How to create a cosine filter ?

Question

Nasser Dav 2013-11-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/105985-how-to-create-a-cosine-filter

评论： Yingyu 2014-1-27

i treid to use this code

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')

but the matlab result is

??? Undefined variable "comm" or class
"comm.RaisedCosineTransmitFilter".

I hope that my question is clear ,thanks :) >>

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Answer 1

Wayne King 2013-11-13

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https://ww2.mathworks.cn/matlabcentral/answers/105985-how-to-create-a-cosine-filter#answer_115099

Do you have the Communication System Toolbox installed?

That functionality ships with that toolbox.

The Signal Processing Toolbox has functions for raised cosine filtering: rcosdesign()

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Nasser Dav 2013-11-13

no, can i download it from the web ?

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Answer 2

Ken 2014-1-10

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https://ww2.mathworks.cn/matlabcentral/answers/105985-how-to-create-a-cosine-filter#answer_120563

I have a similar problem. Can someone tell us how to fix this. I have othe comm. functions in my package. More so, I have this RaisedCosine filter in my Simulink package, and it works perfectly.

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Yingyu 2014-1-27

Exactly, I also have the same problem. I have used >>ver to double confirm that I have the Signal Processing Toolbox. However when I typed the commands like what Nasser Dav did, I received the same error. =(

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