Rohde & Schwarz R&S SMW200A - Page 431

Simulating Fading, Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMW200A
431User Manual 1175.6632.02 ─ 30
To configure the AWGN for receiver sensibility tests with predefined SNR of the
receiver
We assume that an AWGN interfering signal with the following characteristics is
required:
The mean power of the interfering signal is -82.5 dBm/BW and C/N = 12.6 dB.
1. Select "AWGN" and enable:
● "Mode > Additive Noise"
● "System Bandwidth = 4.5 MHz"
The definition of the interfering signal mean power is dBm/BW, where BW is
the system bandwidth. The system bandwidth of the LTE signal is the occupied
bandwidth.
See also Figure 6-2.
● "Min Noise/System Bandwidth Ratio = 1.5"
2. Select "Noise Power/Output Results" and enable:
● "Set Noise Power Via = C/N"
● "Reference Mode = Carrier"
● "Carrier/Noise Ratio = 12.6 dB"
The dialog confirms the required mean power of the interfering signal "Noise Power
(System Bandwidth) = -82.5 dBm".
3. Select "AWGN > General > State > On".
Adding Noise to the Signal