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adjacentlink / emane

Distributed wireless network emulation framework
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Understanding PHY layer calculations #230

Closed vivianchiong closed 1 year ago

vivianchiong commented 1 year ago

Hello,

Isn't the rxSensitivity calculated here technically noise floor?

If we want rxSensitivity, the calculation is missing a term ebN0 -- i.e. we should be discarding the packet if the rxPower is less than the sum of (−174 + noiseFigure + 10log(bandWidth)) + some ebN0 term (e.g. 4 dB).

Is there an error in my understanding?

Thank you so much!

sgalgano commented 1 year ago

The Rx Sensitivity calculation in the emulator physical layer is used as a threshold to determine the lowest receive power for a signal to be detected. If that threshold is met, the frame is passed up to the radio model to determine, based on its specific receive logic, if the frame is properly received. Adding an C/N term (i.e. ebNo) implies a determination of the minimum receive power necessary to achieve a minimum level of completion confidence associated with the C/N term.

vivianchiong commented 1 year ago

Thank you!