Hi Jorge, a couple of observations first:- the "throttle" block needs to be part of the actual flowgraph to have any effect. You might want to remove your null source -> throttle -> null sink chain. - for the sake of a Minimum Working Example (MWE) I suggest to remove the file sink and virtual sinks as well. - Did you check the actual sample level on the "OFDM Transmitter" output port? I suspect these values do not have a mean energy of 1 but way less. In your case probably 1/sqrt(64). You'd need to adopt the "Noise Voltage" parameter in your "Channel Model" block accordingly.
- How did you compute your SNR value? - As long as there's noise, you'd eventually lose packets.
Cheers JohannesOn 13.07.23 20:08, JORGE GONZALEZ ORELLANA via GNU Radio, the Free & Open-Source Toolkit for Software Radio wrote:
As you can see, it's the basic implementation of OFDM.My goal it's to measure the BER, but as I mentioned earlier, below certain level or SNR (20dB)El jue, 13 jul 2023 a las 8:05, Marcus Müller (<mmuel...@gnuradio.org <mailto:mmuel...@gnuradio.org>>) escribió:Hi Jorge, yes, please share your flowgraph. It's moot even beginning talking about it without knowing it. Best regards, Marcus On 12.07.23 20:53, JORGE GONZALEZ ORELLANA via GNU Radio, the Free & Open-Source Toolkit for Software Radio wrote: > Hello everyone, I have some question related with a OFDM transmission simulation, in > particular, about losing packets. > > I am using the OFDM Transmitter and Receiver blocks to do the transmission (if you need > more details, I can upload an image of the flowgraph). > > The problem that I get is when put some noise (to get some level of SNR), when I have > about 20dB (or more) of SNR I don't lose any packet, but if I put less than 20dB of SNR, > almost all packets gets lost, (just 1 or 2 packets are received), all of this happen over > simulation. > > Any suggestions on why this might happen?
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