On Mon, Mar 23, 2009 at 11:04 AM, kaleem ahmad <kaleem_...@yahoo.com> wrote: > > Thanks Brian, > > By cycle time I mean that a transmitter (e.g. FSK, ZigBee or any other) is > transmitting something (I am not interested what is being transmitted) after > fixed time intervals let say 50ms. Now this transmitter will continue > transmitting data after every 50ms. This 50ms is the cycle time.
Keep it in the time domain and just do RSSI estimation. Then count the number of samples between high power and no power input. This should work well for high SNR situations. If you need to work in lower SNR situations, you can perform some other operations on the signal to detect if there is something there that resembles a digital signal (an exercise left to the reader). You definitely don't need to move to the frequency domain and should probably be avoided. As for your ADC question, it's just doing filtering with decimation. The actual ADC sample rate stays the same, but your signal is digitally filtered and samples thrown away. The filtering avoids aliasing that occurs when you throw samples away. Good luck. Brian _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
