WCDMA3G_STTDEncoder
Description: STTD encoder.
Library: 3GPPFDD 10-99, Transmit Diversity
Class: SDFWCDMA3G_STTDEncoder
Parameters
| Name | Description | Default | Type | Range |
|---|---|---|---|---|
| DL_PhyCHType | downlink physical channel type: DPCH_15kbps_TF0_T2_P4, DPCH_15kbps_TF2_T2_P4, DPCH_30kbps_TF0_T2_P2, DPCH_30kbps_TF2_T2_P2, DPCH_30kbps_TF0_T2_P4, DPCH_30kbps_TF2_T2_P4, DPCH_30kbps_TF0_T2_P8, DPCH_30kbps_TF2_T2_P8, DPCH_60kbps_TF0_T2_P4, DPCH_60kbps_TF2_T2_P4, DPCH_60kbps_TF0_T2_P8, DPCH_60kbps_TF2_T2_P8, DPCH_120kbps_TF8_T4_P8, DPCH_120kbps_TF0_T4_P8, DPCH_240kbps_TF8_T4_P8, DPCH_240kbps_TF0_T4_P8, DPCH_480kbps_TF8_T8_P16, DPCH_480kbps_TF0_T8_P16, DPCH_960kbps_TF8_T8_P16, DPCH_960kbps_TF0_T8_P16, DPCH_1920kbps_TF8_T8_P16, DPCH_1920kbps_TF0_T8_P16, PCCPCH | DPCH_30kbps_TF2_T2_P8 | enum | † |
| † where TFn = number of transmit format indicator bits Tn = number of transmit power control bits Pn = number of pilot bits Fn = number of feedback indicator bits |
||||
Pin Inputs
Pin |
Name |
Description |
Signal Type |
|---|---|---|---|
1 |
inData |
symbols in |
complex |
Pin Outputs
Pin |
Name |
Description |
Signal Type |
|---|---|---|---|
2 |
Ant1 |
output symbol to antenna1 |
complex |
3 |
Ant2 |
output symbol to antenna2 |
complex |
Notes/Equations
- This model is used to encode symbols for space time block coding based transmit diversity (STTD). The open loop downlink transmit diversity uses STTD. STTD encoding is mandatory in UE and optional in UTRAN.
The STTD encoder block diagram is shown in the following figure.
The DPDCH, TPC, and TFCI are STTD encoded.
Each firing, a cycle of tokens are produced on Ant1 and Ant2 when a cycle of tokens are consumed by inData; cycle values are given in the following table.- For SF = 256, if there is only one dedicated pilot symbol, it is STTD encoded with the last symbol (data or DTX) of the second data field of the slot (encoding for this pilot symbol is completed by WCDMA3G_STTDMux).
- For SF = 512 DPCH and P-CCPCH, the last odd data symbol in every radio frame is not STTD encoded and the same symbol is transmitted with equal power from the two antennas.
STTD Encoder Block Diagram
DL_DPCHType
Symbols per Slot
Pilot Symbols per Slot
Cycle
DPCH_15kbps_TF0_T2_P4
5
2
45
DPCH_15kbps_TF2_T2_P4
5
2
45
DPCH_30kbps_TF0_T2_P2
10
1
9
DPCH_30kbps_TF2_T2_P2
10
1
9
DPCH_30kbps_TF0_T2_P4
10
2
2
DPCH_30kbps_TF2_T2_P4
10
2
2
DPCH_30kbps_TF0_T2_P8
10
4
2
DPCH_30kbps_TF2_T2_P8
10
4
2
DPCH_60kbps_TF0_T2_P4
20
2
2
DPCH_60kbps_TF2_T2_P4
20
2
2
DPCH_60kbps_TF0_T2_P8
20
4
2
DPCH_60kbps_TF2_T2_P8
20
4
2
DPCH_120kbps_TF8_T4_P8
40
4
2
DPCH_120kbps_TF0_T4_P8
40
4
2
DPCH_240kbps_TF8_T4_P8
80
4
2
DPCH_240kbps_TF0_T4_P8
80
4
2
DPCH_480kbps_TF8_T8_P16
160
8
2
DPCH_480kbps_TF0_T8_P16
160
8
2
DPCH_960kbps_TF8_T8_P16
320
8
2
DPCH_960kbps_TF0_T8_P16
320
8
2
DPCH_1920kbps_TF8_T8_P16
640
8
2
DPCH_1920kbps_TF0_T8_P16
640
8
2
PCCPCH
135
0
135
References
- 3GPP Technical Specification TS 25.211 V3.0.0 "Physical channels and mapping of transport channel onto physical channels (FDD)," October 1999.