Agilent Technologies E4428C, Руководство пользователя

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Chapter 17 589
W-CDMA Downlink Digital Modulation for Receiver Test
Configuring for Transmit Diversity and BERT
Configuring for Transmit Diversity and BERT
Both ESGs are configured with the same settings. The only difference will be setting one as antenna one and
the other as antenna two. Refer to
Figure 17-10 on page 590 for the equipment setup diagram.
In this section, factory preset parameters are used for all channels except for the DPCH. If your needs
require specific settings for the different channels, changing the parameters should not modify the
measurement setup demonstrated here, provided the channels for both ESGs are configured the same.
NOTE
Ensure that both the
Out-of-sync Test Off On
softkey and the
Compressed Mode Off On
softkeys
are set to Off . If either of the two features are active, a conflict of settings error message
(error -221) is generated when the antenna selection is made. This will prevent you from
performing the test. Refer to
“Generating the Baseband Signal and Activating the
Out-Of-Synchronization Test Feature” on page 605 for instructions on accessing the
Out-of-sync Test Off On
softkey and “Setting the Compressed Mode Parameters” on page 615
for the locating the
Compressed Mode Off On
softkey.
Equipment Set Up
Required Equipment
The following equipment is required to make transmit diversity BER measurements.
• one E4438C ESG Vector Signal Generator with Options 001/601or 002/602, 400, and UN7
Both ESGs can have Option UN7 (BERT) installed, however it is only required on one of the ESGs.
• one E4438C ESG Vector Signal Generator with Options 001/601or 002/602 and 400
• one Agilent 87302C Isolator or an equivalent isolator or combiner
• an external controller to control the UE being tested
• an interface level matching circuit for interfacing between the UE being tested and the signal generator
when the UE signal specifications are different from those of the signal generator