Advanced Channel Emulator
dBm
Operations Manual
ACE600
29
Mode is used to toggle between the two modes. Pressing the
on
or
off
value in the Enable column alternately enables and disables the noise
output.
Figure 2-11. AWGN display
To avoid signal clipping, the power of the input signal when combined
with awgn must be reduced to less t
han the instrument’s normal
maximum output power.When noise is applied, the maximum input
signal amplitude (S
max
) must be reduced to less than:
S
max
(dB) = 10*Log{1-10^
(Pn/10)
}-10 , where P
n
=No + 10*Log(NBW),
and NBW is the noise bandwidth.. With AWGN at full scale, the noise
power is typically -16 dBm, and the maximum applied signal power
must be 10.1 dBc below full scale at the instrument input.
S e ttin g th e AWGN Me n u P a ra m e te rs
S e t No is e De n s ity (Mo d e = N
o
)
Press the noise density field for the desired channel
Enter a negative numeric value (in dBm/Hz).
Press
Enter
to enter.
Press on/off to enable/disable the noise.
If an out of range condition exists, the noise density value will be
displayed with red characters.
The range of control for the noise density is 60 dB. However, the usable
range may be less, as it is limited by the maximum density the instrument
can produce and the intrinsic noise floor of the instrument. Additionally,
when AWGN is active, the channel attenuation should be limited to less than
32 dB.
