1. [Performance Testing of Diversity for 802.11]
Month Year
doc.: IEEE yy/xxxxr0
March 2005
[Performance Testing of Diversity for ]
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Authors:
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Craig Warren Azimuth Systems
John Doe, Some Company

2. Abstract Approach to Basic diversity testing.
Month Year
doc.: IEEE yy/xxxxr0
March 2005
Abstract
Approach to Basic diversity testing.
Approach to Hysteresis Diversity testing.
Approach to Threshold Diversity testing
Metrics used for performance acceptance.
Craig Warren Azimuth Systems
John Doe, Some Company

3. Diversity configuration
March 2005
Diversity configuration
Craig Warren Azimuth Systems

4. Basic Diversity test March 2005
Basic diversity testing is used as a check to ensure that the Main and Aux antenna ports ( A and B) are well balanced and will not impact performance. Also this will be the Baseline throughput measurement going forward. In order to run all diversity tests a controlled environment is required. For each test there will be no bursting or fragmentation.
Atten A
Atten B
Dwell Time
Transition Time
Time
Power
Craig Warren Azimuth Systems

5. Basic Diversity test procedure.
March 2005
Basic Diversity test procedure.
The test is run by setting a high path loss on antenna port A while having a calibrated loss on antenna port B.
The loss on the port under test will be such that it will obtain the fastest rate of the modulation scheme it can achieve, and to ensure that the receive path is not over driven causing false performance degradation.
The traffic generator on the port under test and measure throughput “TPT”. The results expected should be the fastest data rate the modulation type can achieve. So for b it will be 11mbps – ~30% overhead = ~7.7mbps +/- x %. The same should follow for OFDM rates as well. “This may vary for implementation but becomes the baseline throughput”.
Once the TPT has been measured set a large path loss in the port under test and 20mS after, set the targeted port for test to the same calibrated path loss that the first port was measured. The TPT measurements should be equal to each other with x% of tolerances expected by the hardware stackup design.
To get the full test repeat the same methodology to the initial port that had been tested first.
Craig Warren Azimuth Systems

6. Hysteresis Diversity test
March 2005
Hysteresis Diversity test
This test is very similar to the Basic diversity test with the exception of the path loss transitions and dwell time.
Atten A
Atten B
Dwell Time
Transition Time
Crossover
Power Level
Time
Power
Craig Warren Azimuth Systems

7. Hysteresis Diversity procedure
March 2005
Hysteresis Diversity procedure
This test will start with a low path loss on antenna port A and high path loss on antenna port B.
Begin increasing path loss on port A in xdb steps while decreasing path loss on port B in like manner
The Idea here is to get the cross over of threshold settings to occur and see the impact on the throughput.
A dwell time is set for x seconds per step to ensure firmware makes good decisions on which antenna port to use and does not flip between ports.
Expectation is going to be that throughput will be effected by path loss however, there will be predictable dropouts and not any adverse oscillations in the throughput measurements. Throughput will be measured for the duration of the test cycle.
The test will be run until a full cycle meaning from port A to port B and back to A again.
Craig Warren Azimuth Systems

8. Threshold Diversity test
March 2005
Threshold Diversity test
This test is similar to Hysteresis diversity testing. The exception here is that the RSSI threshold of the algorithm shall be the set point and remain static on port A.
Then port B will be moved around that threshold +/- x db.
Transition Time
Dwell Time
Atten A
Power
Threshold
Power Level
Atten B
Time
Craig Warren Azimuth Systems

9. Threshold Diversity procedure
March 2005
Threshold Diversity procedure
Example is to set Port A to RSSI threshold value of -70dbm. Set the Port B path loss to 100.
Keep Port A at -70 and begin decreasing Port B in Xdb steps until it is 20db above the path loss of A.
Again dwelling x seconds at each db change in order to ensure stability.
Once the high side is achieved then begin adding path loss on Port B until the original path loss setting has bee achieved.
Do this same test for port B also to ensure balance for each antenna path.
Craig Warren Azimuth Systems

10. Metrics used for Acceptance
March 2005
Metrics used for Acceptance
STR / ETR “Starting Throughput Rate” / “Ending Throughput Rate” average input for starting and ending throughput in Mbps +/- x %
Upstream and downstream
Craig Warren Azimuth Systems