MATLAB: How to specify AWGN block in SIMULINK

awgnsimulink

How can I estimate the parameters of AWGN block for OFDM system

with data samples = 52

64 subcarrier

cyclic prefix=16

nuber of guard band = 6+5=11

and 1 bit DC null

Best Answer

You can specify “Number of bits per symbol” and “symbol period” as you mentioned above by having M, Fs variables in MATLAB workspace.

You can refer to the below documentation link for more information on “AWGN Channel” block

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

Related Solutions

MATLAB: SNR in AWGN

With the syntax

    y = awgn(x,snr);

You generate a white noise vector with a variance of

   variance = 10^(-snr/10);
   noise = sqrt(variance)*randn(size(x));

If you use 'measured', then awgn actually measures the signal power.

For example:

x = cos(pi/4*(0:99));
y = awgn(x,5,'measured');

In this case the variance of the additive white noise is:

    sigp = 10*log10(norm(x,2)^2/numel(x));
    snr = sigp-5;
    noisep = 10^(snr/10);
    noise = sqrt(noisep)*randn(size(x));

MATLAB: Error in command awgn

There is a file named awgn.m in this directory

C:\Users\Admin\Documents\MATLAB

that precedes MATLAB's awgn.m function on your path.

When you enter:

>>which awgn

you should see something like:

toolbox\comm\comm\awgn.m

You need to either remove the directory: C:\Users\Admin\Documents\MATLAB

from your path with

rmpath('C:\Users\Admin\Documents\MATLAB');

or if you need other files in that directory, move awgn.m out of there. Delete it, or copy it to a directory not on the MATLAB path. Enter

>>path

to see everything on the MATLAB path. The "bad" awgn.m is a script and you are tyring to call MATLAB's awgn.m, but because the other path comes first, MATLAB tries to use the script like a function.

Best Answer

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MATLAB: SNR in AWGN

MATLAB: Error in command awgn

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