Rohde & Schwarz R&S SMW200A - Page 426

Simulating Fading, Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMW200A
426User Manual 1175.6632.02 ─ 30
The available settings depend on the selected Mode.
Settings:
Show Powers For Output............................................................................................426
Set Noise Power Via................................................................................................... 426
Reference Mode..........................................................................................................427
Bit Rate....................................................................................................................... 427
Carrier/Noise Ratio, Signal/Noise Ratio...................................................................... 427
E
b
/N
0
............................................................................................................................427
Carrier Power, Signal Power....................................................................................... 428
Noise Power (System Bandwidth), Interferer Power...................................................428
Noise Power (Total Bandwidth)................................................................................... 429
Carrier + Noise Power, Signal + Noise Power (System Bandwidth), Carrier + Interferer
Power, Signal + Interferer Power ............................................................................... 429
Carrier + Noise PEP, Signal + Noise PEP (Total Bandwidth), Carrier + Interferer PEP,
Signal + Interferer PEP............................................................................................... 430
Noise Bandwidth......................................................................................................... 430
Resulting CW Frequency Offset..................................................................................430
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 4.4, "System Configuration Settings",
on page 124).
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" func-
tion whenever you:
●
Add baseband signals with different signal bandwidth
●
Add streams in the "Stream Mapper".
For a description, see Chapter 9.2, "Querying Information on the Baseband Power Lev-
els", on page 621.
Remote command:
[:SOURce<hw>]:AWGN:DISP:MODE on page 1094
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.
Adding Noise to the Signal