How can I insert awgn noise in the eeg signal?

I have downloaded a file of .mat type and imported it in matlab, now I want to add noise in that eeg signal.

>fs = 512
  >T = 1/fs; % sampling rate or frequency;
  >N =length(EEGsig);
  >ls = size(EEGsig); % find the length of the data per second
  >tx =[0:length(EEGsig)-1]/fs;
  >fx = fs*(0:N/2-1)/N;
  >figure; subplot (211), plot(tx,EEGsig); xlabel('Time (s)'), 
  >ylabel('Amplitude (uV)'), title('Original EEG signal');  %EEG waveform
  >subplot(212), plot(tx,EEGsig);
  >xlabel('Time (s)'), ylabel('Amplitude (uV)'), title('Zoom into original EEG 
  signal at 1 to 2 seconds'), xlim([1,2]) ; % Used to zoom in on single ECG 
  waveformfigure

Answer 1

[KSSV]

Read about awgn. There you got demo on how to add white Gaussian noise to given signal.

https://in.mathworks.com/help/comm/ref/awgn.html

[Aparna Gupta]

Thank you @KSSV for replying to my question..I have already referred to the link you have just mentioned.I need to add noise to the EEG signal which i am finding difficult.I tried adding noise to the sine wave and i was successful but m unable to add noise to the eeg signal which i have already generated in matlab according to the above mentioned code.

Answer 2

[S Buvanesh Bharathwaj]

hi @Aparna Gupta. i want to know how did u generate the eeg signal.....i am a final year student and i have very short time to complete my project... kindly help me to finish my project. i want to know how to generate eeg signal... how to add noise to it and how to design filter for that signal. so far what i did is i downloaded eeg data set sample from physio.net and did some processing using eeglab(with referenc ton eeglab tutorial).....please do help me .... i have to submit the report in a week