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3GPPFDD_RF_EVM



Description: 3GPP EVM measurements
Library: 3GPPFDD, Measurement
Class: TSDF3GPPFDD_RF_EVM

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, ∞)

ExcessBW

excess bandwidth of raised cosine filters

0.22

 

real

(0.0:1.0)

FilterLength

length of raised cosine filters in number of symbols

16

 

int

[1:inf]

SamplesPerChip

samples per chip

8

 

int

[1:256]

LinkDir

link direction: Downlink, Uplink

Uplink

 

enum

 

ScrambleCode

index of scramble code

0

 

int

[0:511] for downlink;
[0:16777215] for uplink

ULScrambleType

uplink scramble code type: LONG, SHORT

LONG

 

enum

 

ScrambleOffset

scramble offset in downlink channels

0

 

int

[0:15]

DLScrambleType

downlink scramble code type: Normal, RightAlternate, LeftAlternate

Normal

 

enum

 

SpreadCode

index of spread code

0

 

int

[0:255] for uplink DPCCH;
[0:SF-1] for downlink;
SF is set by SlotFormat

SlotFormat

slot format

0

 

int

[0:5] for uplink DPCCH;
[0:16 ] for downlink DPCH

StartSlot

number of slot to be ignored

0

 

int

[0, ∞)

SlotNum

number of slots measured

1

 

int

[1:15]

SCH

switch for SCH: OFF, ON

ON

 

enum

 

CPICH

switch for CPICH: OFF, ON

OFF

 

enum

 

DUT_DelayBound

Search length

.00001 sec

sec

real

(0:(400.0/3840000))

EVMValue

EVM value expression options: EVM_Ratio, EVM_Percent

EVM_Percent

 

enum

 

Correct_IQ_Offset

switch for IQ offset correction: NO, YES

YES

 

enum

 

Pin Inputs

Pin

Name

Description

Signal Type

1

RFin

input RF signal

timed

2

RefIn

reference signal for EVM

complex

Notes/Equations
  1. This subnetwork model is used to measure EVM for 3GPP FDD transmitter.
    EVM is measured by comparing the reference signals with the signals to be tested. Root-raised cosine filtering is performed before each test and reference signal.
    The schematic for this subnetwork is shown in the following figure.

    Schematic of 3GPPFDD_RF_EVM
  2. Refer to 3GPPFDD_EVM_NonSyn for more information.
  3. Use of this model is demonstrated in base station and user equipment transmitter examples: File > Example Project > WCDMA3G > WCDMA3G_BS_Tx_prj > BS_Tx_EVM.dsn and WCDMA3G_UE_Tx_prj > UE_Tx_EVM.dsn. Simulation results are provided in Data Display windows for these designs.
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