User`s guide

Random Source
5-359
Variance parameters generates an N-channel output (M-by-N frame matrix)
containing a distinct random distribution in each column. When only one of
these parameters is specified as a vector, the other is scalar expanded to the
same length.
Output Data Type
The block’s output can be either real or complex, as selected by the Real and
Complex options in the Output complexity parameter. (These settings
control all channels of the output, so real and complex data cannot be combined
in the same output.) For complex output with a
Uniform distribution, the real
and imaginary components in each channel are both drawn from the same
uniform random distribution, defined by the
Minimum and Maximum
parameters for that channel.
For complex output with a
Gaussian distribution, the real and imaginary
components in each channel are drawn from normal distributions with
different means. In this case, the
Mean parameter for each channel should
specify a complex value; the real component of the
Mean parameter specifies
the mean of the real components in the channel, while the imaginary
component specifies the mean of the imaginary components in the channel. If
either the real or imaginary component is omitted from the
Mean parameter,
a default value of 0 is used for the mean of that component.
For example, a
Mean parameter setting of [5+2i 0.5 3i] generates a
three-channel output with the following means.
For complex output, the
Variance parameter, σ
2
, specifies the total variance
for each output channel. This is the sum of the variances of the real and
imaginary components in that channel.
Channel 1 mean real =5 imaginary =2
Channel 2 mean real =0.5 imaginary =0
Channel 3 mean real =0 imaginary =3
σ
2
σ
Re
2
σ
Im
2
+=