Chapter 15 435
W-CDMA Digital Modulation for Component Test
W-CDMA Concepts
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. If the Scramble
Offset field is zero, then the scramble code is in the primary set. Any non-zero entry enables the secondary
set. The Scramble Offset field has a range of 0 through 15.
The Scramble Type field has three modes: Standard, Right Alternate, and Left Alternate. The standard
scramble type has a value of zero and does not contribute to the scramble code. Selecting the right alternate
adds 16384 to the actual scramble code, whereas the left alternate adds 8192.
Scramble Codes with Standard Scramble Type
A primary scramble code is the product of the Scramble Code field entry and 16. Therefore, the primary
scramble code set contains all multiples of 16 from 0 through 8176.
A secondary scramble code is the sum of the non-zero Scramble Offset field entry and the primary
scramble code. The secondary scramble code set uses the numbers in between the multiples of 16.
Thus, all numbers from 0 through 8191 are available for scramble codes when using the standard scramble
type.
Refer to the following for examples of scramble codes generated with the primary and secondary sets:
Tabl e 15- 2
Where n = scramble code
i = scramble code field input
k = scramble offset field input
m = scramble type field input
Tabl e 15- 3
A: Primary set B: Secondary set
i = 6 i = 8
k = 0 k = 7
m = 0 m = 0
n = 96 n = 135
n 16 i×()km++=
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