User`s guide

Chapter 15 383
W-CDMA Uplink Digital Modulation for Receiver Test
Setting Up a Multiple PRACH Signal
Figure 15-26 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
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