from the example and simply paste it in the command window. Again it throws out the error undefined function 'rcosdesign' for input arguments type double. =(
Can someone help me please.
Thanks.

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Ken
Ken 2014-3-2
编辑：Ken 2014-3-2
Hi Yingyu,
Kindly let us know what you did to fix the error "Undefined variable "comm" or class "comm.RaisedCosineTransmitFilter""
I am also facing a similar issue with the "comm.AGC" command. I use Matlab R2012b
K

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Honglei Chen
Honglei Chen 2014-3-3
编辑：Honglei Chen 2017-6-14

0 个投票

You need Communications System Toolbox license to use comm.RaisedCosineTransmitFilter. You can use
>> ver
to see if you have that toolbox installed.
HTH

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Honglei Chen
Honglei Chen 2017-6-14
If you look at the bottom of the reference page
https://www.mathworks.com/help/comm/ref/comm.raisedcosinetransmitfilter-class.html
It says the feature is introduced in R2013b

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kamal
kamal 2017-6-14

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i m having 2010, i checked >>ver it shows communication toolbox. but still i get :: Undefined variable "comm" or class "comm.TurboEncoder"
Kindly give solution

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