Rohde & Schwarz CMW-KE100, Руководство пользователя

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1xEV-DO Signaling
R&S
®
CMW-KM8xx/-KS8xx
23 User Manual 1173.9511.02 ─ 12
Baseband input settings for all used connectors:
● Sample Rate = User Defined, 100 MHz
● Baseband Input Level: enter the crest factor and the PEP displayed in
step 3 .
Digital I/Q output settings for all used connectors:
● Sample Rate = User Defined, 100 MHz
● Set Level Via = PEP
● PEP = PEP value displayed in
step 3
5. In the R&S AMU200A, activate fading and note the signal level. If you add noise to
the signal, note the signal level without noise.
6. Configure the I/Q input of the R&S CMW:
In the configuration tree, section "IQ Settings > IQ In > Baseband Level", enter the
signal level noted in the previous step.
Alternatively it is also possible, to specify the signal output level of the R&S
AMU200A, to note the resulting PEP and to enter this PEP value at the R&S
CMW
for "Baseband PEP". But this is not recommended.
7. Turn on the forward signal at the signaling application and set up a connection.
The configuration is now complete. Fading is active.
A reconfiguration of the settings at the R&S AMU200A during an active connection
to the DUT may result in the loss of the connection or in erroneous measurement
results.
After a reconfiguration of the baseband input settings of the R&S AMU200A, turn
the forward signal at the signaling application off and on again.
2.2.6 Internal Fading
Testing under realistic air interface conditions is important in order to verify the receiver
performance and the correct operation of the DUT's protocol stack implementation. For
example, packet error rates, throughput performance and correct operation of layer 1
procedures like RLP and IP statistics, where retransmission can be evaluated.
The internal fading module comes with a fading simulator and AWGN generator that
can be selectively enabled. It manipulates the generated forward link I/Q data stream
to emulate typical signal conditions at the DUT's receiver.
The following options are required to use the internal fading simulator in 1xEV-DO:
●
one fader I/Q board R&S CMW-B510F or R&S CMW-B520F per signaling instance
using internal fading
●
a single option R&S CMW-KE100 "Basic Fading Support: AWGN generator"
●
a single option R&S CMW-KE800 "CDMA2000 Fading Profiles from C.S0032-
C6.4.1 and C.S0011-C6.4.1"
2.2.6.1 Fading Simulator
Multi-path fading is an effect which occurs in real world situations. A signal sent from
the base station may take different routes (direct line of sight and/or reflected) and
General Description
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