Simulating Fading, Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMW200A
393User Manual 1175.6632.02 ─ 16
– "Mode = Standard"
– "Signal Routing = A -> A ,B ->B"
●
"Baseband A"
– "Custom Digital Modulation > Set acc. to standard > WCDMA-3GPP"
– "State > On".
– "Symbol Rate = 3.840 Msym/s"
●
"AWGN A"
– "General > Mode > Additive Noise"
– "General > Min Noise/System Bandwidth Ratio = 3"
– "General > State > On"
– "Noise Power / Output Results > Show Results for Output > RF A"
– "Noise Power / Output Results > Reference Mode > Carrier"
– "Noise Power / Output Results > Carrier/Noise Ratio = 10 dB"
●
"RF A > On"
Figure 5-3: AWGN: Understanding the displayed information
1 = Bit Rate derived from the selected "Symbol Rate = 3.840 Msym/s"
2 = selected Carrier/Noise Ratio
3 = Carrier Power = Status bar > Level = 30 dBm
4 = Noise Power calculated form the "Carrier Power" and the "Carrier/Noise Ratio" = -30 dBm - 10 dB =
-40 dBm; you would measure this value if you perform channel power measurement with a signal ana-
lyzer
5 = Carrier+Noise Power = power at the RF A output; i.e. the power a connected power meter would mea-
sure
6 = Noise Bandwidth = System Bandwidth*Minimum Noise/System Bandwidth Ratio = 3.840 MHz*3 =
11.520 MHz
Use the built-in graphical signal monitoring function of the instrument to display the sig-
nal characteristics in real-time, see "To observe the effect of enabled additive noise
(AWGN)" on page 587.
Adding Noise to the Signal
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