1. Traceable OTA Performance Testing Presentation
Doc.: IEEE /0132r0
January 2006
January 2006
Traceable OTA Performance Testing Presentation
Date:
Authors:
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Dr. Michael D. Foegelle, ETS-Lindgren
Dr. Michael D. Foegelle, ETS-Lindgren

2. Doc.: IEEE /0132r0
January 2006
January 2006
Abstract
This presentation summarizes the draft submission /0131r0 on Traceable OTA Performance Testing.
The draft submission introduces the test environment and metrics necessary for traceable over-the-air performance testing of the wireless radios in devices.
bet
Dr. Michael D. Foegelle, ETS-Lindgren
Dr. Michael D. Foegelle, ETS-Lindgren

3. Overview Introduction to Proposal Traceable OTA Test Environment
January 2006
Overview
Introduction to Proposal
Traceable OTA Test Environment
Traceable OTA Test Method
Motion
References
Dr. Michael D. Foegelle, ETS-Lindgren

4. Introduction to Proposal
January 2006
Introduction to Proposal
The contents of this submission have been presented and reviewed over the past year and a half and include information from contributions:
IEEE /0674r1, “Passive Antenna Measurements vs. Over-The-Air Active Measurements and Associated Metrics for Wi-Fi Testing”
IEEE /0943r0, “Conducted Power and Sensitivity Measurements”
IEEE /0944r0, “OTA TRP and TIS Testing”
Dr. Michael D. Foegelle, ETS-Lindgren

5. Traceable OTA Test Environment Introduction and Purpose
January 2006
Traceable OTA Test Environment Introduction and Purpose
Describes the test system required for performing traceable over-the-air RF performance tests on DUTs.
Specifies system components and associated measurement quality.
Addresses combined radio and antenna related performance of single DUTs
in free-space
in free-space with near-field loading
with other impairments
Introduces bulk performance metrics total radiated power (TRP) and total isotropic sensitivity (TIS) and related metrics.
Traceable nature of measurements allows comparison of DUTs tested in different systems to within a known level of measurement uncertainty.
Dr. Michael D. Foegelle, ETS-Lindgren

6. Traceable OTA Test Environment Configuration
January 2006
Traceable OTA Test Environment Configuration
Defines test system consisting of:
Fully anechoic chamber for isolation and free-space environment
Multi-axis positioning system for spherical pattern measurement.
Dual polarized measurement antenna.
Traceable RF test equipment for measuring power and sensitivity of DUT (based on conducted test methods).
Near field phantoms for different physical use cases.
Dr. Michael D. Foegelle, ETS-Lindgren

7. Traceable OTA Test Environment Configuration
January 2006
Traceable OTA Test Environment Configuration
Defines environmental parameters/characteristics including:
Spherical coordinate system and polarization definitions.
Specifies far field conditions and range length issues.
Defines the quiet zone and references various site validation methodologies.
Provides methodology for range calibration.
Note: This section is part of training documentation I’ve written in the past. Portions of this section were submitted to the CTIA and published verbatim as part of their OTA test plan, but rights to distribute original content were maintained. Can pursue official release from CTIA if needed.
Various other uncertainty contributions and points of concern.
Dr. Michael D. Foegelle, ETS-Lindgren

8. Traceable OTA Test Environment Approach
January 2006
Traceable OTA Test Environment Approach
Defines basic physical configuration for free-space measurements of DUT.
Orientation with respect to positioner/coordinate system.
Orientation of moveable antenna elements.
Routing of cables, etc.
References conducted tests for other DUT parameters.
Defines variants of test configuration including:
Use of near field phantoms (head, hands, tabletops, walls)
Alternate antenna orientations.
Alternate cable orientations.
Impairment with other radios active (converged devices)
Defines variants of test conditions including angular step size and sensitivity search algorithm.
Dr. Michael D. Foegelle, ETS-Lindgren

9. Traceable OTA Test Method Specification of Metrics
January 2006
Traceable OTA Test Method Specification of Metrics
Defines single point metrics:
Effective Isotropic Radiated Power (EIRP)
Effective Isotropic Sensitivity (EIS)
Defines integrated (total) surface metrics:
Total Radiated Power (TRP)
Total Isotropic Sensitivity (TIS)
Defines ratio metrics:
Directivity
Front to back ratio
Gain
Efficiency
Dr. Michael D. Foegelle, ETS-Lindgren

10. Traceable OTA Test Method Procedure & Results
January 2006
Traceable OTA Test Method Procedure & Results
Defines step by step procedure for measuring pattern data using conical cut method (north to south pole).
Specifies recommended output information.
Dr. Michael D. Foegelle, ETS-Lindgren

11. January 2006
Motion
Move to adopt the contents of document 11-06/1031r0 into the P draft.
Moved:
Second:
Yes/No/Abstain:
Motion is technical (75% to pass)
Dr. Michael D. Foegelle, ETS-Lindgren

12. January 2006
References
1.       IEEE /0131r0, “Traceable OTA Performance Testing Proposal,” M.D. Foegelle.
Dr. Michael D. Foegelle, ETS-Lindgren