General Description
R&S
®
CMW-KM750/-KM751
13
User Manual 1173.9670.02 ─ 05
3.2.1 Test Setup
The downlink RF generator signal of the R&S
CMW is fed to the input of the DUT. The
R&S
CMW measures the uplink signal. Most conveniently, a bi-directional connection
with a single coax cable is used. The DUT is connected to one of the RF input connectors
(RF COM) at the front panel of the R&S
CMW. No additional cabling and no external
trigger is needed.
The input level ranges of all RF COM connectors are identical.
See also: "RF Connectors" in the R&S CMW user manual, chapter "Getting Started"
Fig. 3-3: Test setup for RX tests
3.2.2 Performing a TD-SCDMA RX Test
For an RX measurement you need to generate a TD-SCDMA downlink signal with an
information bit rate of 12.2 kbps. The DTCH must transport one of the supported data
patterns (see
on page 43). The signal may contain either a Ref-
erence Measurement Channel (RMC) including both DTCH and DCCH or it may contain
user data only (DTCH only, no DCCH), see
The downlink signal can be generated using the GPRF generator and an ARB file. Order
the UE to loop back the received data, using a test mode and measure the resulting uplink
signal using the multi evaluation measurement.
The components of this scenario have to be configured as follows:
●
ARB file:
For transport channel mode "RMC" you can use the ARB file named
TD-SCDMA-DL_12k2.wv
(uses all 1 pattern).
Alternatively (and for transport channel mode "USER") you can generate an ARB file
using R&S WinIQSIM2 and the following settings:
–
Configuration of cell 1 > enhanced channel settings > show DCH details:
Select a 12.2 kbps RMC as coding type.
For transport channel mode "USER", disable the DCCH (the coding type changes
to "User").
Select a data source for the transport channel.
–
Marker settings:
Set the user period of marker 4 to 25600 chips (4 subframes).
–
Filter/Clipping/ARB settings:
Enter a sequence length of 2 frames (4 subframes).
●
GPRF generator:
TD-SCDMA RX Tests
