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Medições emReceptores de TV
Digital ISDB-TbAbril. 2014
Cyro Hemsi
Eng. Agilent
Agenda
• DTV Receivers - Laboratory Tests
• Signal & interference - Field Tests
• Summary
Satellite TV• DVB-S/S2• DirectTV
• ISDB-S
• ABS-S
Digital Video/Broadcast Audio Landscape – Technology Standards Worldwide
Set-Top-Box
Cable TV• DVB-C/C2
• ITU J.83B
• ISDB-C
• DOCSIS
Terrestrial TV• DVB-T/T2
• ISDB-T/Tmm• ATSC
• DTMB(CTTB)
Mobile TV• DVB-H
• DVB-SH
• ISDB-T 1-Seg• CMMB
• T-DMB
• S-DMB
• ATSC-M/H
• DVB-T2 Lite
Broadcast Audio• AM/FM
• FM Stereo/RDS
• DAB/DAB+
• ISDB-TSB
• HD Radio
• XM
• DRM/DRM+
• CDR
RussiaDVB-T/T2European
DVB-T/H/T2
DVB-SH/S/S2
DVB-C/C2
DAB/DAB+
DRM/DRM+
Brazil, ArgentinaDVB-S/S2
ISDB-T/TB
USAATSC・・・・ATSC-M/H
DVB-S/S2
DirectTV
XM Radio
HD radio(IBOC)
J83.Annex-B
KoreanATSC
T-DMB
S-DMB
ChinaDTMB/CMMB
ABS-S
AustraliaDVB-T
DAB/DAB+
VietnamThailandDVB-T/T2
Worldwide Digital Video & Audio Broadcasting
JapanISDB-T/TSB/Tmm
ISDB-S
ISDB-C
Hong KongDTMB, CMMB
South AfricaDVB-T/T2
Analo
g V
ideo
MP
EG
Encodin
g
Modula
tion I
/Q
RF
Sig
nal U
pc
Transmitter
RF Analysis
Modulation Analysis
MPEG Analysis
Video AnalysisR
F S
ignal D
ow
nc
Dem
odula
tion
MP
EG
Str
eam
Vid
eo D
ispla
y
Receiver
Tra
nsm
issio
n C
hannel
MPEG Streaming
Video Sig Gen
RF Gen.
I/Q Modulation
Digital Video Typical Transmission System
Our focus
today
Tx Test
Analyzers
Rx Test
Sources
Testing Receivers for ‘real’ Radio/ Transmission Channel impacts-interference…
Intentional radiators • Broadcast radio and television
• Cellular
• Satellite
• Radar
• Mobile radio
• WLAN
• Cordless phones
Active interference
sources
0 deg
90 deg
IF LO
I/Q Demodulator
ADC BB FilterSymbol
Decoder
I
Q
Receiver
Received signal
Internal Noise
IQ Impairments
-Imbalance
-Offset
-Time delay
Incorrect Coefficients
DAC/DSP Error
Phase & amplitude
flatness
Distortion/ spurious
Internal Noise
Phase & amplitude
flatness
Demod algorithmsPhase & amplitude
flatness
RF Filter IF Amp
RF LO
LNA
IF Filter
RF
Frequency
stability
Receiver performance ‘real’ challenges
Freq. stability
Receiver
Gain
Noise Figure
Phase Noise
Spurious
Conversion Loss
Noise Figure
RF Filter IF Amp
RF LO
LNA
IF Filter0 deg
90 deg
IF LO
I/Q Demodulator
ADC BB FilterSymbol
Decoder
I
Q
RF
Subjective Video quality
Or Chipset BER report
Receiver MER (BB)
Multi-tone distortion
Test (amplitude flatness)
Phase Noise
Receiver Test & Measurements toolsLaboratory Tests
Amplitude flatness
Phase Noise
Noise Figure
Receiver MER (RF)
With impairments:
- Interference (LTE,…)
-AWGN Noise
-Phase noise plateau
Signal generation
Subjective Video quality
Or Chipset BER report
Receiver RF Front End MeasurementsIn-/Out of- Band Spectrum
Test objectives
Verify RF signal and noise power amplitude and
frequency after LNB
Test requirements
Signal generator, ISDB-T Signal creation SW,
spectrum analyzer
Test results
Signal and noise spectrum, channel power, OBW,
ACP, Spurious
Test setup
Next slide
Receiver RF Front End MeasurementsIn-/Out of- Band Spectrum
EXG/ MXG Signal Generator
MXA Signal Analyzer
10 MHz Reference
RF Input
RF Filter IF Amp
RF LO
LNA
IF Filter
LNB/ RF Front-end
N7623B Signal Studio for Digital TV
Signal and Noise Power vs. frequency
Receiver RF Front End MeasurementsIn-/Out of- Band Spectrum
Channel Power
Occupied Bandwidth
Adjacent Channel Power
Spectral Mask
Receiver RF Front End MeasurementsAmplitude Flatness
Test objectives
Verify amplitude response linearity of LNB, over modulated
signal bandwidth
Test requirements
Signal generator, Multi-tone distortion Signal creation SW,
spectrum analyzer
Test results
LNB amplitude response over entire OBW using a
corrected multi-tone stimulus as input
Test setup
Next slide
Receiver RF Front End MeasurementsAmplitude Flatness
EXG/ MXG Signal Generator
MXA Signal Analyzer
10 MHz Ref.LAN
RF Input
Signal Studio for Multi-tone Distortion
RF Filter IF Amp
RF LO
LNA
IF Filter
LNB/ RF Front-end
Initial
Calibration
Receiver RF Front End MeasurementsAmplitude Flatness
Issues
• Errors will manifest themselves as EVM
• Important because ISDB-T 6 MHz wide BW
• Need to test individual components, i.e.
Amplifiers, Filters, Mixers, etc
How to test
• Using multi-tone signals
– Space tones over BW of interest
– Correction techniques enable with
flatness of a few tenths of a dBSignal Studio for Multitone Distortion
Receiver RF Front End MeasurementsAmplitude Flatness
Multi-tone Performance with Corrections
• 50 Tones
• Spaced over 100 MHz
Before Corrections After Corrections
Note: Scale per div is 0.2 dB in each graph Corrected flatness is a few tenths of a dB!
Receiver RF Front End MeasurementsNoise Figure
Test objectives
Verify incremental noise produced inside the LNB (amplifiers, mixers, filters)
Test requirements
Signal generator, Calibrated noise source, spectrum analyzer, Noise Figure Msmt. Application
SW
Test results
Noise Figure measurement
Test setup
Next slide
160
150
140
130
120
110
100
90
80
70
60
Input
Output
Signal/Noise Degradation
CF = 850 MHz Span = 100 MHz
dB
m
Receiver RF Front End MeasurementsNoise Figure
(S/N)in
(S/N)out
• Multiplied S/N ratio degradation effect due to cascading amplifiers
- Lower NF reduces bit error rate in digital receivers;- Lower NF allows smaller antennas: 1dB reduction in NF has approximately the same effect as increasing the antenna diameter by 40%.
Receiver RF Front End MeasurementsNoise Figure
Receiver RF Front End MeasurementsNoise Figure
MXA Signal Analyzer
RF Input
RF Filter IF Amp
RF LO
LNA
IF Filter
LNB/ RF Front-end
Noise Source
N9069A Noise Figure Msmt. Appl.
EXG/ MXG Signal Generator
S/N in
S/N out
Receiver RF Front End MeasurementsPhase Noise
Test objectives
Verify the quality of LNB local oscillator signals, used for
down-convertion
Test requirements
Signal generator, spectrum analyzer, Phase Noise Msmt. Application SW
Test results
Phase Noise measurement
Test setup
Next slide
Receiver RF Front End MeasurementsPhase Noise
EXG/ MXG Signal Generator
MXA Signal Analyzer
10 MHz Reference
RF Input
RF Filter IF Amp
RF LO
LNA
IF Filter
LNB/ RF Front-end
N9068A Phase Noise Msmt. Appl.f0
f0
-Evaluate stability of local oscillators in the RF Front-end-Measure Phase noise for multiple frequency offsets in Log Plot or at Spot frequencies
Receiver RF Front End MeasurementsPhase Noise
Receiver RF Front End MeasurementsSensitivity/ dynamic range
Test objectives
Verify the sensitivity/ dynamic range of the receiver
Test requirements
Signal generator, ISDB-T Signal generation SW, spectrum analyzer, N6155A ISDB-T
Measurement Application, MER, HDTV receiver, Chipset BER
Test results
Sensitivity level by reducing the input power, measuring Subjective video quality
Test setup
Next slide
Receiver Baseband MeasurementsSensitivity/ dynamic range
EXG/ MXG Signal Generator
N7623B Signal Studio for Digital TV
Subjective Video Quality/ MER
0 deg
90 deg
IF LO
I/Q Demodulator
ADC BB FilterSymbol
Decoder
I
Q
RF Filter IF Amp
RF LO
LNA
IF Filter
MXA Signal Analyzer
N6155A
with analog BBIQ opt.
Chipset BER
Optional
RF/ Baseband
Modulation Error Rate (MER) Digital Modulation Analysis
64 QAM ConstellationQ
I
Random Noise
Phase Noise
AM Distortion
PM Distortion
Delay Distortion/ISI
Interference
Ideal Symbol Point
Receiver RF Front End MeasurementsIncreased Phase Noise
Test objectives
Verify the Rx demodulation quality with increased Phase noise produced by the generator
Test requirements
Signal generator, ISDB-T Signal generation SW, spectrum analyzer, N6155A ISDB-T
Measurement Application, MER, HDTV receiver, Chipset BER
Test results
Demodulation quality vs. increased Phase Noise, measuring Subjective video quality
Test setup
Next slide
Receiver Baseband MeasurementsIncreased Phase Noise (under impairment)
N7623B Signal Studio for Digital TV
0 deg
90 deg
IF LO
I/Q Demodulator
ADC BB FilterSymbol
Decoder
I
Q
RF Filter IF Amp
RF LO
LNA
IF Filter
Chipset BER
Subjective Video Quality/ MER
N6155A
MXA Signal Analyzerwith analog BBIQ opt.
EXG/ MXG Signal Generator
Optional
RF/ Baseband
+ Phase Noise
Pedestal Phase Noise Set at -90 dBc/Hz
MXG non-impaired phase noise characteristic at -125 dBc/Hz
N5182A MXB Phase Noise Plots
Receiver Baseband MeasurementsIncreased Phase Noise
Receiver RF Front End MeasurementsSynchronization range
Test objectives
Verify the Rx demodulation quality varying the received frequency range using the generator
Test requirements
Signal generator, ISDB-T Signal generation SW, spectrum analyzer, N6155A ISDB-T
Measurement Application, MER, HDTV receiver, Chipset BER
Test results
Demodulation quality vs. increased synchronization range, measuring Subjective video quality
Test setup
Next slide
Receiver Baseband MeasurementsSynchronization range (under impairment)
N7623B Signal Studio for Digital TV
0 deg
90 deg
IF LO
I/Q Demodulator
ADC BB FilterSymbol
Decoder
I
Q
RF Filter IF Amp
RF LO
LNA
IF Filter
Chipset BER
Subjective Video Quality/ MER
N6155A
MXA Signal Analyzerwith analog BBIQ opt.
EXG/ MXG Signal Generator
Optional
RF/ Baseband
+ Freq offset
Receiver RF Front End MeasurementsSelectivity (digital)
Test objectives
Verify the Rx demodulation quality increasing adjacent/ co-channel digital interfering signal and
AWGN powers using the generator
Test requirements
Signal generator, ISDB-T Signal generation SW, spectrum analyzer, N6155A ISDB-T
Measurement Application, MER, HDTV receiver , Chipset BER
Test results
Demodulation quality vs. increased interfering signal and AWGN powers, measuring Subjective
video quality
Test setup
Next slide
Interfering Signals
• Digital and analog signals
• Can receiver correctly reject interfering carriers?
• Selectivity tests
• Blocking tests
• NEW: LTE @ 700MHz
Receiver Baseband MeasurementsSelectivity
Receiver Baseband MeasurementsSelectivity
0 deg
90 deg
IF LO
I/Q Demodulator
ADC BB FilterSymbol
Decoder
I
Q
RF Filter IF Amp
RF LO
LNA
IF Filter
Adjacent/ co-channel digital interfering signal, AWGN
Chipset BER
Subjective Video Quality/
MER
N6155A
MXA Signal Analyzerwith analog BBIQ opt.
EXG/ MXG Signal Generator
N7623B Signal Studio
for Digital TV
N7625B Signal Studio for LTE
Optional
RF/ Baseband
April 17, 2014
Confidentiality Label
34
LTE Co-existence with DTV @ 700MHzMigration Plan
Example - LTE Co-existence with DTV @ 700MHz
Measurement result of minimum sensitivity level of DTV due to interference from LTE UE in US band plan
※ Measured LTE UE ACLR
LTE UE channel
BandwidthACLR 1 ACLR 2
3MHz 51 dB 69.3 dB
5MHz 34.9dB 54.1 dBFrom Samsung
Receiver RF Front End MeasurementsI/Q impairments
Test objectives
Verify the Rx demodulation quality varying I/Q impairments using the generator
Test requirements
Signal generator, ISDB-T Signal generation SW, spectrum analyzer, N6155A ISDB-T
Measurement Application, MER, HDTV receiver, Chipset BER
Test results
Demodulation quality vs. increased I/Q impairments, measuring Subjective video quality
Test setup
Next slide
Receiver Baseband MeasurementsI/Q (under impairment)
MXG Signal Generator
N7623B Signal Studio for Digital TV
0 deg
90 deg
IF LO
I/Q Demodulator
ADC BB FilterSymbol
Decoder
I
Q
RF Filter IF Amp
RF LO
LNA
IF Filter
Gain Imbalance
Quadrature Error
DC Offset
Chipset BER
N6155A
MXA Signal Analyzerwith analog BBIQ opt.
Optional
RF/ Baseband
Subjective Video Quality/
MER
+ IQ Impairments
Ideal(square)
Measured(rectangle)
IQ Constellation
QPSK Summary Table
Gain Imb. = 1.02 dB
(Ideally 0 dB)
Receiver Baseband MeasurementsI/Q impairments
Ideal(square)
Measured(parallelogram)
IQ Constellation
QPSK Summary Table
Quad. Error = 5.9 deg.
(Ideally 0 deg*)
* meaning that I and Q are ideally 90 deg. apart
Receiver Baseband MeasurementsI/Q impairments
Ideal(square)
Measured(square)
IQ Constellation
QPSK Summary Table
IQ Offset = -22 dB
(Ideally < -60dB)
Receiver Baseband MeasurementsI/Q impairments
Constelação com MER = 35dB
Constelação com MER = 25dB
Constelação com MER = 15dB
Agenda
• DTV Receivers - Laboratory Tests
• Signal & interference - Field Tests
• Summary
Ambient Man-Made Radio Noise
Frequency (Hz)
Me
dia
n N
ois
e a
bo
ve
kT
B (
dB
) Antenna connected
Input terminated
Interference Classifications• In-band interference
• Co-channel interference
• Out-of-band interference
• Adjacent channel interference
• Uplink interference
• Downlink interference
In-Band and Co-Channel Interference
Causes:
Two different communication systems
at same frequency band
Out-of-Band Interference
Causes:
improper filtering, non-linearity and/or leakage
Adjacent Channel Interference
Channel power Adjacent channel power
Causes:
generated by modulation, switching transients, and
intermodulation distortion
Downlink and Uplink Interference
Interference
Interference
Uplink spectrogramDownlink spectrogram
frequency channel re-use, co-located transmitters
Near-Far Conditions
Analyzer display
All signals enter analyzer’s front-end
Potential overload ofanalyzer’s front-end
f2
f1
f1 f2
two or more wireless services operatorsat adjacent channels
Key Analyzer Specifications
Frequency range
Displayed Average Noise Level
(DANL)
Also,
• RBW filter
• Preamplifier
• Third order intercept
• Phase noise
• Spurious
RBW and PreamplifierLower RBW improves DANL Preamp ON
Wideband
signal
Narrowband
signal
Narrow-band signals (BW < RBW)
Wide-band signals (BW > RBW)
RBW=1 kHz
RBW=100 Hz
Preamp ON
RBW=1KHz
Same signal level, lower DANL (improve SNR)
Lower signal level, lower DANL (same SNR)
Reducing RBW:
Preamp OFF
Antenna Configurations
Antenna connected directly
Omnidirectional
Antenna cabled to analyzer
High gain
Horizontal plane
Vertical plane
Horizontal plane
Vertical plane
Omni
High gain
Antenna patterns
High Gain versus Omnidirectional Antenna Types
Yagi
Whip
Amplitude Correction and Field Strength
Amplitude correction = antenna gain - cable loss
Correction factors editorCorrections .csv
Field strength units
FieldFox
Clear/Write and Max Hold Display Modes
Max hold trace
Frequency hopping
carrierFixed carrier
Spectrogram Display Mode
Time
Frequency
Amplitude scale
Frequency hopping
carrier
Fixed carrier
Zero Span Display Mode
Time
Trigger LevelDuration of Signal @ fcenter
Cable and Antenna Measurement Basics
Distance to Fault Measurements
Return loss in frequency
domain
Return loss in
time domain
Frequency span
Distance
Inverse FFT
Cable Loss: 1-Port and 2-Port Insertion Loss
1-port cable loss- Cal ready- Measure return loss of the
cable and save it to memory- Connect short or leave it
open at end of cable- Enable DATA-TRACE
2-port insertion loss- Mechanical 2-port cal- Measure insertion loss
2-port insertion is more
accurate, but 1-port
cable/insertion loss has
adequate accuracy for long
cable measurement where 2-
port measurements cannot be
performed
VNA Architecture and Features
• 4-receiver architecture
• Calibration supported:• CalReady and QuickCal
• 1 port calibration, Full 2 port calibration, unknown thru calibration, QSLOT, Waveguide Calibration and TRL
• Response and enhanced response
• User defined cal kit
• Measurements:• S-parameters (mag and phase)
• Group delay, electrical delay, port extension
• Smith chart, polar chart, impedance
Filter / Diplexer Measurement
4 S-parameter measurements Filter bandwidth measurement
Agenda
• DTV Receivers - Laboratory Tests
• Signal & interference - Field Tests
• Summary
Page
66
Agilent digital video and broadcast audio solution portfolio
PXA N9030A
MXA N9020A
CXA N9000A
E4438C ESG
Signal GenerationSoftware
Signal GeneratorFading and MIMO Simulation
Signal Analyzer/Receiver
Signal Analysis Software
N5106A PXB
X-Series
N5182B/72B MXG/EXG
N5182A MXG
E8267D PSG
EXA N9010A
N7623B Signal Studio
For Digital Video
N7611B Signal Studio
For Broadcast Audio
N/W9063A Phase Noise
Meas Application
X-Series Digital Video
Meas Application
89601B SW
Network Deployment
Test
N991x/2x
RF Analyzer
N934x
Handheld SAN6171A
MATLAB softwareM9381A PXI VSG
RF and microwave combination analyzers
Microwave vector network analyzers (VNA)
Microwave spectrum analyzers
Base: Cable and antenna analyzer
Key options: - Spectrum analyzer
- Vector network analyzer
- Vector voltmeter
- Built-in power meter
All FieldFox options are available and upgradeable.
Base: Transmission/reflection VNA
Key options:- Full 2-port S-parameters
- Two-port QuickCal
- Time domain
- Cable and antenna analyzer
- Vector voltmeter
- Built-in power meter
Base: Spectrum analyzer
Key options:- Full-band tracking generator
- Full-band preamplifier
- Interference analyzer & spectrogram
- Reflection measurements
- Built-in power meter
14 new FieldFox handheld analyzers 4, 6.5, 9, 14, 18 and 26.5 GHz
Muito Obrigado!