1. doc.: IEEE 802.11-05/0758r1 Submission Sep 2005 Kobayashi, Trachewsky, Victor, Broadcom CorpSlide 1 Garden Grove 05: Proposed Adjacent Channel Interference Test Methodology Notice: This document has been prepared to assist IEEE 802.11. 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 802.11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures, 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 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 802.11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at.http:// ieee802.org/guides/bylaws/sb-bylaws.pdfstuart.kerry@philips.compatcom@ieee.org Date: 2005-09-19 Authors:

2. doc.: IEEE 802.11-05/0758r1 Submission Sep 2005 Kobayashi, Trachewsky, Victor, Broadcom CorpSlide 2 ACI Overview System Level Description Usage Model ACI Performance Scenarios Independent Jammer Independent WLAN Jammer Interacting WLAN Jammer ACI background material ACI Test Block diagram Calibration

3. doc.: IEEE 802.11-05/0758r1 Submission Sep 2005 Kobayashi, Trachewsky, Victor, Broadcom CorpSlide 3 Overview cont. ACI Test ACI test procedure ACI test results

4. doc.: IEEE 802.11-05/0758r1 Submission Sep 2005 Kobayashi, Trachewsky, Victor, Broadcom CorpSlide 4 Usage Model ACI performance tests are a secondary metric Affects many primary metrics –Throughput –Frame Error rate –Rate versus range, etc… Can be applied to all usage models –Data Oriented –Streaming –Latency sensitive

5. doc.: IEEE 802.11-05/0758r1 Submission Sep 2005 Kobayashi, Trachewsky, Victor, Broadcom CorpSlide 5 Scenarios ACI Performance Scenarios A.Independent Jammer (AWG, non-MAC controlled source) 1)Emphasis on RX filtering B.Independent WLAN Jammer (test and jammer networks are isolated from each other) 1)Controlled “real” network source C.Interacting WLAN Jammer (test and jammer networks allowed to interact with each other) 1)Close to real Matrix of devices for scenarios B & C –Let Test Network and 802.11 Interferer Network interact as they would in the real world to test different vendors’ interoperability.

6. doc.: IEEE 802.11-05/0758r1 Submission Sep 2005 Kobayashi, Trachewsky, Victor, Broadcom CorpSlide 6 Background: Adjacent Channel Rejection (OFDM) In-band signal power level at 3 dB above sensitivity of corresponding data rate 2 Tests: –Raise interfering signal power level until 10% PER –Set interferer at IEEE limit and test sensitivity of device Std 802.11a-1999 Section 17.3.10.2

7. doc.: IEEE 802.11-05/0758r1 Submission Sep 2005 Kobayashi, Trachewsky, Victor, Broadcom CorpSlide 7 Background: Adjacent Channel Rejection (OFDM) ab= b + 3c= b + 3 + c Data Rate (Mbps) Min. sensitivity (dBm) signal level at DUT (in-band) (dBm) Adjacent channel rejection (dB) Signal level at DUT (adjacent channel) (dBm) 6-82-7916-63 9-81-7815-63 12-79-7613-63 18-77-7411-63 24-74-718-63 36-70-674-63 48-66-630 54-65-62-63

8. doc.: IEEE 802.11-05/0758r1 Submission Sep 2005 Kobayashi, Trachewsky, Victor, Broadcom CorpSlide 8 Background: Adjacent Channel Rejection (CCK) In-band signal power level at -70 dBm for 11 Mbps 2 Tests: –Raise interfering signal power level until 8% FER –Set interferer at IEEE limit and test sensitivity of device Difference between interfering signal power and in- band signal power must exceed 35 dB Std 802.11b-1999 Section 18.4.8.3

9. doc.: IEEE 802.11-05/0758r1 Submission Sep 2005 Kobayashi, Trachewsky, Victor, Broadcom CorpSlide 9 ACI Test Block Diagram Test Controller 1Control of Attenuators 2Control of Traffic Generator and Analyzer 3Control of Power Meter DUT (client) Attenuato r Traffic Generator Traffic Analyzer WLCP (Inband) Power Meter Attenuato r WLCP (jammer) WLCP (client jammer) AWG Attenuato r Legend: ______ RF cables ______ Wired LAN cables ______ Control Cables Terminator Directional coupler Circulator mux ACI block diagram Conducted version Based roughly on conducted environment as specified in the draft but with modifications specific to ACI performance measurements Attenuato r

10. doc.: IEEE 802.11-05/0758r1 Submission Sep 2005 Kobayashi, Trachewsky, Victor, Broadcom CorpSlide 10 Calibration Calibration Procedure Measure path loss from every point to point A enumerated as B to A, C to A, D to A and E to A Measure path loss from every point to powermeter (PM) enumerated as B to PM, C to PM, D to PM and E to PM Measure path loss from C to B with attenuator set to 0 Basic idea is to measure power at point A given input from any source. Test Controller 1Control of Attenuators 2Control of Traffic Generator and Analyzer 3Control of Power Meter DUT (client) Attenuato r Traffic Generator Traffic Analyzer WLCP (Inband) Power Meter Attenuato r WLCP (jammer) WLCP (client jammer) AWG Attenuato r Legend: ______ RF cables ______ Wired LAN cables ______ Control Cables Terminator Directional coupler Circulator mux A PM B C D E Attenuato r

11. doc.: IEEE 802.11-05/0758r1 Submission Sep 2005 Kobayashi, Trachewsky, Victor, Broadcom CorpSlide 11 Basic ACI Test Use Conducted Test Environment Select and note the ACI source being tested (see diagram and inputs to mux): –AWG –WLCP (client jammer) isolated –WLCP (client jammer) non-isolated –WLCP (jammer) non-isolated For each desired ACI test point –Measure power for inband AP and outband interferer using a powermeter –Adjust attenuators to achieve desired inband AP power to DUT, if possible otherwise abort test run –Adjust attenuators to achieve desired outband interferer power to DUT, if possible otherwise abort current test point –measure the frame error rate (FER) –repeat above for each desired ACI test point following guidelines of requirements (Take measurements at a minimum of +/- 5dB around the ACI specification and/or until the FER specified is achieved.) –Note each additional point beyond the minimum ACI requirements meeting the Frame Error Conditions is considered the Adjacent Channel Rejection Margin (ACRM)

12. doc.: IEEE 802.11-05/0758r1 Submission Sep 2005 Kobayashi, Trachewsky, Victor, Broadcom CorpSlide 12 Frame Error rate versus ACI interferer power for a 54 Mpbs transmission ACI test results

13. doc.: IEEE 802.11-05/0758r1 Submission Sep 2005 Kobayashi, Trachewsky, Victor, Broadcom CorpSlide 13 ACI Test Modifiers Test DUTs using auto rate negotiation Test DUT’s ACI performance at various fixed rates Test ACI performance in other environments (OTA, COAT, Indoor LOS, etc)