Signal Routing and System Configuration
R&S
®
SMW200A
214User Manual 1175.6632.02 ─ 16
We use the configuration from the first instrument, hence "Trigger Source =
External Global Trigger 1" is selected. The R&S SMW expects the "Global Trig-
ger 1" signal at the USER3 connector.
5. Select "System Configuration > External RF and I/Q" and select "Connect" for both
external instruments.
The RF outputs are active, the fading simulator is enabled but not running, the
baseband generator is not active. The whole system is triggered jointly, as descri-
bed in "To start signal generation" on page 214.
To start signal generation
1. In R&S SMW#2, select "Baseband > On".
2. In the R&S SMW#1, select "Baseband > On".
3. To trigger the signal generation in both instruments form R&S SMW#1, select
"Global Connectors > Execute Trigger".
The baseband generators and the fading simulators in both instruments start simul-
taneously.
3.9.9
How to Connect an R&S
®
CMW500 for Fading Applications
You can use R&S SMW to superimpose fading on the baseband signal generated by
an R&S
®
CMW500. The R&S SMW must be connected to the digital I/Q interface of the
R&S
®
CMW500.
The Table 3-8 lists the stream mapping for this configuration; the table entries show
the stream to interface mapping in the order the related boards are on the instrument's
rear panel.
Table 3-8: Overview of the stream mapping
Digital inter-
face
Direction Stream Digital inter-
face
Direction Stream
CODER1 Input Stream to Baseband
A
Coder12 Input Stream to Baseband
B
FADER 1 Input Stream to Baseband
C
FADER 2 Input Stream to Baseband
D
FADER 3 Output Stream C FADER 4 Output Stream D
BBMM 1 Output Stream A BBMM 2 Output Stream B
The Figure 3-25 shows a 1x2x2 MIMO setup with two downlink paths using the con-
nectors DIG IQ 1 to 4 of the R&S
®
CMW500. In this example, the R&S SMW is
synchronized to a 10 MHz reference signal provided by the R&S
®
CMW500. The
R&S
®
CMW500 also provides the R&S SMW with its trigger signal.
All connections between R&S SMW and the R&S
®
CMW500 are established via the
rear panels of the instruments.
How to Connect External Instruments and Configure the Signal Flow
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