
316 Chapter 13
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.
The Scramble Code field has two sets: primary and secondary, each with a field range of 0
through 511. The primary and secondary sets are determined by the Scramble Offset field.
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
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