3 IEEE 802.11 Performance Gain Table

The Performance Gain Table refers to the gain setting that allows the ATWINC15x0 to be compliant to meet the limits set in the IEEE 802.11 specification.
  • The product characterization of the TX and RX parameters, as defined by IEEE 802.11, must be tested with a suitable WLAN test instrument, for example, IQxel-80.
  • During the characterization, the user has to derive the Performance Gain Table by adjusting the Digital Gain (DG) value for all of the RF channel and data rate combinations using the MCHPRT2 GUI tool for optimal performance and compliance to the IEEE 802.11 specification.
    Note: During the transmitter EVM measurements, the test equipment must use the “LTF” channel estimation as required by the IEEE 802.11 specification.
  • The product characterization can be done at the typical condition (3.3V, 25ºC) and at extreme voltages and temperature conditions also. The ATWINC15x0 device transmitter RF output power can vary about 2 to 3 dB at extreme boundary conditions from its typical value.
  • The final Performance Gain Table is derived after characterizing the product across operating voltage and temperature conditions.
    Note: There is a trade-off between the transmitter RF output power and compliance to the IEEE 802.11 specification. For example:
    1. Increasing the RF output power might impact the spectral mask requirements in the IEEE 802.11b signals.
    2. Increasing the RF output power might impact the EVM requirements of the IEEE 802.11g/n signals.
  • Below is a sample gain table that the user can use as a starting point. The user has to derive the Performance Gain Table for their product.
Table 3-1. Sample IEEE 802.11 Performance Gain Table
Data RateChannel
1234567891011121314
1-12-12-12-12-12-12-12-12-12-12-12-12-12-12
2-12-12-12-12-12-12-12-12-12-12-12-12-12-12
5.5-10-10-10-10-10-10-10-10-10-10-10-10-10-10
11-10-10-10-10-10-10-10-10-10-10-10-10-10-10
6-3-3-3-3-3-3-3-3-3-3-3-3-3-3
9-3-3-3-3-3-3-3-3-3-3-3-3-3-3
12-3-3-3-3-3-3-3-3-3-3-3-3-3-3
18-3-3-3-3-3-3-3-3-3-3-3-3-3-3
24-3-3-3-3-3-3-3-3-3-3-3-3-3-3
36-3-3-3-3-3-3-3-3-3-3-3-3-3-3
48-6-6-6-6-6-6-6-6-6-6-6-6-6-6
54-9-9-9-9-9-9-9-9-9-9-9-9-9-9
MCS 0-3-3-3-3-3-3-3-3-3-3-3-3-3-3
MCS 1-3-3-3-3-3-3-3-3-3-3-3-3-3-3
MCS 2-3-3-3-3-3-3-3-3-3-3-3-3-3-3
MCS 3-4-4-4-4-4-4-4-4-4-4-4-4-4-4
MCS 4-5-5-5-5-5-5-5-5-5-5-5-5-5-5
MCS 5-6-6-6-6-6-6-6-6-6-6-6-6-6-6
MCS 6-8-8-8-8-8-8-8-8-8-8-8-8-8-8
MCS 7-12-12-12-12-12-12-12-12-12-12-12-12-12-12