Application Note Template - Rohde & Schwarz · Application Note Products: | R&S CMW500 | R&S CMW-

<WCDMA TX measurements at around 0 dBm using ARB files on the R&S CMW 500> Application Note

Products:

| R&SCMW500

| R&SCMW-KW400

| R&SCMW-KM400

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Table of Contents

<1CM81_0E> Rohde & Schwarz < WCDMA TX measurements at around 0 dBm, using ARB files on the R&SCMW 500> 2

Table of Contents 1 Test Equipment Setup ........................................................... 4 1.1 R&S CMW500 WCDMA Arbitrary Waveform Playback Setup.................4 1.1.1 Step 1 – Enable the General Purpose RF Generator ................................4 1.1.2 Step 2 – Configure the General Purpose RF Generator ...........................4 1.1.3 Step 3 – Select the ARB File........................................................................5 1.1.4 Step 4 – Turn ON the General Purpose RF Generator..............................6 1.1.5 – Table of the General Purpose RF Generator Settings...........................7 1.1.6 Rohde & Schwarz WCDMA Non-signaling test arbitrary waveform

configuration.................................................................................................7 1.1.7 Rohde & Schwarz WinIQSIM2 control sequence ......................................8 1.1.7.1 Reset the tool................................................................................................8 1.1.7.2 Defining a TPC pattern with 24 zeros and 52 alternating bits, followed by

44 ones ..........................................................................................................9 1.1.7.3 Defining a the data list directory and write the TPC pattern to a file

e:\\0dBmPattern.dm_iqd ..............................................................................9 1.1.7.4 Defining the scrambling code.....................................................................9 1.1.7.5 Primary CPICH definition.............................................................................9 1.1.7.6 Secondary CPICH definition (inactive).......................................................9 1.1.7.7 Primary SCH definition ..............................................................................10 1.1.7.8 Secondary SCH definition .........................................................................10 1.1.7.9 Primary CCPCH definition .........................................................................10 1.1.7.10 Secondary CCPCH definition (inactive) ...................................................10 1.1.7.11 PICH definition............................................................................................10 1.1.7.12 AICH definition (inactive)...........................................................................11 1.1.7.13 AP_AICH definition (inactive)....................................................................11 1.1.7.14 PDSCH definition (inactive).......................................................................11 1.1.7.15 Downlink DPCCH definition (inactive) .....................................................11 1.1.7.16 DPCH definition ..........................................................................................11 1.1.7.17 Definition of all other channels (12 to 137)..............................................12 1.1.7.18 Marker definition.........................................................................................12 1.1.7.19 ARB Length.................................................................................................12 1.1.7.20 Query for the relative total power.............................................................12 1.1.7.21 Query for channel conflicts, syntax errors in the remote sequence ....12 1.1.7.22 Creation of the arbitrary waveform file ...................................................13

Table of Contents


1.1.8 R&S CMW500 Configuration for WCDMA Uplink Signal Measurement13 1.1.9 Multi Evaluation Settings...........................................................................14 1.1.10 RF Settings..................................................................................................14 1.1.11 Measurement Control ................................................................................17 1.1.11.1 Repetition ....................................................................................................17 1.1.11.2 Stop Condition............................................................................................18 1.1.11.3 Statistic Counts ..........................................................................................18 1.1.11.4 Measurement Length .................................................................................18 1.1.11.5 Preselected Slot..........................................................................................18 1.1.11.6 Assign View ................................................................................................19 1.1.12 Start the Measurement...............................................................................19 1.1.13 Measurement Results Screen Shots ........................................................20 1.1.14 Automating a WCDMA Measurement with the R&S CMW500..............22 1.1.14.1 Configure the arbitrary signal generator to play the waveform ............22 1.1.14.2 Configure the R&S CMW500 analyzer to make a WCDMA measurement

......................................................................................................................23 1.1.14.3 Arm the measurement ...............................................................................23 1.1.14.4 Get the modulation measurement results ...............................................23 1.1.14.5 Get the spectrum measurement results ..................................................24

2 Summary............................................................................... 24

3 References............................................................................ 24

Test Equipment Setup


1 Test Equipment Setup

1.1 R&S CMW500 WCDMA Arbitrary Waveform Playback Setup

The following details how to configure the CMW500 General Purpose RF Generator for playback of an arbitrary waveform used for WCDMA TX tests at a target power of 0 dBm. The waveform to execute playback on is:

• D:\Rohde-Schwarz\CMW\Data\waveform\RMC12_2_0dBm_0_9_08.wv

To start this arbitrary waveform file a software option KW400 on the R&S CMW500 is required

1.1.1 Step 1 – Enable the General Purpose RF Generator

1.1.2 Step 2 – Configure the General Purpose RF Generator



1.1.3 Step 3 – Select the ARB File

To select the arbitrary waveform, press the ARB soft key on left side of R&S CMW screen, followed by the “Select ARB File …” soft key on the bottom



Navigate through the pop up dialog, e.g. rotating the spin wheel and select the desired arbitrary waveform file by pushing the spin wheel. Navigate the focus of the dialog to the OK button by rotating the spin wheel again. After selecting the OK button push the spin wheel again

1.1.4 Step 4 – Turn ON the General Purpose RF Generator

To begin playing the arbitrary waveform, press the On/Off hard key button on the R&S CMW500 front panel, located along the top of the instrument, above the spin wheel.



1.1.5 – Table of the General Purpose RF Generator Settings

General Purpose RF Generator RF Configuration Parameter Settings Units

RF Routing User defined (suggest RF1 COM)

External Attenuation User defined (RF cable path loss) dB

Frequency 2112.4 MHz

Level (RMS) -65.0 dBm

Digital Gain 0.0 dB

List Mode Off

Baseband Configuration Baseband Mode ARB

Dual Tone Not applicable

ARB Configuration Repetition Continuous

ARB File Name D:\Rohde-Schwarz\CMW\Data\waveform\ RMC12_2_0dBm_0_9_08.wv

Trigger Retrigger Checked

Autostart Checked

Source Not applicable

List Configuration List Elements Not applicable

1.1.6 Rohde & Schwarz WCDMA Non-signaling test arbitrary waveform configuration

The waveform described below is useful for testing WCDMA chipsets in non-signaling test mode using the Rohde & Schwarz CMW500 Wideband Radio Communication Tester. The signal provides everything needed in a downlink signal for a non-signaling test mode enabled device to synchronize and decode on downlink channel 10562. The signal can be used to perform TX measurements on the R&S CMW 500. Changing the ARB file will cause the mobile to loose the synchronization. To prevent this, a multi-segment ARB generator mode is available on the R&S CMW500.



Uplink signal measurements from the chip can be performed using the R&S CMW500 WCDMA measurement option, KM400. Waveform file name: RMC12_2_0dBm_0_9_08.wv Waveform Content 80 millisecond long waveform (8 frames equal to 2 TTI)

DL Primary Scrambling Code 0

DL Secondary Scrambling Code 0

DPCH Channel Code 9

Channel type 12.2kbps RMC

Power Control Bits set all to ‘1’

P-CPICH Level -3.3 dB

P-SCH Level -8.3 dB

S-SCH Level -8.3 dB

P-CCPCH Level –5.3 dB

PICH Level -8.3 dB

DPCH Level -10.3 dB

1.1.7 Rohde & Schwarz WinIQSIM2 control sequence

The Rohde & Schwarz tool WinIQSIM2 can also be remote controlled to define the parameters, which are used to generate the arbitrary waveform file. The remote interface behaves like a standard remote interface of a signal generator based on a SCPI syntax using an VISA driver to control a TCP/IP connection to “localhost”. The leading “WinIQSIM: ” is not part of the command, this is only used as a address symbol in this Rohde & Schwarz remote script tools

1.1.7.1 Reset the tool

buffout = [ ] WINIQSIM2: *IDN? WINIQSIM2: *RST WINIQSIM2: *CLS WINIQSIM2: BB:W3GP:STAT OFF



1.1.7.2 Defining a TPC pattern with 24 zeros and 52 alternating bits, followed by 44 ones

1.1.7.3 Defining a the data list directory and write the TPC pattern to a file e:\\0dBmPattern.dm_iqd

1.1.7.4 Defining the scrambling code

The primary scrambling code is defined with 4 digits followed by the secondary scrambling code with 1 digit

1.1.7.5 Primary CPICH definition

1.1.7.6 Secondary CPICH definition (inactive)

WINIQSIM2: MMEM:CDIR 'e:\\' WINIQSIM2: MMEM:MDIR 'e:\\' WINIQSIM2: SOUR:BB:DM:DLIS:SEL "e:\\0dBmPattern" buffout = "SOUR:BB:DM:DLIS:DATA " + ilpc_tpc_pattern WINIQSIM2.write(buffout)

ilpc_tpc_pattern = "0" for index in range (0,23): ilpc_tpc_pattern = ilpc_tpc_pattern + ',0' for index in range (0,26): ilpc_tpc_pattern = ilpc_tpc_pattern + ',1,0' for index in range (0,44): ilpc_tpc_pattern = ilpc_tpc_pattern + ',1'

WINIQSIM2: BB:W3GP:BST1:CHAN1:STAT OFF WINIQSIM2: BB:W3GP:BST1:CHAN1:POW -3.3 WINIQSIM2: BB:W3GP:BST1:CHAN1:CCOD 7

WINIQSIM2: BB:W3GP:BST1:CHAN0:STAT ON WINIQSIM2: BB:W3GP:BST1:CHAN0:POW -3.3

WINIQSIM2.write('BB:W3GP:BST1:SCOD #H0000') WINIQSIM2: BB:W3GP:BST1:SCOD:STAT ON



1.1.7.7 Primary SCH definition

1.1.7.8 Secondary SCH definition

1.1.7.9 Primary CCPCH definition

1.1.7.10 Secondary CCPCH definition (inactive)

1.1.7.11 PICH definition

WINIQSIM2: BB:W3GP:BST1:CHAN6:STAT ON WINIQSIM2: BB:W3GP:BST1:CHAN6:POW -8.3 WINIQSIM2: BB:W3GP:BST1:CHAN6:CCOD 16 WINIQSIM2: BB:W3GP:BST1:CHAN6:DATA PN9 WINIQSIM2: BB:W3GP:BST1:CHAN6:TOFF 0

WINIQSIM2: BB:W3GP:BST1:CHAN5:STAT OFF WINIQSIM2: BB:W3GP:BST1:CHAN5:POW -5.3 WINIQSIM2: BB:W3GP:BST1:CHAN5:CCOD 4 WINIQSIM2: BB:W3GP:BST1:CHAN5:DATA PN9 WINIQSIM2: BB:W3GP:BST1:CHAN5:SFOR 4 WINIQSIM2: BB:W3GP:BST1:CHAN5:TOFF 0

WINIQSIM2: BB:W3GP:BST1:CHAN4:STAT ON WINIQSIM2: BB:W3GP:BST1:CHAN4:POW -5.3 WINIQSIM2: BB:W3GP:BST1:CHAN4:CCOD 1 WINIQSIM2: BB:W3GP:BST1:CHAN4:DATA PN9 WINIQSIM2: BB:W3GP:BST:ENH:PCCP:CCOD:STAT ON WINIQSIM2: BB:W3GP:BST:ENH:PCCP:STAT ON





1.1.7.12 AICH definition (inactive)

1.1.7.13 AP_AICH definition (inactive)

1.1.7.14 PDSCH definition (inactive)

1.1.7.15 Downlink DPCCH definition (inactive)

1.1.7.16 DPCH definition

The code channel is 9. It is using aRMC12.2 coded channel with transport format combination index 3. The data source is a PRBS-9 sequence TPC bits defined by data list e:\\ 0dBmPattern.dm_iqd WINIQSIM2: BB:W3GP:BST1:CHAN11:STAT ON WINIQSIM2: BB:W3GP:BST1:CHAN11:POW -10.3 WINIQSIM2: BB:W3GP:BST1:CHAN11:CCOD 9 WINIQSIM2: BB:W3GP:BST1:CHAN11:DATA PN9 WINIQSIM2: BB:W3GP:BST1:CHAN11:TOFF 0 WINIQSIM2: BB:W3GP:BST:ENH:CHAN11:DPCH:CCOD:TYPE M12K2 WINIQSIM2: BB:W3GP:BST:ENH:CHAN11:DPCH:CCOD:STAT ON WINIQSIM2: BB:W3GP:BST:ENH:CHAN11:DPCH:STAT ON WINIQSIM2: BB:W3GP:BST:ENH:CHAN11:DPCH:TCH1:DATA PN9 WINIQSIM2: BB:W3GP:BST1:CHAN11:DPCC:TFCI 3 WINIQSIM2: BB:W3GP:BST1:CHAN11:DPCC:TFCI:STATE ON WINIQSIM2: BB:W3GP:BST1:CHAN11:DPCC:TPC:DATA DLIS WINIQSIM2: BB:W3GP:BST1:CHAN11:DPCC:TPC:DATA:DSEL "e:\\0dBmPattern" WINIQSIM2: BB:W3GP:BST1:CHAN11:DPCC:TPC:READ CONT

WINIQSIM2: BB:W3GP:BST1:CHAN10:STAT OFF



WINIQSIM2: BB:W3GP:BST1:CHAN7:STAT OFF WINIQSIM2: BB:W3GP:BST1:CHAN7:POW -8.3 WINIQSIM2: BB:W3GP:BST1:CHAN7:CCOD 2



1.1.7.17 Definition of all other channels (12 to 137)

1.1.7.18 Marker definition

1 = ARB length 2 = ARB length 3 = Slot 4 = Frame

1.1.7.19 ARB Length

Defined with number of frames

1.1.7.20 Query for the relative total power

1.1.7.21 Query for channel conflicts, syntax errors in the remote sequence

WINIQSIM2: BB:W3GP:BST1:DCON? WINIQSIM2: SYST:ERR?

WINIQSIM2: BB:W3GP:SLEN 4 WINIQSIM2: BB:W3GP:STAT ON;*OPC?

WINIQSIM2: SOUR:BB:W3GP:TRIG:OUTP1:MODE CSP WINIQSIM2: SOUR:BB:W3GP:TRIG:OUTP2:MODE CSP WINIQSIM2: SOUR:BB:W3GP:TRIG:OUTP3:MODE SLOT WINIQSIM2: SOUR:BB:W3GP:TRIG:OUTP4:MODE RFR

for index in range (12, 138): buffout = "BB:W3GP:BST1:CHAN" + str(index) + ":STAT OFF" WINIQSIM2.write(buffout) buffout = "BB:W3GP:BST1:CHAN" + str(index) + ":POW 0.0" WINIQSIM2.write(buffout) buffout = "BB:W3GP:BST1:CHAN" + str(index) + ":TOFF 0" WINIQSIM2.write(buffout)

WINIQSIM2: BB:W3GP:POW?



1.1.7.22 Creation of the arbitrary waveform file

1.1.8 R&S CMW500 Configuration for WCDMA Uplink Signal Measurement

The following describes how to configure the R&S CMW500 to perform a measurement on the uplink WCDMA transmitter. First, enable the WCDMA TX Measurement option on, by checking its enable radio button from the Measurement Controller sub panel. This menu can be found by pressing the Measure hard key found along the top of the R&S CMW500 front panel, above the number keypad.

WINIQSIM2: SOUR:BB:W3GP:WAV:CRE "e:\RMC12_2_0dBm_0_9_08.wv " WINIQSIM2: SYST:ERR?



1.1.9 Multi Evaluation Settings

Next find and press the following soft key on from the R&S CMW500 WCDMA TX Measurement – Multi Evaluation screen. If this soft key is not yet visible, use the Tasks hard key.

The Tasks hard key shows the available currently enabled (loaded) software features and to select this feature. Press the soft key “WCDMA Multi Eval.”

The displayed soft keys row along the bottom of the LCD display should change to one of the WCDMA Multi Evaluation controls like shown below.

1.1.10 RF Settings

Press the “Config…” on the right side of the displayed soft keys row along the bottom of the LCD display. You should see the shown pop up menu now.



The following screen shots detail how to configure the following parameters to these values:



WCDMA Measurements RF Configuration Parameter Settings Units

RF Routing User defined (suggest RF1 COM)

External Attenuation User defined (RF cable path loss) dB

Frequency 1922.4 MHz

Expected Power Level (RMS) 23.0 dBm

User Margin 6.0 dB

List Mode Off

Trigger Trigger Source 'GPRF Gen1: Restart Marker'

Trigger Timeout 2000 (default) msec.

Minimum Trigger Gap 25 (default) µsec.

Multi Evaluation Configuration Measurement Length 1 slot

Statistic Counts Power 1 Slot

Modulation 5 Slots

ACLR Spectrum 10 Slots

Spectrum Emission Mask 10 Slots

BER Not applicable Blocks

List Configuration List Elements Not applicable

Press the soft key “Config…” again to come back to the measurement screen. The R&S CMW500 LCD screen should look like the following:



1.1.11 Measurement Control

Find and press the following soft key on the right-hand column of the LCD screen.

Configure the remaining parameters by manipulating the soft keys as such:

1.1.11.1 Repetition

Set the repetition mode to “Continuous”



1.1.11.2 Stop Condition

Set the stop condition to “None”

1.1.11.3 Statistic Counts

1.1.11.4 Measurement Length

1.1.11.5 Preselected Slot



1.1.11.6 Assign View

Press the soft key “Assign Views…” to select the TX measurements of your interest.

1.1.12 Start the Measurement

The measurement can be manually executed (triggered) by pressing the ON/OFF hard key on the front panel of the R&S CMW500, located along the top of the instrument, above the spin wheel.



1.1.13 Measurement Results Screen Shots

A successful WCDMA multi-evaluation measurement on the R&S CMW500 should look something like found on the following screen shot.

Find and press the following soft key on the right-hand column of the LCD screen.

In combination with the soft key “Select View” on the bottom of the display more details for single TX measurements can be visualized.

The following screen shots demonstrate such measurement views



This arbitrary waveform file in combination with the setting of the “preselected slot” of the WCDMA TX measurements can also be used to determine TX modulation results depending on the output power of the mobile phone. A preselected slot number 14 measures for example the uplink signal 14 dB below the max power



1.1.14 Automating a WCDMA Measurement with the R&S CMW500

The following SCPI command code is an example of how to configure the R&S

CMW500 signal generator and signal analyzer to perform a non-signaling WCDMA uplink TX measurement on non signaling enabled WCDMA chipset. The leading “CMW: ” is not part of the command, this is only used as a address symbol in Rohde & Schwarz remote script tools.

1.1.14.1 Configure the arbitrary signal generator to play the waveform

Whenever loading an ARB file, you should ensure it was present on the selected path. The verification can be achieved by querying the currently loaded ARB file. A return string "No File Selected" would be an indication, that the file is not present.



1.1.14.2 Configure the R&S CMW500 analyzer to make a WCDMA measurement

1.1.14.3 Arm the measurement

1.1.14.4 Get the modulation measurement results

CMW: FETC:WCDM:MEAS:MEV:MOD:AVER?

CMW: INIT:WCDM:MEAS:MEV;*OPC?

CMW: ROUT:WCDM:MEAS:RFS:CONN RF1C CMW: CONF:WCDM:MEAS:RFS:EATT 1 CMW: CONF:WCDM:MEAS:RFS:FREQ 1922.4e6 CMW: CONF:WCDM:MEAS:RFS:ENP 24 CMW: CONF:WCDM:MEAS:RFS:UMAR 6 CMW: CONF:WCDM:MEAS:UES:SCOD 0 CMW: CONF:WCDM:MEAS:UES:SFOR 0 CMW: CONF:WCDM:MEAS:UES:ULC WCDMA CMW: CONF:WCDM:MEAS:UES:DPDC ON CMW: CONF:WCDM:MEAS:MEV:REP SING CMW: CONF:WCDM:MEAS:MEV:RES:ALL ON,ON,ON,ON,ON,ON,OFF,OFF,OFF,OFF,OFF,ON,ON,OFF,OFF,OFF,OFF,OFF CMW: CONF:WCDM:MEAS:MEV:MSC 120 CMW: CONF:WCDM:MEAS:MEV:PSLot 45 CMW: CONF:WCDM:MEAS:MEV:SCO:SPEC 10 CMW: CONF:WCDM:MEAS:MEV:SCO:MOD 5 CMW: CONF:WCDM:MEAS:MEV:MPER:MOD FULL CMW: TRIG:WCDM:MEAS:MEV:SOUR 'GPRF Gen1: Restart Marker'

CMW: ROUT:GPRF:GEN1:RFS:CONN RF1C CMW: SOUR:GPRF:GEN1:BBM ARB CMW: SOUR:GPRF:GEN1:RFS:FREQ 2112.4e6 CMW: SOUR:GPRF:GEN1:RFS:EATT 1 CMW: SOUR:GPRF:GEN1:RFS:LEV -65 CMW: SOUR:GPRF:GEN1:ARB:FILE 'd:\\Rohde-Schwarz\\CMW\\data\\waveform\\ RMC12_2_0dBm_0_9_08.wv'CMW: SOUR:GPRF:GEN1:ARB:FILE? CMW: SOUR:GPRF:GEN1:ARB:REP CONT CMW: TRIG:GPRF:GEN1:ARB:RETR ON CMW: TRIG:GPRF:GEN1:ARB:AUT ON CMW: SOUR:GPRF:GEN1:LIST OFF CMW: SYST:ERR? CMW: SOUR:GPRF:GEN1:STAT ON;*OPC?

Summary


1.1.14.5 Get the spectrum measurement results

2 Summary The application note explains how to create and use an arbitrary waveform file to perform WCDMA transmitter tests at a target power of around 0 dBm for a non-signaling test mode enabled device.

3 References [1] User manual of the R&S CMW 500 or R&S CMW 280 radio communication

tester. [2] Software manual for the R&S WinIQSim Simulation Software [3] Software manual for the R&SWinIQSim Options xxx-K42/ -K242/ -K43/ -

K243/ -K45/ -K245/ -K59/ -K259/ -KW401/ -KW402 3GPP FDD, HSDPA, HSUPA and HSP

Index AArm the WCDMA Measurement............................................... 23 Automating a WCDMA Measurement ...................................... 22

CConfigure the ARB generator................................................... 22 Configure the GPRF Generator.................................................. 4 Configure the WCDMA analyzer .............................................. 23

EEnable the GPRF Generator...................................................... 4

G

Get the WCDMA modulation measurement results .................. 23 Get the WCDMA spectrum measurement results..................... 24

M

Measurement Control .............................................................. 17

Multi Evaluation Settings ..........................................................14

R

RF Settings of the WCDMA Measurement................................14

SSelect the ARB File ....................................................................5 Select View ..............................................................................20 Start the WCDMA Measurement ..............................................19

TTable of the GPRF Generator Settings .......................................7 Turn On the GPRF Generator..................................................6,8

WWCDMA Measurement Result Screen Shot..............................20 WCDMA Uplink Measurements ................................................13

CMW: FETC:WCDM:MEAS:MEV:SPEC:AVER?

About Rohde & Schwarz Rohde & Schwarz is an independent group of companies specializing in electronics. It is a leading supplier of solutions in the fields of test and measurement, broadcasting, radiomonitoring and radiolocation, as well as secure communications. Established 75 years ago, Rohde & Schwarz has a global presence and a dedicated service network in over 70 countries. Company headquarters are in Munich, Germany.

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This application note and the supplied programs may only be used subject to the conditions of use set forth in the download area of the Rohde & Schwarz website.

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