2.2 IEEE 802.11 Performance Gain Table
The Performance Gain Table refers to the gain setting that allows the ATWINC3400A to be compliant to 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 Wi-Fi channel and data rate combinations using the MCHPRT2 GUI
tool for optimal performance and compliance to the IEEE 802.11
specification.Note: During 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 a typical condition (3.3V, 25ºC) and at extreme voltages and temperature conditions. The ATWINC3400A device transmitter RF output power can vary by 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 IEEE 802.11 specification. For example:
- Increasing the RF output power might impact the spectral mask requirements in the IEEE 802.11b signals.
- Increasing the RF output power might impact the EVM requirements of the IEEE 802.11g/n signals.
- Below is a sample gain table that can be used as a starting point by the user. The user has to derive the Performance Gain Table for their product.
Data Rate | Channel | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | |
1 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 |
2 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 |
5.5 | -12 | -12 | -12 | -12 | -12 | -12 | -13 | -13 | -13 | -13 | -13 | -14 | -14 | -14 |
11 | -13 | -13 | -13 | -13 | -13 | -13 | -14 | -14 | -14 | -14 | -14 | -15 | -15 | -15 |
6 | -8 | -8 | -8 | -8 | -9 | -9 | -9 | -9 | -9 | -10 | -10 | -10 | -10 | -10 |
9 | -8 | -8 | -8 | -8 | -9 | -9 | -9 | -9 | -9 | -10 | -10 | -10 | -10 | -10 |
12 | -8 | -8 | -8 | -8 | -9 | -9 | -9 | -9 | -9 | -10 | -10 | -10 | -10 | -10 |
18 | -8 | -8 | -8 | -8 | -9 | -9 | -9 | -9 | -9 | -10 | -10 | -10 | -10 | -10 |
24 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 |
36 | -12 | -12 | -12 | -12 | -12 | -12 | -12 | -12 | -12 | -12 | -12 | -12 | -12 | -12 |
48 | -13 | -13 | -13 | -13 | -13 | -13 | -13 | -13 | -13 | -13 | -13 | -13 | -13 | -13 |
54 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 |
MCS0 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -11 | -11 | -11 | -11 | -11 |
MCS1 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -11 | -11 | -11 | -11 | -11 |
MCS2 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -11 | -11 | -11 | -11 | -11 |
MCS3 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -11 | -11 | -11 | -11 | -11 |
MCS4 | -11 | -11 | -11 | -11 | -12 | -12 | -12 | -12 | -12 | -12 | -12 | -12 | -12 | -12 |
MCS5 | -12 | -12 | -12 | -12 | -13 | -13 | -13 | -13 | -13 | -13 | -13 | -13 | -13 | -13 |
MCS6 | -14 | -14 | -14 | -14 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 | -15 |
MCS7 | -15 | -15 | -15 | -15 | -16 | -16 | -16 | -16 | -16 | -16 | -16 | -16 | -16 | -16 |