Agilent Technologies E4428C, Руководство пользователя

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486 Chapter 16
W-CDMA Uplink Digital Modulation for Receiver Test
Setting Up a Multiple PRACH Signal
configuration, is determined by the base station network; it is not defined by the 3GPP standards. If
the message part TTI is 20 ms, the TFCI is repeated in the second radio frame (each radio frame is
10 ms in length).
c. Press
PN Sequence
>
PN9
.
3. Press
Apply Channel Setup
.
When the
Apply Needed
annunciator appears, press the
Apply Channel Setup
softkey. The new
parameters will not be applied to the signal until this softkey is pressed.
Setting the Data Part Parameters
1. Set the data type for the data part.
a. Highlight the
Msg-Data Data
field.
b. Press
Edit Item
.
Again you can see that you are provided different choices for the data type. The transport channel
selection (factory default) utilizes the RACH (random access channel) which gives you greater
flexibility in controlling the data parameters such as the data rate (setting block size), CRC size, and
puncture rate.
c. Press the
Transport CH
softkey as the data selection type.
The softkey menu level, where PRACH was selected as the channel type, gives you access to the
transport channel table editor where you can set its parameters.
2. Select the message part slot format.
a. Highlight the Slot Format field.
Note the 60 ksps symbol rate (factory default) shown in the
Symbol Rate
field.
b. Press
1
>
Enter
.
You have a choice of slot formats: 0, 1, 2, and 3. Notice that the symbol rate changed to 30 ksps.
Remember that the symbol rate is controlled by the slot format.
As seen in step b above, you can adjust your symbol rate by changing the value in the
Slot Format
field. Conversely, you can adjust your slot format by using the
Symbol Rate
field.
Each 10 ms message part period is subdivided into 15 slots and the slot format determines the attributes
for them. Each format is defined in the 3GPP standards.
3. Press
Apply Channel Setup
.
When the
Apply Needed
annunciator appears, press the
Apply Channel Setup
softkey. The new
parameters will not be applied to the signal until this softkey is pressed.