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