Rohde & Schwarz SMW200A - Connected Instrument; Reference Mode; Set Noise Power Via; Show Powers for Output

Simulating Fading, Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMW200A
399User Manual 1175.6632.02 ─ 16
Carrier + Noise Power, Signal + Noise Power (System Bandwidth), Carrier + Interferer
Power, Signal + Interferer Power ............................................................................... 403
Carrier + Noise PEP, Signal + Noise PEP (Total Bandwidth), Carrier + Interferer PEP,
Signal + Interferer PEP............................................................................................... 403
Noise Bandwidth......................................................................................................... 403
Show Powers for Output
Sets the output to which the displayed settings are related to.
The available outputs depend on the current signal flow configuration, in particular on
the current stream mapping (see Chapter 3.4, "System Configuration Settings",
on page 137).
This setting also influences:
●
The way the interfering parameters are displayed, e.g. if the SNR value is defined
as C/N or as S/N.
●
The value units:
– The values related to the RF outputs are displayed in dBm
– The values related to the baseband outputs - in dB
Tip: For better overview of the power values, use the build-in "Baseband Powers"
function whenever you:
●
Add baseband signals with different signal bandwidth
●
add streams in the "Stream Mapper".
For description, see Chapter 8.2, "Querying Information on the Baseband Power Lev-
els", on page 588.
Remote command:
[:SOURce<hw>]:AWGN:DISP:MODE on page 1007
Connected Instrument
Indicates the connected instrument.
Set Noise Power Via
In "Additive Noise" mode, selects the way the noise power is determined.
The following correlation applies:
"C/N or S/N"= ("E
b
/N
0
")*(f
bit
/B
sys
), where:
●
"C/N or S/N" is the carrier/noise ratio
●
"E
b
/N
0
" is the ratio of bit energy to noise power density
●
"Bit Rate "f
bit
= "Symbol Rate" x Modulation Value
●
B
sys
is the system bandwidth.
See also Chapter 5.2.2, "About the AWGN Generator", on page 390.
Remote command:
[:SOURce<hw>]:AWGN:POWer:MODE on page 1007
Reference Mode
Selects whether the carrier or the noise power is kept constant if the C/N or Eb/N0 ratio
is changed.
Adding Noise to the Signal