Chapter 17 623
W-CDMA Downlink Digital Modulation for Receiver Test
Making Compressed Mode Signal Measurements
Making the BERT Measurement
This procedure demonstrates how to make W-CDMA compressed signal BER measurements. Option UN7
must be installed on the ESG. The setup diagram for this procedure is shown in Figure 17-24 on page 612.
For more information on BERT measurements see Chapter 9, “BERT,” on page 263.
Configuring the UE
Using the UE controller, configure the mobile for the call setup procedure to receive the ESG signal,
ensuring that the receiver frequency is set to the same as the ESG.
The UE must be able to demodulate and decode the data from the ESG, and then send this data back to the
ESG for the BERT measurement. The return signal to the ESG must be a TTL or CMOS level signal.
Selecting the ESG BERT Data Pattern and Total Bits
1. Access the BERT function.
For an ESG with Option UN7 Installed
Press
Aux Fctn > BERT > Configure BERT.
For an ESG with Options UN7 and 300 Installed
Press
Aux Fctn > BERT > Baseband BERT > Configure BERT.
If the
Data softkey does not show that PN9 is the selected data pattern, press
Data > PN9.
The selected PN sequence must match the data PN sequence used on the channel being measured. For
example if the DCH (DTCH) is using PN9 data, then the data selection in the BERT function must also
be PN9.
2. Press
Total Bits > 5110 > Bits.
5110 bits (ten times the PN9 data length) at 12.2 kbps (current data rate for the DCH) takes
0.419 seconds to test
. The value used in this step is merely an example of the number of bits being tested,
you can set the total bits to meet your test needs.
Selecting the ESG BERT Trigger
1. Press
Return > Configure Trigger.
If the
BERT Trigger softkey does not show Trigger Ke y as the selected trigger, press
BERT Trigger > Trigger Key.
2. Press
Return > BERT Off On to On.
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