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WCDMA3G_TCEncoder


Description: Turbo code encoder
Library: 3GPPFDD 10-99, Channel Coding
Class: SDFWCDMA3G_TCEncoder

Parameters

Name

Description

Default

Type

LinkDir

link direction: Downlink, Uplink

Downlink

enum

TrCHType

transport channel type: DCH_8_kbps, DCH_16_kbps, DCH_32_kbps, DCH_64_kbps, DCH_128_kbps, DCH_256_kbps, DCH_512_kbps, DMCH_2_4_kbps, DMCH_12_2_kbps, DMCH_64_kbps, DMCH_144_kbps, DMCH_384_kbps, DMCH_2048_kbps, BCH_11_1_kbps, BCH_12_3_kbps

DCH_64_kbps

enum

TTI

transmission time interval: TTI_10ms, TTI_20ms, TTI_40ms, TTI_80ms

TTI_10ms

enum

TurboCodeType

turbo code type: k 4 g1 013 g2 015 Rate One Third

k 4 g1 013 g2 015 Rate One Third

enum

Pin Inputs

Pin

Name

Description

Signal Type

1

in

input code block

int

2

CurSize

size of current input block

int

Pin Outputs

Pin

Name

Description

Signal Type

3

out

output encoded code block

int

Notes/Equations
  1. This model is used to implement turbo code encoding. See the following figure.

    Encoder Diagram
    The schematic for this subnetwork is shown in the following figure.

    WCDMA3G_TCEncoder Schematic
  2. Coding schemes are listed in the following table.
    Turbo Coding Schemes

    DCHType

    LinkDir

    CodeType

    Coding

    DCH_8_kbps

    any

    k 4 g1 013 g2 015 Rate One Third

    zero output

    DCH_16_kbps

    any

    k 4 g1 013 g2 015 Rate One Third

    zero output

    DCH_32_kbps

    any

    k 4 g1 013 g2 015 Rate One Third

    zero output

    DCH_64_kbps

    any

    k 4 g1 013 g2 015 Rate One Third

    rate 1/3 coding

    DCH_128_kbps

    any

    k 4 g1 013 g2 015 Rate One Third

    rate 1/3 coding

    DCH_256_kbps

    any

    k 4 g1 013 g2 015 Rate One Third

    rate 1/3 coding

    DCH_512_kbps

    any

    k 4 g1 013 g2 015 Rate One Third

    rate 1/3 coding

    DMCH_2_4_kpbs

    any

    k 4 g1 013 g2 015 Rate One Third

    zero output

    DMCH_12_2_kpbs

    any

    k 4 g1 013 g2 015 Rate One Third

    zero output

    DMCH_64_kbps

    any

    k 4 g1 013 g2 015 Rate One Third

    rate 1/3 coding

    DMCH_144_kbps

    any

    k 4 g1 013 g2 015 Rate One Third

    rate 1/3 coding

    DMCH_384_kbps

    any

    k 4 g1 013 g2 015 Rate One Third

    rate 1/3 coding

    DMCH_2048_kbps

    Uplink

    k 4 g1 013 g2 015 Rate One Third

    rate 1/3 coding

    BCH_11_1_kbps

    Downlink

    k 4 g1 013 g2 015 Rate One Third

    zero output

    BCH_12_3_kbps

    Downlink

    k 4 g1 013 g2 015 Rate One Third

    zero output

    Input bits stream are encoded in block sizes according to TrCHType and TTI (which is compliant with [1]).
    The processing unit of the turbo code encoder is one block. Each firing, BlockSize × 3 + 12 tokens are produced when BlockSize in and one CurSize tokens are consumed. The following table lists BlockSize values.
    BlockSize Values
    Downlink or Uplink Data Source BlockSize
    TTI_10 ms TTI_20 ms TTI_40 ms TTI_80 ms
    DCH_64kbps 656 1296 2576 2568
    DCH_128kbps 1296 2576 2576 3419
    DCH_256kbps 2576 2576 3419 4100
    DCH_512kbps 2576 3419 4100 4553
    DMCH_64_kbps   1296    
    DMCH_144_kbps   2896    
    DMCH_384_kbps   3848    
    DMCH_2048_kbps (uplink only)   4553    

References
  1. 3GPP Technical Specification TS 25.212 V3.0.0 "Multiplexing and channel coding (FDD)," October 1999.
  2. C. Berrou, A. Glavieux and P. Thitimajshima, "Near Shannon limit error-correcting coding and decoding: Turbo-codes," Ecole Nationale Superieure des Telecommunivations de Bretagne, France.
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