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WCDMA3G_SecondIntlvr


Description: Second interleaver
Library: 3GPPFDD 10-99, Channel Coding
Class: SDFWCDMA3G_SecondIntlvr

Parameters
Name Description Default Type Range
LinkDir link direction: Downlink, Uplink Downlink enum  
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 †
UL_DPDCHType uplink dedicated physical data channel type: DPDCH_15kbps, DPDCH_30kbps, DPDCH_60kbps, DPDCH_120kbps, DPDCH_240kbps, DPDCH_480kbps, DPDCH_960kbps DPDCH_30kbps enum  
† where
TF n = number of transmit format indicator bits
T n = number of transmit power control bits
P n = number of pilot bits
F n = number of feedback indicator bits

Pin Inputs

Pin

Name

Description

Signal Type

1

In

input data

int

Pin Outputs

Pin

Name

Description

Signal Type

2

Out

ouput data after interleaving

int

Notes/Equations
  1. This model is used to implement the second interleaving. The second interleaving is a block interleaver with inter-column permutations after the physical channel segmentation.
    Each firing, M tokens are produced when M tokens are consumed; refer to the following table for the value of M.
    M Values
    Physical Channel Type M=PhyCH Interleaving Block Length (Bits)
    DL_PhyCHType
    DPCH_15kbps_TF0_T2_P4 60
    DPCH_15kbps_TF2_T2_P4 30
    DPCH_30kbps_TF0_T2_P2 240
    DPCH_30kbps_TF2_T2_P2 210
    DPCH_30kbps_TF0_T2_P4 210
    DPCH_30kbps_TF2_T2_P4 180
    DPCH_30kbps_TF0_T2_P8 150
    DPCH_30kbps_TF2_T2_P8 120
    DPCH_60kbps_TF0_T2_P4 510
    DPCH_60kbps_TF2_T2_P4 480
    DPCH_60kbps_TF0_T2_P8 450
    DPCH_60kbps_TF2_T2_P8 420
    DPCH_120kbps_TF8_T4_P8 900
    DPCH_120kbps_TF0_T4_P8 900
    DPCH_240kbps_TF8_T4_P8 2100
    DPCH_240kbps_TF0_T4_P8 2100
    DPCH_480kbps_TF8_T8_P16 4320
    DPCH_480kbps_TF0_T8_P16 4320
    DPCH_960kbps_TF8_T8_P16 9120
    DPCH_960kbps_TF0_T8_P16 9120
    DPCH_1920kbps_TF8_T8_P16 18720
    DPCH_1920kbps_TF0_T8_P16 18720
    UL_DPDCHType
    DPDCH_15kbps 150
    DPDCH_30kbps 300
    DPDCH_60kbps 600
    DPDCH_120kbps 1200
    DPDCH_240kbps 2400
    DPDCH_480kbps 4800
    DPDCH_960kbps 9600
  2. Model functions
    Input bits and data length are read from the input buffer. The input bit sequence for second interleaving is denoted as up1, up2, ..., upU, where p is the PhyCH number and U is the number of bits in one radio frame for one PhyCH.
    The number of columns is set to C2 = 30. Columns are numbered 0,1,2, ..., C2 -1 left to right.
    The number of rows R2 is determined by finding the minimum integer R2 such that

    U ≤ R2 C2

    Bits input to the second interleaving are written into the R2 x C2 rectangular matrix row by row:

    Inter-column permutation is performed based on the pattern {P2(j)}(j=0,1, ..., C2 -1) shown in the following table, where P2(j) is the original column position of the jth permuted column.
    Permutation Patterns for Second Interleaving

    Number of Columns

    Inter-column Permutation Pattern

    30

    {0,20,10,5,15,25,3,13,23,8,18,28,1,11,21,6,16,26,4,14,24,19,9,29,12,2,7,22,27,17}
    After permutation f the columns, the bits are denoted by ypk:

    Output bit sequence ypk of the second interleaving is read column by column from the inter-column permuted R2 x C2 matrix. The output is pruned by deleting bits that were not present in the input bit sequence, that is, bit yp,k that corresponds to bits up,k with k > U are removed form the output. The bits after the second interleaving are denoted by vp1, vp2, ..., vpU,where vp1 corresponds to the bit ypk with smallest index k after pruning, vp2 to the bit ypk with second smallest index k after pruning, and so on.
    Data is output after interleaving.

References
  1. 3GPP Technical Specification TS25.212 V3.0.0,"Multiplexing and Channel Coding (FDD)," October 1999.
  2. 3GPP Technical Specification TS25.101 V3.0.0,"UE Radio Transmission and Reception (FDD)," October 1999.
  3. 3GPP Technical Specification TS25.104 V3.0.0,"UTRA (BS) FDD: Transmission and Reception," October 1999.
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