434 Chapter 15
W-CDMA Digital Modulation for Component Test
W-CDMA Concepts
Calculating Downlink Scramble Codes
The Option 400 signal generator implements scrambling codes for downlink channels in compliance with
3GPP specifications. This is done through the use of Scramble Code, Scramble Type, and Scramble
Offset fields in the downlink Edit Channel Setup table editor. These fields are linked so that an entry to
any field affects the actual scramble code. To better understand the relationship, please refer to the following
formula.
Figure 15-14
Tabl e 15- 1
Where n = scramble code Range: 0 to 24575
i = scramble code field input Primary: Range 0 to 511
Secondary: Range 0 to 511
k = scramble offset field input Range: 0 to 15
m = scramble type field input Standard: adds 0
Right Alternate: adds 16384
Left Alternate: adds 8192
n 16 i×()km++=
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