Rohde & Schwarz CMU 200 - RX WCDMA dem Odulation; TX WCDMA Modulation; Wcdma

Manual Test Procedure R&S CMU
1100.4903.82 1.20 E-5
WCDMA
T
he following tests can be carried out only if the WCDMA (R&S CMU-K66) software options are
installed and enabled by entering a key code.
TX WCDMA Modulation
Only with option R&S CMU-K66:
The WCDMA modulation parameter of a TX path is measured.
Preparation: Test setup TX5:
 Connect spectrum analyzer FSIQ to RF2 and RF3 OUT.
Control:  Set R&S CMU generator to specified RF frequency.
Settings at R&S CMU:
R&S CMU-WCDMA-generator:
Total level = CPICH-level
relative level : SCHs = –35dB, P-CCPCH = –35 dB, DPDCH = 0dB,
DPCCH/DPDCH = 0dB, PICH level = –35dB
DPCH Codechannel = 4 (R&S CMU SW Base >= V3.07 necessary)
Generator-Mode: 3GPP Reference Measurement Channel 12.2kbit/s and 384
kbit/s (entspricht Symbolrate 480ksps)
Settings at FSIQ 7:
WCDMA BTS Analyser, Code Domain Power,
Display-Result: Result summary
Select Channel Number:
16 für 12.2 kbit/s, 256 für 384 kbit/s
Code Channel Conf: 480ksps für 384 kbit/s
Test: Global EVM are measured.
RX WCDMA Dem odulation
Only with option R&S CMU-K65:
The WCDMA demodulation quality of a RX path is measured.
Preparation:  Connect WCDMA signal generator to RF2 and RF4 IN (test setup RX3).
WCDMA RX Measurement
The signal generator must be synchronized with the R&S CMU via the 10 MHz
reference frequency.
Control:  Set R&S CMU analyzer and SMIQ to specified RF frequency.
Signal Generator SMIQ:
Signal Typ 2
Low_EVM-Mode
R&S CMU:
Application WCDMA
RF mode = Manual
RF Attenuation = Low Noise
Statistical Count = 10
Test:
 Measure EVM rms, I/Q origin offset, I/Q imbalance, carrier frequency error as
well as peak code domain error.