Chapter 16 493
W-CDMA Uplink Digital Modulation for Receiver Test
Setting Up a Multiple PRACH Signal
The second PRACH transmission will need to begin, at a minimum, in the 12th access slot (access
slot number 11 (0 + 11 = 11)). If you started the second transmission in access slot 10, it would be
ignored since the first transmission occupies part of that access slot.
In order to clearly show the second UE1 PRACH transmission on the PSA, we will select an access
slot that will not be occupied by other UEs that are configured later in this task.
c. Press
15 > Enter.
2. Configure UE2 for a single PRACH transmission starting in access slot 2.
a. Highlight the first access slot position for UE2.
b. Press
2 > Enter.
This PRACH will start its transmission between the first preamble for UE1 and its message part. The
message part for UE2 will begin during the first message part for UE1. For the length of time that the
message part for UE1 and UE2 occupy the same access slots, they will be additive creating a stronger
signal during that time period.
3. Leave UE4 to transmit a single PRACH starting in access slot 0.
This PRACH will occupy the same access slots as the first PRACH transmission for UE1. UE1 and UE4
will be additive during this transmission time period creating a higher signal level for the same period of
time.
4. Press
Apply Channel Setup.
When the Apply Needed annunciator appears, press the
Apply Channel Setup softkey. You will not see a
change in the signal until you press this softkey.
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