If we want to use GS2100MIP module as wearable device and we want to comply with SAR exclusion I understood that our software should limit TX power below 9.8dBm. How we do that in practice?

The transmit duty cycle makes a big difference in the power level you can use. A duty cycle of 10% means you can transmit at a 10db higher level than a 100% application. The specific application makes a big difference.

 

Specific power reduction command is AT+WP:

AT+WP=<n1><n2>,<n3>,<n4>,<n5>

Where,

n1 - Reduce the power in gain steps from the maximum power for 802.11b rates: 1, 2, 5.5, 11M

n2 - Reduce the power in gain steps from the maximum power for 802.11g_low rates: 6, 9, 12, 18M

n3 - Reduce the power in gain steps from the maximum power for 802.1111g_hi rates: 24, 36, 48, 54M

n4 - Reduce the power in gain steps from the maximum power for 802.11n_low rates: MCS 0, 1, 2, 3

n5 - Reduce the power in gain steps from the maximum power for 802.11n_hi rates: MCS 4, 5, 6, 7

 

Example:

AT+WP=0,0,0,0,2

This will reduce high 802.11n rates by 2 gain steps, and leave other rates at their GCT (Gain Control Table) maximum.

The gain step size averages about 1.6db per step, at least for the first few steps of reduction. Beyond that, it is not well tested.

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