3GPPFDD_RF_ACLR_SwitchingTransients
Description: 3GPP ACLR due to switching transients measurements
Library: 3GPPFDD, Measurement
Class: TSDF3GPPFDD_RF_ACLR_SwitchingTransients
Parameters
Name |
Description |
Default |
Unit |
Type |
Range |
|---|---|---|---|---|---|
SpecVersion |
version of specifications: Version_03_00, Version_12_00, Version_03_02 |
Version_12_00 |
|
enum |
|
RLoad |
input resistance |
DefaultROut |
Ohm |
real |
(0, ∞) |
RTemp |
temperature of resistor, in celsius |
DefaultRTemp |
|
real |
[-273.15, ∞) |
FCarrier |
frequency of carrier |
1950e6 |
Hz |
real |
[0, ∞) |
ExcessBW |
excess bandwidth of raised cosine filters |
0.22 |
|
real |
(0.0:1.0) |
SamplesPerChip |
samples per chip |
8 |
|
int |
[1:256] |
ScrambleCode |
index of scramble code |
0 |
|
int |
[0:16777215] |
ULScrambleType |
uplink scramble code type: LONG, SHORT |
LONG |
|
enum |
|
SpreadCode |
index of spread code |
0 |
|
int |
[0:255] |
SlotFormat |
slot format |
0 |
|
int |
[0:5 ] |
StartSlot |
number of slot to be ignored |
0 |
|
int |
[0, ∞) |
SlotNum |
number of slots measured |
1 |
|
int |
[0:100] |
SearchLength |
Search length |
.00001 sec |
sec |
real |
(0:(400.0/3840000)) |
SlotBoundary |
slot boundary in terms of sample |
0 |
|
int |
[0:MaxDelaySample]† |
† MaxDelaySample = int( (SearchLength + (16e-6/3.84))*3840000*SamplesPerChip*Ratio).
Ratio=if (SamplesPerChip>=16) then (1) else ( if(SamplesPerChip>=8) then (2) else (4) endif) endif.
Pin Inputs
Pin |
Name |
Description |
Signal Type |
|---|---|---|---|
1 |
RFin |
input RF signal |
timed |
Notes/Equations
- This subnetwork model is used to measure ACLR due to switching transients for a 3GPP FDD transmitter with four adjacent channels.
The schematic for this subnetwork is shown in the following figure.
3GPPFDD_RF_ACLR_SwitchingTransients Schematic
- The power level varies between consecutive slots; power level changes at different slots have a negative effect on ACLR performance.
A root-raised cosine filter is used in each channel. Adjacent channel offsets to the central frequency are +5, +10, −5, and −10 MHz. - Power is measured in the time domain by averaging power in the specified slots. The slots are aligned at a specified slot boundary using slot format and spreading code information.
- Use of this model is demonstrated in user equipment transmitter example: File > Example Project > WCDMA3G_UE_Tx_prj > UE_Tx_ACLR_SwitchingTransients.dsn. Simulation results are provided in Data Display windows for this design.