482 Chapter 16
W-CDMA Uplink Digital Modulation for Receiver Test
Setting Up a Multiple PRACH Signal
Figure 16-26 PRACH Code Setup Display
Controlling the PRACH Transmission
1. Set the PRACH scramble code.
a. Highlight the Scrambling Code field.
b. Press
506 > Enter.
The range for this field is 0 to 8191.
The scrambling code, in conjunction with the preamble signature, is used to uniquely identify the
mobile. The same scrambling code number is used for both the preamble and message part. The base
station informs the UE which code to use.
2. Set the number of transmitted 80 ms periods.
This feature is used in connection with a trigger for starting the PRACH transmission. Use this feature
when you want to measure the PRACH transmission for a set number of cycles or you just want to start
the transmission using a trigger.
a. Highlight the Number of 80ms field.
b. Press
Edit Item.
Two softkeys are now showing,
Enter and Infinity. The Enter key is used when you want to enter a
finite number of 80 ms period repetitions. You can actually enter the desired number without
pressing the
Edit Item softkey. The Enter softkey will appear once you start entering a value. The
Infinity selection lets the transmissions occur indefinitely once a trigger is received until it is
Configures the
Control Part
Configures the Data Part
Configures the
Message Part
Configures
the PRACH
Controls the Spacing
Between the Preamble and
the Message Part
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