1xEV-DO Signaling
R&S
®
CMW-KG8xx/-KM8xx/-KS8xx
22
User Manual 1173.9511.02 ─ 11
7. Turn on the forward link signal at the signaling application and set up a connection.
The configuration is now complete. Fading is active.
Note that 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, you
must turn the forward link signal at the signaling application off and on again.
2.2.5 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"
2.2.5.1
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
reach the receiving antenna at different times leading to a sum of phase shifted and, if
the receiver is moving, frequency shifted signals.
The internal fading simulator supports propagation conditions defined in the table
6.4.1-1 of 3GPP2 C.S0032 e.g. various vehicle speeds, numbers of paths, path power
settings and delays.
A faded signal has a higher crest factor than an unfaded one. In order to avoid distor-
tion, the baseband signal must be attenuated before entering the fading module, with
the necessary attenuation (insertion loss) depending on the selected fading profile.
In 1xEV-DO signaling, the insertion loss at the baseband level can be calculated auto-
matically or set manually. It is automatically compensated on the HF level, which
implies a shift of the allowed DL power level range to the same extent, but in opposite
direction.
General Description
深圳德标仪器
135-1095-0799