Agilent Technologies E4428C, Руководство пользователя

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Chapter 15 419
W-CDMA Digital Modulation for Component Test
W-CDMA Downlink Modulation
Creating a User-Defined Multicarrier W-CDMA State
This procedure teaches you how to perform the following tasks:
• “Selecting a Multicarrier W-CDMA Setup” on page 419
• “Adding a Carrier” on page 419
• “Modifying Carrier Parameters” on page 419
• “Clipping the Multicarrier Waveform” on page 421
• “Generating the Waveform” on page 421
• “Applying Modifications to an Active Multicarrier Waveform” on page 422
• “Configuring the RF Output” on page 422
Selecting a Multicarrier W-CDMA Setup
1. Press
Preset
.
2. Press
Mode
>
W-CDMA
>
Arb W-CDMA
.
3. Press
Multicarrier Off On
>
Multicarrier Define
.
The
Multicarrier WCDMA 3GPP Setup
table editor is now displayed, showing parameters for the
default two-carrier setup.
Adding a Carrier
1. Highlight the
SCH
carrier in table row 2 and press,
Insert Row
>
3 DPCH
.
This adds a predefined 3 DPCH carrier between the two original default carriers. You can also add a custom
W-CDMA carrier that has been previously created and stored.
Modifying Carrier Parameters
1. Press
Return
.
2. Highlight the
Freq Offset
value (
7.500000 MHz
) for the new 3 DPCH carrier in row 2 and press,
Edit Item
>
−
2.5
>
MHz
. Refer to, “Multicarrier Setup Page 1” on page 420 .
3. Highlight the
Power
value (
0.00 dB
) for the new 3 DPCH carrier in row 2 and press,
Edit Item
>
−
10
>
dB
. Refer to, “Multicarrier Setup Page 1” on page 420 .
4. Highlight
Primary Scramble Code
value
N/A
for the new 3 DPCH carrier in row 2 and press,
Edit
Item
>
5
>
Enter
. Refer to, “Multicarrier Setup Page 2” on page 421 .