Hi Tellrell, > I know you can find the PSD Ah, so you're actually after a PSD estimate – It wasn't clear to me what you were looking for, because the FFT-> frequency sink flowgraph didn't make sense. And you just said "average energy" (not "average energy over frequencies"), so I was kind of confused; sorry!
> So, ultimately, if the way that I'm implementing the algorithm is > correct thus far, I'm looking for a way to display(graphically or > otherwise) my result or the avg power. It's impossible to say whether an algorithm is correct without specifying what it should be doing - so maybe we need to take a step back: 1. you want to do detection of IEEE 802.15.4 signals. Which PHY are we talking about? There's multiple physical layers for that standard. The DSSS types aren't really … friendly towards energy detection at all. 2. pure DFT-bases spectral estimation without preprocessing or postprocessing is usually not the optimum method for signals that don't have a spectral sinc shape; they're just easy to implement. Usually, you'd try to detect using as much info about what the signal of interest is as possible – especially in the presence of other systems. Best regards, Marcus On 09/21/2017 11:32 AM, Tellrell White wrote: > Thanks for the replies guys > > Marcus I know you can find the PSD of a signal in both the time and > frequency domain. The only reason I'm choosing to use the frequency > domain is because it was one of the earlier methods that I learned > about. That's really all. From the archives I've read about people > trying to implement energy detectors in GNU Radio for various > applications but I never saw anybody display the results in any way or > form. They mostly just send the statistics to a file sink and export > to matlab or some other software for further processing. So, > ultimately, if the way that I'm implementing the algorithm is correct > thus far, I'm looking for a way to display(graphically or otherwise) > my result or the avg power. > > Nathan would you remove the vector to stream block as well? And, why > would you have to remove the stream to vector block? Isn't that the > format that I want the data in? Also, how do you go about adding > "vector modes" to the remaining blocks? > > Tellrell > > On Thu, Sep 21, 2017 at 1:30 PM, West, Nathan > <n...@ostatemail.okstate.edu <mailto:n...@ostatemail.okstate.edu>> wrote: > > You can use the qt gui vector plot to plot a vector. That means > removing the stream to vector block. You might have to add > "vector" modes to some blocks to do the other operations you want. > > On Wed, Sep 20, 2017 at 6:31 PM, Tellrell White > <t_whit...@yahoo.com <mailto:t_whit...@yahoo.com>> wrote: > > Hello Marcus > You are absolutely correct. Is there an existing sink that > would allow me to display avg power given some threshold ? > > Tellrell > > > On Wednesday, September 20, 2017 5:54 PM, Marcus Müller > <marcus.muel...@ettus.com <mailto:marcus.muel...@ettus.com>> > wrote: > > > Hi Tellrell! > Why should both plots show the same? You send in completely > different signals! > Best regards, > Marcus > > On 09/20/2017 09:27 AM, Tellrell White wrote: > Hello All > I'm working on a project involving signal detection of an IEEE > 802.15.4 waveform using energy detection. > The algorithm for energy detection goes as follows: > > A/D conversion -> FFT -> mag^2 -> (1/N) ^ M -> > threshold comparison > > Currently, I'm doing simulations in gnuradio companion with a > focus of just trying to construct the the algorithm and get an > output. Below I've attached the current flowgraph i'm using > along with screen shots of the flowgraph and the outputs from > the fft sinks. > > In the flowgraph i'm using gaussian noise as my source. I send > this noise to both an FFT sink and also through the energy > detection algorithm. My expectation is that both sinks will > give me the same result, however, the output coming from the > algorithm doesn't match the other sink and I'm currently now > sure why this is. Are there some blocks I'm currently missing > and/or is the FFT sink an incorrect way of trying to display > the power coming from the energy detection algorithm? > > Any suggestions are welcome. > > Regards > Tellrell > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org <mailto:Discuss-gnuradio@gnu.org> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> > > _______________________________________________ > Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org > <mailto:Discuss-gnuradio@gnu.org> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> > _______________________________________________ > Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org > <mailto:Discuss-gnuradio@gnu.org> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> > > _______________________________________________ Discuss-gnuradio > mailing list Discuss-gnuradio@gnu.org > <mailto:Discuss-gnuradio@gnu.org> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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