GNU Radio Companion - How to calculate average power of a signal

Question

How can I calculate the average power of a signal within a certain bandwidth and store that value in a variable that I can reference for later?

For example, I have a low pass filter 15kHz wide, I want to know if there's a tool in GNU Radio Companion that will allow me to calculate the average power over a certain time to see if the power level passes a threshold.

Answer 1

The power of a digital signal is simply . Thus in order to do the following:

calculate the average power

• use the "complex to magnitude square" block to convert your signal to signal power

over a certain time

• use the "moving average" block to calculate the moving average of a specific time slice

see if the power level passes a threshold

• use the "threshold" block to calculate... you guessed it, the threshold.

Have you read the tutorials? http://tutorials.gnuradio.org