[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] Packet Decoder Breaking when adding noise

From: CEL
Subject: Re: [Discuss-gnuradio] Packet Decoder Breaking when adding noise
Date: Mon, 19 Nov 2018 17:44:18 +0000

Hi Matt, 

why did you use K=8, then? As far as I can see, a 16-QAM carries
log_2(16)=4 bit of data per symbol, not 8.

Also: packet decoder is in the "deprecated" category for good reason:
it randomly, non-debuggably (as far as I can tell) drops data.

While you're at it, I'd recommend replacing your WX visualization
blocks with their Qt counterparts – we've already removed WX from the
current development version of GNU Radio, and it won't be part of GNU
Radio 3.8.

Best regards,

On Mon, 2018-11-19 at 16:17 +0000, Matthew J. Brandsema wrote:
> Hello,
> Thanks for your replies!
> When I do that, the demodulator outputs unpacked bytes (0s and 1s).  I tried 
> using the “Pack K Bits” and “Unpacked to Packed” blocks separately (setting K 
> = 8) and it did not work.
> By “did not work” I mean, my input into the modulator were numbers between 0 
> and 15, and when I pack 8 bits at a time, I get numbers between 0 and 255.
> ---------------------------------------
> Matt Brandsema
> Assistant Research Professor
> Applied Research Laboratory at Penn State University
> Phone: c: (201) 259-3584 w: (814) 865-5783
> From: Achilleas Anastasopoulos [mailto:address@hidden 
> Sent: Monday, November 19, 2018 10:15 AM
> To: Matthew J. Brandsema <address@hidden>; address@hidden
> Subject: [Discuss-gnuradio] Packet Decoder Breaking when adding noise
> ...neither do you want the extended FEC encoder/decoder.
> Just send random symbols through the QAM modulator, add noise and demodulate 
> with the QAM demodulator.
> Achilleas
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

reply via email to

[Prev in Thread] Current Thread [Next in Thread]