Agilent Technologies E4428C, User Manual, Page: 533 / 700

Chapter 16 509
W-CDMA Uplink Digital Modulation for Receiver Test
DPCH
Figure 16-41 Excessive Puncturing
5. Select the encoder type.
a. Move the cursor to highlight the
Coding
field.
b. Press
Edit Item
>
1/3 Conv
.
This will actually increase the puncturing slightly. This is because the encoding is changed from
1/2 convolutional encoding (one bit in, two bits out) to 1/3 convolutional encoding (one bit in, three
bits out).
6. Set the rate matching.
a. Move the cursor to highlight the
Rate Match Attr
field.
b. Press
256
>
Enter
.
Notice that the puncture rate is now reduced to an acceptable level.
7. Press
Return
>
2
>
Enter
>
TrCH Setup
.
Notice that the puncture rate for DCH 2 matches the maximum puncture rate. The puncture rate
increased when the parameters for channel three were modified. This can be adjusted by reducing the
block size.
8. Set the block size.
a. Move the cursor to highlight the
Blk Size
field.
b. Press
95
>
Enter
>
Apply Channel Setup
.
When the
Apply Needed
annunciator appears, press the
Apply Channel Setup
softkey. The new
settings are not be applied to the signal until this softkey is pressed.
Max Puncture
Puncture