Upload
urvi
View
28
Download
0
Embed Size (px)
DESCRIPTION
Cognitive Radio System Testbed Demonstration. Dr. Kyutae Lim ([email protected]) Associate Director of Technology Georgia Electronic Design Center, www.gedcenter.org Georgia Institute of Technology. Cognitive Radio Testbed Overview. Cognitive Radio Testbed. - PowerPoint PPT Presentation
Citation preview
May 2006
Slide 1
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Cognitive Radio System Testbed Demonstration
Dr. Kyutae Lim ([email protected])Associate Director of Technology
Georgia Electronic Design Center, www.gedcenter.org
Georgia Institute of Technology
May 2006
Slide 2
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Cognitive Radio Testbed Overview
May 2006
Slide 3
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Cognitive Radio Testbed
• Cognitive Radio Testbed was built in Georgia Electronic Design Center, Georgia Tech, Atlanta, GA.
• Perform the real time demonstration of various operations in CR system.
• Perform the industrial level of evaluation for PHY/MAG and Sensing Technologies.
• CR Testbed has flexibility in H/W and S/W.
• Testbed configuration and test procedure can be set by WG and Tiger team.
• We hope CR testbed to contribute for forging IEEE 802.22 Standard.
May 2006
Slide 4
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
DTV Sig Gen
Vector Sig Gen
AMP
TV Antenna
ADC : Data Acquisition
Spectrum Analyzer
Equipment Control
Signal Generation
Spectrum Sensing
Component Control
DisplayControl
Received sig.Analysis
Testbed Control : MATLAB
4 CH DACReceiverModule
Vector Signal Analyzer
DTV Test Receiver
Signal Generation Signal Reception
CR Testbed System Configuration
May 2006
Slide 5
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Photo of Cognitive Radio Testbed
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
DTV monitorDTV
monitorMain
ControlMain
ControlRec. signalspectrum
Rec. signalspectrum
Constellation(OFDMA)
Constellation(OFDMA)
RF receiver module
RF receiver module
Vector signal analyzer
Vector signal analyzer
Spectrum Analyzer
Spectrum Analyzer
Vector signal generator
Vector signal generator
Broadcast sig. generator
Broadcast sig. generator
DAC/ADC/ComputerDAC/ADC/Computer
May 2006
Slide 6
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
System SpecificationName Specification
SMU 200A• Vector Signal Generator • Dual RF path – A (100 kHz ~ 6 GHz), B (100 kHz ~ 3 GHz)• I/Q baseband modulation bandwidth – 56 MHz
FSQ 40• Vector Signal Analyzer• RF input – 20 Hz ~ 40 GHz• Standard – GSM/EDGE, FM, CDMA2K, Bluetooth, WLAN, WiMax
SFU
• TV Signal Generator• RF output – 100 kHz ~ 3 GHz• Standard
– Digital TV – ATSC, DVB-T/H/C/S, DMB-T, DIRECTV, T-DMB/DAB– Analog TV, Arbitrary signal
• Test stream generator• Noise – AWGN, phase noise, impulsive noise• Fading – static path, pure dopler, rayleigh, rice, const. phase
Tuner• RF input – 50 ~ 878 MHz• IF out at 44 MHz / 6-MHz SAW filter can be bypassed• NF: 8 dB / RF VGA gain control: -12 ~ 38 dB
DAQ (ADC)
• PCI-interface• Dual channel / 12-bit resolution• Max. 400 MSample/sec• Input Dynamic Range : 100 mV ~ 5 V
DAC• PCI-interface• 4 channel / 12-bit resolution• Max. 300 MSample/sec
EFA• TV Test Receiver• ATSC/8VSB Demodulation
May 2006
Slide 7
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Demo.1 : Cognitive Radio System Concept
Purpose : Basic CR operation principle
Spectrum Sensing
Co-existance of Incumbent and WRAN
Interference mitigation
Frequency agile operation
May 2006
Slide 8
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
DTV Sig Gen
Vector Sig Gen
AMP
TV Antenna
ADC : Data Acquisition
Spectrum Analyzer
Equipment Control
Signal Generation
Spectrum Sensing
Component Control
DisplayControl
Received sig.Analysis
Testbed Control : MATLAB
4 CH DACReceiverModule
Vector Signal Analyzer
DTV Test Receiver
Signal Generation Signal Reception
Testbed Configuration: Demo.1
May 2006
Slide 9
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Spectrum Sensing (TV signals only)
May 2006
Slide 10
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
WRAN Interferer (overlapped)
WiMax signal used as WRAN
May 2006
Slide 11
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
OFDMA Constellation / EVM
OFDMA communication failed.No constellation.EVM does not meet the criteria
May 2006
Slide 12
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
TVs-WRAN Co-Existence (WRAN in vacant channel)
May 2006
Slide 13
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
OFDMA Constellation / EVM
OFDMA communication working well.Good constellation.EVM meet the criteria
May 2006
Slide 14
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Dynamic Frequency Switching - I- New primary user signal into the WRAN channel -
May 2006
Slide 15
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
OFDMA Constellation / EVM
Communication failed.
May 2006
Slide 16
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Dynamic Frequency Switching - II- WRAN signal move to another vacant channel -
May 2006
Slide 17
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
OFDMA Constellation / EVM
Communication in work.
May 2006
Slide 18
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Demo.2 : Evaluation of Spectrum Sensing Technology
Purpose : Verifying Various Spectrum Sensing Technologies
Generating Spectrum Environment
Energy Detection: MRSS
Feature Detection: AAC
May 2006
Slide 19
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
DTV Sig Gen
Vector Sig Gen
AMP
TV Antenna
ADC : Data Acquisition
Spectrum Analyzer
Equipment Control
Signal Generation
Spectrum Sensing
Component Control
DisplayControl
Received sig.Analysis
Testbed Control : MATLAB
4 CH DACReceiverModule
Vector Signal Analyzer
DTV Test Receiver
Signal Generation Signal Reception
Testbed Configuration: Demo.2
May 2006
Slide 20
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Dual Sensing Strategy (presented Mar 06)
Energy Detectionfor wide band
(Analog, RSSI, MRSS, FFT…)
Begin Sensing
Fine/Feature Detection for single channel
End Sensing
occupied?Y
N
MAC(Select
single channel)
FFT CSFDField Sync
OptimumRadiometer
Multi-cycleDetector
AACSpectral
Correlation
Spectrum Usage
Database(BS) ATSC
Segment Sync
May 2006
Slide 21
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Input Signal Spectrum / Time-domain Waveform
May 2006
Slide 22
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Coarse MRSS
May 2006
Slide 23
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Fine MRSS with Threshold Detection
May 2006
Slide 24
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
AAC for OFDM (WLAN 802.11a)
Get two clues (due to short and long preamble) !!
May 2006
Slide 25
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
An Example of Scheduling Algorithm for DFH
• A WRAN system maintains two channels (operating channel and candidate channel)
• If WRAN BSes can communicate each other to schedule the time switching to the candidate channel, collision can be completely avoided.
– Even if collision occurs on the candidate channel, it is only in very short time (about quite time).
WRAN A
Channel 1
Channel 2
Channel 3
WRAN B
May 2006
Slide 26
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Demo.3 : Evaluation of protecting Incumbent user from WRAN signal
Generation of various fading environment
DTV Signal quality measurement in Fading
Coexistence of DTV and WRAN
Signal quality measure for DTV and WRAN
May 2006
Slide 27
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
DTV Sig Gen
Vector Sig Gen
AMP
TV Antenna
ADC : Data Acquisition
Spectrum Analyzer
Equipment Control
Signal Generation
Spectrum Sensing
Component Control
DisplayControl
Received sig.Analysis
Testbed Control : MATLAB
4 CH DACReceiverModule
Vector Signal Analyzer
DTV Test Receiver
Signal Generation Signal Reception
Testbed Configuration: Demo.3
May 2006
Slide 28
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
ATSC Test 1 – Fading (1)
• ATSC with Fading channel environment
• ATSC– Ch. 39 (center freq: 623 MHz)– Level: -10 dBm– Fading
• Rayleigh (Pass loss: 3 dB, freq ratio = 1.00)• EASY3 for DTV test
• Number of DTV signals and Fading parameters can be easily adjusted
May 2006
Slide 29
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
ATSC Test 1 – Fading (2)
May 2006
Slide 30
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Signal quality can be measured
ATSC Test 1 – Fading (3)
May 2006
Slide 31
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
ATSC Test 1 – Fading (4)``````````````````````````````````````````````````````````````````````````````````````````````````````````````` ` `Various graphs enables signal quality analysis for DTV signal
May 2006
Slide 32
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
ATSC Test 2 – w/ WiMax (1)
• ATSC with Fading plus OFDMA signal to the adjacent channel
• ATSC– Ch. 39 (center freq: 623 MHz)– Level: -10 dBm– No fading
• WRAN (WiMax signal is used)– Freq: 616.5 MHz, BW: 7 MHz– Level: 0 dBm
May 2006
Slide 33
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
ATSC Test 2 – w/ WRAN (2)• Spectrum
WiMax
ATSC
WiMax Mask
May 2006
Slide 34
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
ATSC Test 2 – w/ WRAN (3)
May 2006
Slide 35
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Signal quality is little bit degraded due to OFDM signal at adjacent channel
ATSC Test 2 – w/ WRAN (4)
May 2006
Slide 36
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
ATSC Test 2 – w/ WRAN (5)
OFDM signal
May 2006
Slide 37
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
ATSC Test 2 – w/ WRAN (6)
• OFDM (WiMax) performance Still OK!
May 2006
Slide 38
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Summary
• CR Testbed has built in GEDC, Georgia Tech– Maximum H/W flexibility– Full S/W control: MATLAB– Easy to expand for evaluating Sensing, Interference, MAC, PHY …
• CR Testbed has been demonstrated– CR Concept and frequency agile operation– Spectrum sensing technology evaluation– Emulation of various fading channel environment– Evaluation of WRAN signal to interfere DTV reception
May 2006
Slide 39
doc.: IEEE 802.22-06/0076r0
Submission Kyutae Lim, Georgia Tech
Suggestion
• Realistic spectrum environment can generated repeatedly.• The testbed can be customized to perform various
test/evaluation.• The parameters and figure-of-merit can be defined by WG.• Standard procedure for evaluation can be defined by WG.
• Let’s use this testbed for standard evaluation platform for PHY and Sensing technology !!!