Why I am getting error while using qammod function ?

Hi

I am using matlab R2014a and I using the code below :

%% Simulation Parameters
numBits = 20000;
modOrder = 16;
%% Creat a source signal and apply 16-QAM modulation 
srcBits = randi([0 1],numBits,1);
modOut = qammod(srcBits,modOrder,'InputType','Bit','UnitAveragePower',true);
%% Apply AWGN
SNR = 15;
chanOut = awgn(modOut,SNR);
scatterplot(chanOut)

%% Demodulate received signal 
demodOut = qamdemod(chanOut,modOrder,'OutputType','Bit','UnitAveragePower',true);

I should have got the figuer above. But I am having the following error instead !

( Note : I run this code while typing my question and got the result above )

Error using qammod (line 28)

Too many input arguments.

and line 28 is found here :

27 - if(nargin>4)

28 - error(message('comm:qammod:numarg2'));

29 - end

thank you

[Walter Roberson]

You should double-check your help documentation.

I suspect that back in R2014a that there was no support for 'UnitAveragePower'

[majdi Khlfalla]

@Walter Roberson yes, I did some research and found that problem was my matlab version. And instead of averaging power, I have to noramlize it in separate step. Thank you walter for your help

Answer 1

[Saurabh]

Hi @majdi Khlfalla,

I've encountered a similar issue in the past, and I was able to resolve it by upgrading my MATLAB version to R2016a or later.

I Hope this helps

[majdi Khlfalla]

@Saurabh Yeah, the problem was in my matlab version, I should upgrade now. many thanks