WCDMA3G_SCGtoScrmb
Description: Convert one SCG index to eight primary scrambling codes
Library: 3GPPFDD 10-99, Common Physical Channels
Class: SDFWCDMA3G_SCGtoScrmb
Parameters
Name |
Description |
Default |
Type |
|---|---|---|---|
ChipRate |
chip rate of the system: Chip Rate 3.84M |
Chip Rate 3.84M |
enum |
Pin Inputs
Pin |
Name |
Description |
Signal Type |
|---|---|---|---|
1 |
SCG |
index of one scrambling code group |
int |
Pin Outputs
Pin |
Name |
Description |
Signal Type |
|---|---|---|---|
2 |
Scrmb |
a group of eight scrambling codes |
multiple complex |
3 |
Index |
indices of eight scrambling codes |
multiple int |
Notes/Equations
- This model is used to convert the index of one scrambling code group to a group of 8 primary scrambling codes in downlink.
Each firing, 38400 tokens of each Scrmb signal and one token of each Index signal are produced when one token of SCG is consumed. - The Primary CCPCH is always transmitted using the primary scrambling code. There are 512 primary scrambling codes that are divided into 64 groups; each group consists of eight scrambling codes.
Let
primary scrambling code index be PSid Π(0, 1, ... , 511).SCG index be SCGid Π(1, 2, ... , 64)
Then one SCGid corresponds to a group of eight primary scrambling codes whose indices are:
The index of downlink scrambling code Sid = PSid × 16.PSid = ( SCGid −1) × 8 + (0, 1, ... , 7)
There are two steps to convert an SCG index to a group of eight scrambling codes:- Form the index of SCG; the corresponding indices Sid of eight scrambling codes are known.
- Generate the scrambling codes according to the indices obtained. For details regarding scrambling code generation, refer to WCDMA3G_DnLkAllocOVSF.
References
- 3GPP Technical Specification TS 25.213 V3.0.0, "Spreading and Modulation (FDD)," October 1999.