Can we limit receiver sensibility to improve robustness?

[simmania]

Suppose we have a short distance communication between two nRF52840 devices.
And suppose the receiver receives radio waves from other devices disturbing the connection (like a magnetron or other 2.4GHz based protocols).

Can we in that case limit the receiver sensibility so that the receiver mainly receives the packets from our sending device (which is close to the receiver)?

That would make the connection much more robust for unwanted interferance.

[ketiljo]

The receiver have AGC, automatic gain control, so the gain will be adjusted down if there's strong signal source near by to avoid overloading the receiver. This is done automatically by the receiver, 

[simmania]

So what happens if the receiver is in the middle of receiving a packet with low power and a packet from some other transmitter with more power is starting transmission?

Will the low power packet be aborted and will the high power packet be received correctly?

[ketiljo]

Only one packet can be recieived at the same time. When a packet reception is started, and a stonger signal disrupts this, the CRC of the packet will fail and the packet will be discarded. The received can't distinguish between data from different sources. The BLE protocoll will make sure it's resent so no packets will be lost. Collitions happens all the time in the crowded 2.4 GHz band