Rohde & Schwarz SMW200A - Page 1019

Remote Control Commands
R&S
®
SMW200A
1004User Manual 1175.6632.02 ─ 16
Example: Generating an additive noise signal
The following example shows how to adjust the AWGN settings to generate a signal
with the following characteristics:
●
The carrier signal is an uplink EUTRA/LTE signal with:
– "Channel Bandwidth = 1.4 GHz", i.e. "Occupied Bandwidth = 1.080 MHz"
– "RF Frequency = 1.950 GHz"
– "RF Level = -76 dBm"
●
Required is an SNR of 12.7 dB
SCONfiguration:MODE STANdard
SOURce1:FREQuency:CW 1950000000
SOURce1:POWer:LEVel:IMMediate:AMPlitude -76
SOURce1:AWGN:MODE ADD
// set the system bandwidht to the occupied bandwidth
SOURce1:AWGN:BWIDth 1080000
SOURce1:AWGN:BWIDth:RATio 1.5
SOURce1:AWGN:STATe ON
SOURce1:AWGN:BWIDth:NOISe?
// Response: 1620000
SOURce1:AWGN:DISP:MODE RFA
SOURce1:AWGN:POWer:MODE CN
SOURce1:AWGN:POWer:RMODe CARRier
SOURce1:AWGN:BRATe?
// Response: 100000
SOURce1:AWGN:CNRatio 12.7
SOURce1:AWGN:ENRatio?
// Response: 23.0342375548695
SOURce1:AWGN:POWer:CARRier?
// Response: -76
// the Level display indicates the PEP of the carrier
// Querry the resulting noise power, in the system and total bandwidht
SOURce1:AWGN:POWer:NOISe?
// Response: -88.7
SOURce1:AWGN:POWer:NOISe:TOTal?
// Response: -88.7
// Querry the carrier+noise power and PEP
SOURce1:AWGN:POWer:SUM?
// Response: -75.7728170942726
SOURce1:AWGN:POWer:SUM:PEP?
// Response: -76
[:SOURce<hw>]:AWGN:CMODe[:STATe]...................................................................... 1005
[:SOURce<hw>]:AWGN:STATe.....................................................................................1005
[:SOURce<hw>]:AWGN:MODE..................................................................................... 1005
[:SOURce<hw>]:AWGN:BWIDth....................................................................................1006
[:SOURce<hw>]:AWGN:BWIDth:RATio..........................................................................1006
SOURce Subsystem