iq rssi db signed value

[rookiebeotch]

in rssi.v the iq_rssi_half_db is defined as signed 9 bit value.

In vivado ILA i see this value as non negative but it decreases as rf signal goes higher. it acts like a negative number but MSB isn't 1

wanted to confirm that this calculation is supposed to be negative for low signals like -80dBm.

[JiaoXianjun]

If I remember correctly, iq rssi means sth proportional to the iq amplitude.
But please remember that between rf signal and the iq sample, there is gc (gain control) in between playing. So I suggest turning off AGC? https://github.com/open-sdr/openwifi/blob/master/doc/app_notes/frequent_trick.md#Rx-gain-config