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WCDMA3G_UE_VariableRateDemod


Description: Downlink demodulation for variable-rate source
Library: 3GPPFDD 10-99, User Equipment
Class: SDFWCDMA3G_UE_VariableRateDemod

Parameters
Name Description Default Sym Type Range
DataType information rate type: INFO_8_kbps, INFO_16_kbps, INFO_32_kbps, INFO_64_kbps, INFO_128_kbps, INFO_256_kbps, INFO_512_kbps INFO_8_kbps   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 DPCH_30kbps_TF2_T2_P8   enum
ScramblingCodeIndex scrambling code index 0   int [0, 8191]]
SampleRate number of samples per chip 8 S int [1, 32]]
PathNum number of paths 1 L int [1, 16]]
MaxDelay maximum path delay in terms of chips 20 D int [0, 1280]]
SearchDir path search direction based on current timing: Forward, Backward, Bidirection Backward   enum  
EstMethod channel estimation method: Averaging, Interpolation, WMSA, NoEst Interpolation   enum  
SF1 spreading factor for user1: SF1_4 , SF1_8 , SF1_16, SF1_32, SF1_64, SF1_128, SF1_256, SF1_512 SF1_256   enum  
SF2 spreading factor for user2: SF2_4 , SF2_8 , SF2_16, SF2_32, SF2_64, SF2_128, SF2_256, SF2_512 SF2_256   enum  
SF3 spreading factor for user3: SF3_4 , SF3_8 , SF3_16, SF3_32, SF3_64, SF3_128, SF3_256, SF3_512 SF3_256   enum  
SF4 spreading factor for user4: SF4_4 , SF4_8 , SF4_16, SF4_32, SF4_64, SF4_128, SF4_256, SF4_512 SF4_256   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

complex

2

DPCHDataIn

input bits for DPCH data fields

int

Pin Outputs

Pin

Name

Description

Signal Type

3

Out

output data

real

4

PhyCHBER

output physical channel BER value

real

Notes/Equations
  1. This subnetwork is used to demodulate the input complex symbol to calculate the physical channel BER (bit error rate) for variable-rate sources ranging from 8 to 512 kbps for the user equipment in a downlink.
    The schematic for this subnetwork is shown in the following figure. It includes the Rake receiver, spreading code and scrambling code generation, and the BER measurement. This subnetwork takes the input symbol from In in chips and reference DPDCH data from DPDCHDataIn in radio frame (15 slot), outputs the demodulation data in radio frames and the physical channel BER once every radio frame (15 slots).

    WCDMA3G_UE_VariableRateDemod Schematic

References
  1. 3GPP Technical Specification TS 25.101 V3.2.0 "UE: Radio transmission and Reception (FDD)," March 2000.
  2. 3GPP Technical Specification TS 34.121 V3.0.1 "Radio transmission and reception (FDD)," March 2000.
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