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 > Tr C H Se t u p .
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
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