Re: [Discuss-gnuradio] Customized Block Giving Incorrect Output

[Tellrell White]

Michael

Thanks for the response. That's exactly what I'm trying to accomplish.  You mention the "complex to ||^2 can be vectorized. My question is how exactly do you go about doing that?

Tellrell

On Mon, Feb 12, 2018 at 9:42 AM, Michael Dickens <address@hidden> wrote:

Hi Tellrell - So I'm not sure about the non-sim error / issue, but to me the larger question is: what are you really trying to do? If you're trying to detect energy via converting an FFT vector output to dB and thresholding, on a specific number of items per FFT, then why not just use vectors throughout to guarantee the # of items is as desired? The FFT block is, of course, vectorized; so is the "complex to ||^2" block (or, rather it can be; you're not currently using it in this manner). Then, you set the energy detector to take in 1 vector of length N (same-same as the FFT and ||^2) & you're good to go. Maybe I'm missing something? Hope this is useful. - MLD

On Sun, Feb 11, 2018, at 9:00 PM, Tellrell White wrote:

I've created a customized block that takes in a number of input items and once that number of input items surpasses a certain number, 1024 of the input items are taken and stored into a list, and then those items are converted to dB and lastly compared to a threshold value. If any of the values are greater than the threshold value, a message is printed indicating a signal is present, and if none of the values are greater than the threshold, this is indicated with a message stating "No signal is present". I've tested the block in both simulation and currently, I'm testing the block over the air using the N210. The block performed correctly in simulation, however, over the air, the block gives a response of "no signal present" regardless of the input. The error message " 

python: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0

also printed during runtime. Any suggestions are welcome. Both the simulation flow graph and the flow graph used over the air are attached.