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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
  1. 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
  2. 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.
  3. 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.
  4. 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.
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