How to calculate the received power

[nadhira]

Hello.  i want to check the rx power in the labview. I set the tone frequency is 15kHz and carrier freq 2 GHz. at the Tx, the amplitude is 0.7 dB. But at the Rx, the highest power is at the 0 kHz (around 65dB), while the 15 kHz's power is almost similar with other frequency (around -80dB). How should I check the Rx power correctly?