March 2 006 Victo r Taw il, M Slide 1 doc.: IEEE 802.22-06/0038r0 Submission DTV Signal Captures IEEE P802.22 Wireless RANs Date: 2006-03-08 N am e C om pany A ddress Phone em ail V ictorTaw il M STV 4100 W isconsin Ave, N W . W ashington, DC 20016 202-966-1956 V tawil@ M STV.org Authors: Notice: This document has been prepared to assist IEEE 802.22. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.22. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures http://standards.ieee.org/guides/bylaws/sb-bylaws.pdf including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair Carl R. Stevenson as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.22 Working Group. If you have
Doc.: IEEE 802.22-06/0038r0 Submission March 2006 Victor Tawil, MSTVSlide 1 DTV Signal Captures IEEE P802.22 Wireless RANs Date: 2006-03-08 Authors: Notice:
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March 2006
Victor Tawil, MSTV
Slide 1
doc.: IEEE 802.22-06/0038r0
Submission
DTV Signal CapturesIEEE P802.22 Wireless RANs Date: 2006-03-08
Name Company Address Phone email Victor Tawil MSTV 4100 Wisconsin
Ave, NW. Washington, DC 20016
202-966-1956 Vtawil@ MSTV.org
Authors:
Notice: This document has been prepared to assist IEEE 802.22. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.22.
Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures http://standards.ieee.org/guides/bylaws/sb-bylaws.pdf including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair Carl R. Stevenson as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.22 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at [email protected].>
March 2006
Victor Tawil, MSTV
Slide 2
doc.: IEEE 802.22-06/0038r0
Submission
Presentation Outline
• Field Test Measurement Program
• DTV Signal Captures
• Use of DTV Signal Captures to Evaluate the Performance of the various Sensing Algorithms
March 2006
Victor Tawil, MSTV
Slide 3
doc.: IEEE 802.22-06/0038r0
Submission
Broadcasters’ Field Measurements(1996-2001)
• Goal– Determine the coverage of the ATSC system relative to the existing
analog– Evaluate the performance of the ATSC system under different
reception conditions (i.e., multipath & noise conditions, etc.)– Compare the performance of different generation of receivers– Aid in the development a new propagation model or modify an
existing one to more accurately predict the performance of the new digital service
March 2006
Victor Tawil, MSTV
Slide 4
doc.: IEEE 802.22-06/0038r0
Submission
Field Measurement ProgramScope
•Measurements were made at low VHF, High VHF and UHF
•Collected more than 20,000 outdoor locations in 25 different markets in the US
•More than 5,000 indoor locations in 10 different markets
March 2006
Victor Tawil, MSTV
Slide 5
doc.: IEEE 802.22-06/0038r0
Submission
Findings
• Coverage of the ATSC DTV system is equivalent to the existing analog service under benign, static or slow varying multipath conditions
• A large number of complex multipath conditions encountered in the field were not demodulated by older and current generation DTV receivers. These conditions were difficult to simulate in the lab
March 2006
Victor Tawil, MSTV
Slide 6
doc.: IEEE 802.22-06/0038r0
Submission
PS-RG14-39-6-SB
6 MHz6 MHzDTVDTV
6 MHz6 MHzDTVDTV
6 MHz6 MHzDTVDTV
March 2006
Victor Tawil, MSTV
Slide 7
doc.: IEEE 802.22-06/0038r0
Submission
6 MHz6 MHzDTVDTV
6 MHz6 MHzDTVDTV
6 MHz6 MHzNTSCNTSC
March 2006
Victor Tawil, MSTV
Slide 8
doc.: IEEE 802.22-06/0038r0
Submission
PS-RG15-36-6-SB
6 MHz6 MHzDTVDTV
6 MHz6 MHzDTVDTV
6 MHz6 MHzNTSCNTSC
March 2006
Victor Tawil, MSTV
Slide 9
doc.: IEEE 802.22-06/0038r0
Submission
Ch. 6 Measurement - Charlotte, NC
75 85 95
10 d
B/d
iv
Frequency (MHz)
Impulse Noise
March 2006
Victor Tawil, MSTV
Slide 10
doc.: IEEE 802.22-06/0038r0
Submission
Findings(continued)
• Development of a predictive model to determine the service reliability of an ATSC DTV system is not possible at this stage. A better quantification of the multipath conditions in the field is needed
• Conducting field measurements to compare The performance of different generation of DTV receivers are expensive. Need a more economical alternative.
March 2006
Victor Tawil, MSTV
Slide 11
doc.: IEEE 802.22-06/0038r0
Submission
Outline
• Field Test Measurement Program
• DTV Signal Captures
• Use of DTV Signal Captures to Evaluate the Performance of various Sensing Algorithms
March 2006
Victor Tawil, MSTV
Slide 12
doc.: IEEE 802.22-06/0038r0
Submission
ATSC A/74 Recommended Practice: Receiver Performance Guidelines
The document lay out The document lay out performance thresholds performance thresholds and testing procedures and testing procedures for DTV receivers to for DTV receivers to ensure reliable ensure reliable reception of digital reception of digital television. Section 5.4 television. Section 5.4 focus on multipath focus on multipath testing of receivers:testing of receivers:
• Field capture Field capture EnsemblesEnsembles
•Laboratory EnsemblesLaboratory Ensembles
March 2006
Victor Tawil, MSTV
Slide 13
doc.: IEEE 802.22-06/0038r0
Submission
ATSC A/74 RF Field Ensembles
• A total of 50 RF field ensembles were selected from a group of 270 field ensembles collected in the Washington, DC urban areas and New York City. The selected ensembles represent difficult reception conditions (i.e. Challenging multipath conditions) – New York City
• 18 UHF field ensembles. All collected indoor
– Washington, DC• 32 UHF field ensembles. (22 indoor, 10 outdoor at 30 feet)
March 2006
Victor Tawil, MSTV
Slide 14
doc.: IEEE 802.22-06/0038r0
Submission
Description of Field Ensembles
March 2006
Victor Tawil, MSTV
Slide 15
doc.: IEEE 802.22-06/0038r0
Submission
A/74 Field EnsemblesData Format
• Each ensembles has a maximum length of up to 25 seconds
• DTV channels were sampled at 21.524476 Msample/sec and down converted to a low central IF frequency of 5.38 MHz
• A/D conversion of RF signal used a 12 bits A/D. Each sample was encoded into 2-byte word (signed Int l6 with a two’s complement format)
• A total of 1.05G bytes were needed for a 25 second capture. Data is available on DVD free of charge through MSTV
March 2006
Victor Tawil, MSTV
Slide 16
doc.: IEEE 802.22-06/0038r0
Submission
Physical Support of Data Transfer
• To play back data, an RF player is required (Sencore 910, or Celerity player available on loan from MSTV)
March 2006
Victor Tawil, MSTV
Slide 17
doc.: IEEE 802.22-06/0038r0
Submission
Video
March 2006
Victor Tawil, MSTV
Slide 18
doc.: IEEE 802.22-06/0038r0
Submission
Outline
• Field Test Measurement Program
• RF Signal Captures
• Use of DTV Signal Captures to Evaluate the Performance of the various Sensing Algorithms
March 2006
Victor Tawil, MSTV
Slide 19
doc.: IEEE 802.22-06/0038r0
Submission
Sensing: Evaluation of Various Detection Algorithms
• Two basic requirements– Evaluation of various detectors should use actual RF signal
conditions encountered in the field. Propose use of ATSC A/74 field ensembles
– Computer simulation of various detection algorithms using A/74 field ensembles (or a subset of) is acceptable, provided that an independent third party verification of the results is included as part of the evaluation process
March 2006
Victor Tawil, MSTV
Slide 20
doc.: IEEE 802.22-06/0038r0
Submission
Use of Field Ensembles to Evaluate the various Sensing proposal
• Tiger Team develop a methodology and test suite• Use the field ensembles or a subset of them as input to the sensing
simulator
• Attenuate the signal using a noise generator
• Determine the appropriate statistics
Noise GeneratorNoise Generator
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