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; |
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
- 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
- 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
- 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.
- This subnetwork model also provides original transport source bits through pin BCH that can be used in BER measurements.
Channel Coding for BCH
References
- 3GPP Technical Specification TS 25.944 V3.1.0, "Channel coding and multiplexing examples" Release 1999.