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3GPPFDD_DL_BCH



Description: 3GPP downlink reference BCH measurement channel
Library: 3GPPFDD, Base Station
Class: SDF3GPPFDD_DL_BCH
Derived From: 3GPPFDD_DLRefCHBase

Parameters

Name

Description

Default

Unit

Type

Range

SpecVersion

version of specifications: Version_03_00, Version_12_00, Version_03_02

Version_12_00

 

enum

 

ScrambleCode

index of scramble code

0

 

int

[0:512] for downlink;
[0:16777215] for uplink

BCHDataPattern

BCH source data pattern: BCH_random, BCH_PN9, BCH_PN15, BCH_bits_repeat, BCH_user_file

BCH_random

 

enum

 

BCHRepBitValue

BCH repeating data value

0xff

 

int

[0:255]

BCHUserFileName

BCH user-defined data file name

datafile.txt

 

filename

 

Pin Outputs

Pin

Name

Description

Signal Type

1

out

non STTD

complex

2

STTDout

STTD

complex

3

BCH

BCH data out

int

Notes/Equations
  1. This subnetwork model is used to generate the baseband signal of DL BCH channel. The schematic for this subnetwork is shown in the following figure.

    3GPPFDD_DL_BCH Schematic
  2. Parameters for DL BCH channel are specified in the following table.
    BCH Parameters

    Parameter

    DL BCH

    Transport block size

    246

    CRC

    16 bits

    Coding

    CC, coding rate = 1/2

    TTI

    20 ms

    Number of codes

    1

    SF

    256

  3. Channel coding is illustrated in the following figure. After channel coding, the signal of each slot is spread and scrambled, then output at pin out (non STTD). Pin STTDout outputs the signal with STTD encoding.
  4. This subnetwork model also provides original transport source bits through pin BCH that can be used in BER measurements.

    Channel Coding for BCH

References
  1. 3GPP Technical Specification TS 25.944 V3.1.0, "Channel coding and multiplexing examples" Release 1999.
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