Re: [Discuss-gnuradio] BER AWGN example - question
Martin Braun (CEL) wrote Given an E_b of 1, what is the noise *voltage* (i.e. the expected amplitude of the AWGN process) that will cause an E_b / N_0 of x, if E_b / N_0 is given in dB? If you take pencil and paper, and solve for the noise voltage, you'll get this equation. Thank you very much for your reply. I am capable of simple converting value in [dB] to the one in [W/W] but I don't know why there are the number_of_bits_per_symbol parameter and the '2' constant in the equation. It's probably trivial but I would really appreciate your help on this. Best Regards, Piotr Bieńkowski -- View this message in context: http://gnuradio.4.n7.nabble.com/BER-AWGN-example-question-tp45261p45279.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] BER AWGN example - question
On Mon, Dec 09, 2013 at 03:10:49AM -0800, bieniu wrote: Martin Braun (CEL) wrote Given an E_b of 1, what is the noise *voltage* (i.e. the expected amplitude of the AWGN process) that will cause an E_b / N_0 of x, if E_b / N_0 is given in dB? If you take pencil and paper, and solve for the noise voltage, you'll get this equation. Thank you very much for your reply. I am capable of simple converting value in [dB] to the one in [W/W] but I don't know why there are the number_of_bits_per_symbol parameter and the '2' constant in the equation. It's probably trivial but I would really appreciate your help on this. The number_of_bits_per_symbol is for E_s - E_b conversion and the 2 is for two-sided noise power to one-sided conversion (or was is the other way 'round? I always mix those up :). MB -- Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin Braun Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association pgpJMSA2c9Q4W.pgp Description: PGP signature ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] BER AWGN example - question
Thank you very much :) BR, Piotr Bieńkowski -- View this message in context: http://gnuradio.4.n7.nabble.com/BER-AWGN-example-question-tp45261p45282.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] BER AWGN example - question
On Sat, Dec 07, 2013 at 02:26:18PM +0100, bie...@student.agh.edu.pl wrote: Could you explain how the converting the EbNo value to the noise voltage in the following example is done? http://gnuradio.org/redmine/projects/gnuradio/repository/entry/gr-digital/examples/berawgn.py I can see that there is a function (EbNo_to_noise_voltage) responsible for that but I have problem with understanding where this equation came from. Could you possibly explain it to me or at least recommend some book where I can find the solution? Given an E_b of 1, what is the noise *voltage* (i.e. the expected amplitude of the AWGN process) that will cause an E_b / N_0 of x, if E_b / N_0 is given in dB? If you take pencil and paper, and solve for the noise voltage, you'll get this equation. MB -- Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin Braun Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association pgp59p2DaRGRH.pgp Description: PGP signature ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
