How can i transmit a modulated signal through a AWGN channel which adds a zero mean gaussian real random number with variance s^2

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demos serghiou 2016-3-26

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https://ww2.mathworks.cn/matlabcentral/answers/275578-how-can-i-transmit-a-modulated-signal-through-a-awgn-channel-which-adds-a-zero-mean-gaussian-real-ra

评论： Vidya Viswanathan 2016-3-29

M = 4;
data=randi([0, M-1], 10000,1);
modData = pammod(data,M);
scatterplot(modData)
title('4-PAM');
snr=[0 2 4 6 8 10 12 15];
y=awgn(modData,snr);
scatterplot(y)

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John BG 2016-3-26

Simulink already has a block for AWGN channels where you can change the setting to your values of interest.

Vidya Viswanathan 2016-3-29

You could consider using "comm.AWGNChannel" System object. This provides you with a lot of options including one to specify the noise variance. Refer to the following documentation link for the same:

http://www.mathworks.com/help/comm/ref/comm.awgnchannel-class.html?s_tid=answers_rc2

As pointed out by John, the same is available in Simulink as well. The following link describes the block corresponding to AWGN channel: http://www.mathworks.com/help/comm/ref/awgnchannel.html

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