1. San Francisco: Proposed Adjacent Channel Interference Test Methodology
May 2005
doc.: IEEE /0451r0
July 2005
San Francisco: Proposed Adjacent Channel Interference Test Methodology
Date:
Authors:
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Kobayashi, Trachewsky, Victor, Broadcom Corp
Kobayashi, Trachewsky, Victor, Broadcom Corp

2. ACI Overview System Level Description ACI Test ACI specification
May 2005
doc.: IEEE /0451r0
July 2005
ACI Overview
System Level Description
ACI specification
ACI Test Block diagram
Calibration
ACI Test
ACI test procedure
ACI test results
Kobayashi, Trachewsky, Victor, Broadcom Corp
Kobayashi, Trachewsky, Victor, Broadcom Corp

3. Adjacent Channel Rejection (OFDM)
July 2005
Adjacent Channel Rejection (OFDM)
In-band signal power level at 3 dB above sensitivity of corresponding data rate
Raise interfering signal power level until 10% PER
Difference between interfering signal power and in-band signal power must exceed adjacent channel rejection.
Std a-1999 Section
Kobayashi, Trachewsky, Victor, Broadcom Corp

4. Adjacent Channel Rejection (OFDM)
July 2005
Adjacent Channel Rejection (OFDM) a b
= b + 3 c
= b 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
-79 16
-63 9
-81
-78 15 12
-76 13 18
-77
-74 11 24
-71 8 36
-70
-67 4 48
-66 54
-65
-62 -1
Kobayashi, Trachewsky, Victor, Broadcom Corp

5. Adjacent Channel Rejection (CCK)
July 2005
Adjacent Channel Rejection (CCK)
In-band signal power level at -70 dBm for 11 Mbps
Raise interfering signal power level until 8% FER
Difference between interfering signal power and in-band signal power must exceed 35 dB
Std b-1999 Section
Kobayashi, Trachewsky, Victor, Broadcom Corp

6. July 2005
ACI Block Diagram
Mux
AP outband
Controller
Power meter
AP inband
STA2 outband +
STA1 dut inband
Atten1 inband
Atten2 outband
legend:
ethernet
gpib,dio
signal path
Kobayashi, Trachewsky, Victor, Broadcom Corp

7. July 2005
Calibration
Mux
AP outband
Controller
Power meter
AP inband
STA2 outband +
STA1 dut inband
Atten1 inband
Atten2 outband 3 1 2 4
Use a Network Analyzer to take path loss measurements for the DUT path (1), the ACI path (2), DUT to powermeter (3), and ACI path to powermeter (4)
Measurements made on center frequencies of channel of interest
Kobayashi, Trachewsky, Victor, Broadcom Corp

8. Basic ACI Test For each desired ACI test point July 2005
Measure power for inband AP and outband AP 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 AP 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)
Kobayashi, Trachewsky, Victor, Broadcom Corp

9. July 2005
ACI test results
Frame Error rate versus ACI interferer power for a 54 Mpbs transmission
Kobayashi, Trachewsky, Victor, Broadcom Corp