Communications Toolbox

White Gaussian Noise

The wgn function generates random matrices using a white Gaussian noise distribution. You specify the power of the noise in either dBW (decibels relative to a watt), dBm, or linear units. You can generate either real or complex noise.

For example, the command below generates a column vector of length 50 containing real white Gaussian noise whose power is 2 dBW. The function assumes that the load impedance is 1 ohm.

y1 = wgn(50,1,2);

To generate complex white Gaussian noise whose power is 2 Watts, across a load of 60 ohms, use either of the commands below. Notice that the ordering of the string inputs does not matter.

y2 = wgn(50,1,2,60,'complex','linear');
y3 = wgn(50,1,2,60,'linear','complex');

To send a signal through an additive white Gaussian noise channel, use the awgn function. See AWGN Channel for more information.

Signal Sources

Random Symbols

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