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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
  1. 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.
    • 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.
    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.

    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
  1. 3GPP Technical Specification TS 25.211 V3.0.0 "Physical channels and mapping of transport channel onto physical channels (FDD)," October 1999.
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