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WCDMA3G_UE_FixedRateDemod


Description: Downlink demodulation for measurement channels
Library: 3GPPFDD 10-99, User Equipment
Class: SDFWCDMA3G_UE_FixedRateDemod

Parameters

Name

Description

Default

Sym

Type

Range

DataType

measurement channel type: DTCH_12_2_kbps, DTCH_64_kbps, DTCH_144_kbps, DTCH_384_kbps

DTCH_12_2_kbps

 

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 searching 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

 

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 reference measurement channels 12.2/64/144/384 kbps [1] for user equipment in downlink.
    The schematic for this subnetwork is shown in the following figure. It includes the Rake receiver, spreading code and scrambling code generation, and BER measurement. This subnetwork takes the input symbol from In in chips and reference DPCH data from DPCHDataIn in radio frame (15 slots), and outputs the physical channel BER once every radio frame (15 slots).

    WCDMA3G_UE_FixedRateDemod 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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