doc.: ieee 802.15-02/383 sg3a submission marcus pendergrass time domain corporation (tdc) september...
TRANSCRIPT
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: Comparison of S-V Channel Model to Empirical DataDate Submitted: 08 September, 2002Source: Marcus Pendergrass, Time Domain Corporation 7057 Old Madison Pike, Huntsville, AL 35806Voice:256-428-6344 FAX: [256-922-0387], E-Mail: [email protected]
Re: Ultra-wideband Channel Models IEEE P802.15-02/208r0-SG3a, 17 April, 2002,
Abstract: Channel realizations generated by the S-V model are compared to measured channels. We show that the S-V model is able to accurately reproduce population means for 3 channel parameters: RMS delay spread, mean excess delay, and number of significant paths. In addition, a hueristic channel classification scheme is proposed, and we show that the S-V model is able to produce exemplars of each channel class except for one. We recommend that SG3a adopt a channel model consisting of a defined set of channel realizations generated by the S-V model, augmented with additional channel realizations necessary to capture the wide variety of channels that occur in typical WPAN application scenarios.Purpose: The information provided in this document is for consideration in the selection of a UWB channel model to be used for evaluating the performance of a high rate UWB PHY for WPANs.Notice: This document has been prepared to assist the IEEE P802.15. 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 acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.
Slide 1
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
• S-V Model can match measured channels in terms of the population means of Mean Excess Delay, RMS Delay Spread, and Number of Significant Paths for three scenarios:• NLOS, 0 to 4 meters, office• LOS, 0 to 4 meters, office• NLOS, 4 to 6 meters, office
• Variation of measured channels is very wide, even within a single scenario.• A heuristic channel taxonomy is proposed.
• Single set of S-V parameters for each scenario is probably not sufficient to capture the wide variation among channels from a given category.
• Recommendations• channel model should consist of a defined set of channel impulse
response realizations• make sure all channel types within a given scenario are represented
• multiple S-V parameter sets per scenario
Summary
Slide 2
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
Case 1:Case 2:Case 3:
NLOS, 0-4 meters, officeLOS, 0-4 meters, officeNLOS, 4-10 meters, office
Measurements
1 2 3Case:
Population means
Mean excess delay
RMS delay spread
Number of Paths (85 % energy capture)
10.38
8.03
36.1
5.05
5.28
24.0
14.18
14.28
61.54
S-V Model
1 2 3Case:
Population means*
10.04
8.33
35.88
5.28
5.50
24.39
15.16
15.07
61.77
Channel Parameter
*data provided by Jeff Foerster
S-V Model Can Match Population Means of Data
Slide 3
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
Freespace
Freespace + diffuse multipath
Closely spaced dominant paths
Closely spaced dominant paths + strong late arriving cluster
Strong late arriving cluster + diffuse multipath
Strong late arriving cluster, little diffuse multipath
Diffuse multipath, no single dominant path
? ?
?
Measurements S-V model
1 2 3 1 2 3Case:Case:
Channel Type
LOS path not dominant, little diffuse multipath
LOS path not dominant + diffuse multipath
? ? ? ?
Case 1:Case 2:Case 3:
NLOS, 0-4 meters, officeLOS, 0-4 meters, officeNLOS, 4-10 meters, office
Heuristic Channel Taxonomy
Slide 4
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
A Channel Menagerie
• The next several slides give visual depictions of selected channels from each Channel Type described on the previous slide.
• Where possible, we show both measured and simulated channels for each Channel Type.
• Purpose:
• illustrate the variety of channels in the measurement data
• indicate the ability of the S-V model to provide a reasonable facsimile to these channels
• Measured channels have RED titles
• Simulated channels have GREEN titles
Slide 5
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
Freespace
DSO ScanDSO Scan
CIRCIR
Reconstructed Scan
Reconstructed Scan
Measured dataMeasured data spectrumspectrum
Slide 6
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
Freespace + diffuse multipath
DSO ScanDSO Scan
CIRCIR
Reconstructed Scan
Reconstructed Scan
Measured dataMeasured data spectrumspectrum
Slide 7
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
Freespace + diffuse multipath
S-V CIRS-V CIR
95% energy capture
95% energy capture
85% energy capture
85% energy capture
S-V reconstructed waveformS-V reconstructed waveform
Slide 8
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
Closely spaced dominant paths
DSO ScanDSO Scan
CIRCIR
Reconstructed Scan
Reconstructed Scan
Measured dataMeasured data spectrumspectrum
Slide 9
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
Closely spaced dominant paths
S-V CIRS-V CIR
95% energy capture
95% energy capture
85% energy capture
85% energy capture
S-V reconstructed waveformS-V reconstructed waveform
Slide 10
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
Closely spaced dominant paths, strong late-arriving cluster
DSO ScanDSO Scan
CIRCIR
Reconstructed Scan
Reconstructed Scan
Measured dataMeasured data spectrumspectrum
Slide 11
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
Closely spaced dominant paths, strong late-arriving cluster
S-V CIRS-V CIR
95% energy capture
95% energy capture
85% energy capture
85% energy capture
S-V reconstructed waveformS-V reconstructed waveform
Slide 12
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
LOS path not dominant, little diffuse multipath
DSO ScanDSO Scan
CIRCIR
Reconstructed Scan
Reconstructed Scan
Measured dataMeasured data spectrumspectrum
Slide 13
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
LOS path not dominant, little diffuse multipath
S-V CIRS-V CIR
95% energy capture
95% energy capture
85% energy capture
85% energy capture
S-V reconstructed waveformS-V reconstructed waveform
Slide 14
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
LOS path not dominant + diffuse multipath
DSO ScanDSO Scan
CIRCIR
Reconstructed Scan
Reconstructed Scan
Measured dataMeasured data spectrumspectrum
Slide 15
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
LOS path not dominant + diffuse multipath
S-V CIRS-V CIR
95% energy capture
95% energy capture
85% energy capture
85% energy capture
S-V reconstructed waveformS-V reconstructed waveform
Slide 16
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
Strong late-arriving cluster, little diffuse multipath
DSO ScanDSO Scan
CIRCIR
Reconstructed Scan
Reconstructed Scan
Measured dataMeasured data spectrumspectrum
Slide 17
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
Strong late-arriving cluster, little diffuse multipath
S-V CIRS-V CIR
95% energy capture
95% energy capture
85% energy capture
85% energy capture
S-V reconstructed waveformS-V reconstructed waveform
Slide 18
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
Strong late-arriving cluster + diffuse multipath
DSO ScanDSO Scan
CIRCIR
Reconstructed Scan
Reconstructed Scan
Measured dataMeasured data spectrumspectrum
Slide 19
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
Strong late-arriving cluster + diffuse multipath
S-V CIRS-V CIR
95% energy capture
95% energy capture
85% energy capture
85% energy capture
S-V reconstructed waveformS-V reconstructed waveform
Slide 20
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
Diffuse multipath, no single dominant path
DSO ScanDSO Scan
CIRCIR
Reconstructed Scan
Reconstructed Scan
Measured dataMeasured data spectrumspectrum
Slide 21
Marcus PendergrassTime Domain Corporation (TDC)
doc.: IEEE 802.15-02/383 SG3a September 2002
Submission
• Channel model should consist of a defined set of at least 50 channel impulse response realizations for each of the following 6 scenarios.
• Channel realizations should include all types of channels found in the measured data for each scenario (see channel taxonomy, slide 3).
• Current parameter sets cover all channel categories except one (very diffuse multipath), for the “office” scenarios.
• Generate additional channel realizations to cover remaining scenarios and channel categories:
• Preferred method: find S-V parameters to fill in the holes in the current set of realizations.
• Alternate method: supplement S-V channel realizations with realizations taken from measured data.
Recommendations
• NLOS, 0 to 4 meters, office• LOS, 0 to 4 meters, office• NLOS, 4 to 10 meters, office
• NLOS, 0 to 4 meters, residential• LOS, 0 to 4 meters, residential• NLOS, 4 to 10 meters, residential
Slide 22