Dear Users, For tests with WLAN, I would like to make a noise source to exactly disturb one 802.11n-channel (40MHz) with White or pink noise. My Idea is to use a linear feedback shift-register and a FIR-Filer on the FPGA. Has anyone tested such using the FPGA or GnU-Radio? I think using an FPGA would be more effective, as the high speed traffic is kept in the FPGA and the noise Does not have any timing problems, that would change the color of that noise. How to add this feature to the FPGA-Firmware?` How to implement it using GNU-Radio? Any suggestions or Ideas? Cheers, -- Ludwig Jaffe

Hi, GNU Radio certainly has a white noise generator and filtering blocks that you could use. As for FPGA acceleration, which USRP are you using? If you have a X300/X310, you can try out RFNoC [1] as an easier approach to accelerating your white noise generator / FIR filter in the FPGA. In fact, RFNoC already has a FIR filter block, you would just need to create the white noise generator. As far as I know though, you will need to do some additional processing beyond your LSFR to get white noise (as the output of a LFSR is uniform). There are many papers available on efficiently generating white noise in FPGAs that you could use for guidance. Jonathon 1. https://github.com/EttusResearch/uhd/wiki/RFNoC:-Getting-Started On Mon, May 18, 2015 at 8:25 AM, Ludwig.Jaffe--- via USRP-users <usrp-users@lists.ettus.com> wrote: > Dear Users, > > > > For tests with WLAN, I would like to make a noise source to exactly disturb > one 802.11n-channel (40MHz) with > > White or pink noise. My Idea is to use a linear feedback shift-register and > a FIR-Filer on the FPGA. > > Has anyone tested such using the FPGA or GnU-Radio? > > I think using an FPGA would be more effective, as the high speed traffic is > kept in the FPGA and the noise > > Does not have any timing problems, that would change the color of that > noise. > > > > How to add this feature to the FPGA-Firmware?` > > How to implement it using GNU-Radio? > > > > Any suggestions or Ideas? > > > > Cheers, > > -- > Ludwig Jaffe > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >

Hi Jonathon, I plan to use the B200 which has the TRX in a box chip from analog devices. The RFNoC seems to be very promising. I will have a look at that. What papers could you recommend to do lfsr white noise? Where can I git clone the complete B200 documentation (Schematics, FPGA core, Firmware if there are embedded controllers)? Thanks a lot for your advice. Ludwig -----Ursprüngliche Nachricht----- Von: Jonathon Pendlum [mailto:jonathon.pendlum@ettus.com] Gesendet: Dienstag, 19. Mai 2015 01:25 An: Jaffe Ludwig, (Ludwig.Jaffe@partner.bmw.de) Cc: usrp-users@lists.ettus.com Betreff: Re: [USRP-users] FPGA-Content to generate white noise to disturb a communication channel. Hi, GNU Radio certainly has a white noise generator and filtering blocks that you could use. As for FPGA acceleration, which USRP are you using? If you have a X300/X310, you can try out RFNoC [1] as an easier approach to accelerating your white noise generator / FIR filter in the FPGA. In fact, RFNoC already has a FIR filter block, you would just need to create the white noise generator. As far as I know though, you will need to do some additional processing beyond your LSFR to get white noise (as the output of a LFSR is uniform). There are many papers available on efficiently generating white noise in FPGAs that you could use for guidance. Jonathon 1. https://github.com/EttusResearch/uhd/wiki/RFNoC:-Getting-Started On Mon, May 18, 2015 at 8:25 AM, Ludwig.Jaffe--- via USRP-users <usrp-users@lists.ettus.com> wrote: > Dear Users, > > > > For tests with WLAN, I would like to make a noise source to exactly disturb > one 802.11n-channel (40MHz) with > > White or pink noise. My Idea is to use a linear feedback shift-register and > a FIR-Filer on the FPGA. > > Has anyone tested such using the FPGA or GnU-Radio? > > I think using an FPGA would be more effective, as the high speed traffic is > kept in the FPGA and the noise > > Does not have any timing problems, that would change the color of that > noise. > > > > How to add this feature to the FPGA-Firmware?` > > How to implement it using GNU-Radio? > > > > Any suggestions or Ideas? > > > > Cheers, > > -- > Ludwig Jaffe > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >

Hello Ludwig, the schematics are not in the git repo, but on [1]. The firmware (for the FX3 USB3 controller) is part of the UHD repo [2], and if you git clone https://github.com/EttusResearch/uhd.git cd uhd git submodule update --init you'll find the FPGA source code in the fpga-src subdirectory. I think what Jonathon meant was that the noise coming out of a LFSR isn't gaussian -- it should be white for observations shorter than the period of the generator polynomial. As a rule of thumb, if you want sufficient whiteness, you can make use of the central limit theorem, and just add up enough LFSRs with different initialization, with the sum converging against a Gaussian distribution; it's a bit hard to say what "enough" is here, as that depends on your needs. Best regards, Marcus [1] files.ettus.com/schematics [2] https://github.com/EttusResearch/uhd/ On 05/19/2015 10:48 AM, Ludwig.Jaffe--- via USRP-users wrote: > Hi Jonathon, > > I plan to use the B200 which has the TRX in a box chip from analog devices. > The RFNoC seems to be very promising. I will have a look at that. > What papers could you recommend to do lfsr white noise? > Where can I git clone the complete B200 documentation (Schematics, > FPGA core, Firmware if there are embedded controllers)? > > Thanks a lot for your advice. > > Ludwig > > > > > -----Ursprüngliche Nachricht----- > Von: Jonathon Pendlum [mailto:jonathon.pendlum@ettus.com] > Gesendet: Dienstag, 19. Mai 2015 01:25 > An: Jaffe Ludwig, (Ludwig.Jaffe@partner.bmw.de) > Cc: usrp-users@lists.ettus.com > Betreff: Re: [USRP-users] FPGA-Content to generate white noise to disturb a communication channel. > > Hi, > > GNU Radio certainly has a white noise generator and filtering blocks > that you could use. As for FPGA acceleration, which USRP are you > using? If you have a X300/X310, you can try out RFNoC [1] as an easier > approach to accelerating your white noise generator / FIR filter in > the FPGA. In fact, RFNoC already has a FIR filter block, you would > just need to create the white noise generator. As far as I know > though, you will need to do some additional processing beyond your > LSFR to get white noise (as the output of a LFSR is uniform). There > are many papers available on efficiently generating white noise in > FPGAs that you could use for guidance. > > > > Jonathon > > > 1. https://github.com/EttusResearch/uhd/wiki/RFNoC:-Getting-Started > > On Mon, May 18, 2015 at 8:25 AM, Ludwig.Jaffe--- via USRP-users > <usrp-users@lists.ettus.com> wrote: >> Dear Users, >> >> >> >> For tests with WLAN, I would like to make a noise source to exactly disturb >> one 802.11n-channel (40MHz) with >> >> White or pink noise. My Idea is to use a linear feedback shift-register and >> a FIR-Filer on the FPGA. >> >> Has anyone tested such using the FPGA or GnU-Radio? >> >> I think using an FPGA would be more effective, as the high speed traffic is >> kept in the FPGA and the noise >> >> Does not have any timing problems, that would change the color of that >> noise. >> >> >> >> How to add this feature to the FPGA-Firmware?` >> >> How to implement it using GNU-Radio? >> >> >> >> Any suggestions or Ideas? >> >> >> >> Cheers, >> >> -- >> Ludwig Jaffe >> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

As far as I know, the RFNoC is not available for the B-series. Regards, Sebastian Am 19.05.2015 um 10:48 schrieb Ludwig.Jaffe--- via USRP-users: > Hi Jonathon, > > I plan to use the B200 which has the TRX in a box chip from analog devices. > The RFNoC seems to be very promising. I will have a look at that. > What papers could you recommend to do lfsr white noise? > Where can I git clone the complete B200 documentation (Schematics, > FPGA core, Firmware if there are embedded controllers)? > > Thanks a lot for your advice. > > Ludwig > > > > > -----Ursprüngliche Nachricht----- > Von: Jonathon Pendlum [mailto:jonathon.pendlum@ettus.com] > Gesendet: Dienstag, 19. Mai 2015 01:25 > An: Jaffe Ludwig, (Ludwig.Jaffe@partner.bmw.de) > Cc: usrp-users@lists.ettus.com > Betreff: Re: [USRP-users] FPGA-Content to generate white noise to disturb a communication channel. > > Hi, > > GNU Radio certainly has a white noise generator and filtering blocks > that you could use. As for FPGA acceleration, which USRP are you > using? If you have a X300/X310, you can try out RFNoC [1] as an easier > approach to accelerating your white noise generator / FIR filter in > the FPGA. In fact, RFNoC already has a FIR filter block, you would > just need to create the white noise generator. As far as I know > though, you will need to do some additional processing beyond your > LSFR to get white noise (as the output of a LFSR is uniform). There > are many papers available on efficiently generating white noise in > FPGAs that you could use for guidance. > > > > Jonathon > > > 1. https://github.com/EttusResearch/uhd/wiki/RFNoC:-Getting-Started > > On Mon, May 18, 2015 at 8:25 AM, Ludwig.Jaffe--- via USRP-users > <usrp-users@lists.ettus.com> wrote: >> Dear Users, >> >> >> >> For tests with WLAN, I would like to make a noise source to exactly disturb >> one 802.11n-channel (40MHz) with >> >> White or pink noise. My Idea is to use a linear feedback shift-register and >> a FIR-Filer on the FPGA. >> >> Has anyone tested such using the FPGA or GnU-Radio? >> >> I think using an FPGA would be more effective, as the high speed traffic is >> kept in the FPGA and the noise >> >> Does not have any timing problems, that would change the color of that >> noise. >> >> >> >> How to add this feature to the FPGA-Firmware?` >> >> How to implement it using GNU-Radio? >> >> >> >> Any suggestions or Ideas? >> >> >> >> Cheers, >> >> -- >> Ludwig Jaffe >> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > -- Sebastian Held (Dipl.-Ing.) IMST GmbH Softwareentwickler Carl-Friedrich-Gauss-Str. 2-4 47475 Kamp-Lintfort Tel: +49 2842 981-418 Fax: +49 2842 981-199 E-mail: mailto:sebastian.held@imst.de Internet: http://www.imst.de http://webshop.imst.de Geschäftsführer: Prof. Dr.-Ing. Ingo Wolff Dr. Peter Waldow Amtsgericht Kleve HRB 6737 USt.-ID: DE 811348335 Wir weisen darauf hin, dass rechtsverbindliche Erklärungen namens unseres Hauses grundsätzlich der Unterschriften zweier ausreichend bevollmächtigter Vertreter unseres Hauses bedürfen. Wir verschicken daher keine rechtsverbindlichen Erklärungen per E-Mail an Dritte. Demgemäß nehmen wir per E-Mail auch keine rechtsverbindlichen Erklärungen oder Aufträge von Dritten entgegen. Diese E-Mail dient einzig dem unverbindlichen Informationsaustausch zwischen Sender und Empfänger. Sie entfaltet keine Rechtswirksamkeit. Diese E-Mail ist vertraulich zu behandeln. Sollten Sie nicht der vorgesehene Empfänger sein, bitten wir Sie, den Versender zu informieren und die Nachricht zu löschen. Die Weitergabe sowie Vervielfältigung, Verwertung und Mitteilung seines Inhalts ist nur mit unserer ausdrücklichen Genehmigung gestattet. Alle Rechte vorbehalten, insbesondere für den Fall der Schutzrechtsanmeldung. This document has to be treated confidentially. If you are not the intended recipient, please immediately notify the sender and delete this message. Its contents are not to be passed on, duplicated, exploited or disclosed without our expressed permission. All rights reserved, especially the right to apply for protective rights.

On 19.05.2015 02:57, Sebastian Held via USRP-users wrote: > As far as I know, the RFNoC is not available for the B-series. This is correct. RFNoC is Gen-3 and beyond (so right now, E3x0 and X3x0). Cheers, Martin > > Regards, > Sebastian > > Am 19.05.2015 um 10:48 schrieb Ludwig.Jaffe--- via USRP-users: >> Hi Jonathon, >> >> I plan to use the B200 which has the TRX in a box chip from analog devices. >> The RFNoC seems to be very promising. I will have a look at that. >> What papers could you recommend to do lfsr white noise? >> Where can I git clone the complete B200 documentation (Schematics, >> FPGA core, Firmware if there are embedded controllers)? >> >> Thanks a lot for your advice. >> >> Ludwig >> >> >> >> >> -----Ursprüngliche Nachricht----- >> Von: Jonathon Pendlum [mailto:jonathon.pendlum@ettus.com] >> Gesendet: Dienstag, 19. Mai 2015 01:25 >> An: Jaffe Ludwig, (Ludwig.Jaffe@partner.bmw.de) >> Cc: usrp-users@lists.ettus.com >> Betreff: Re: [USRP-users] FPGA-Content to generate white noise to disturb a communication channel. >> >> Hi, >> >> GNU Radio certainly has a white noise generator and filtering blocks >> that you could use. As for FPGA acceleration, which USRP are you >> using? If you have a X300/X310, you can try out RFNoC [1] as an easier >> approach to accelerating your white noise generator / FIR filter in >> the FPGA. In fact, RFNoC already has a FIR filter block, you would >> just need to create the white noise generator. As far as I know >> though, you will need to do some additional processing beyond your >> LSFR to get white noise (as the output of a LFSR is uniform). There >> are many papers available on efficiently generating white noise in >> FPGAs that you could use for guidance. >> >> >> >> Jonathon >> >> >> 1. https://github.com/EttusResearch/uhd/wiki/RFNoC:-Getting-Started >> >> On Mon, May 18, 2015 at 8:25 AM, Ludwig.Jaffe--- via USRP-users >> <usrp-users@lists.ettus.com> wrote: >>> Dear Users, >>> >>> >>> >>> For tests with WLAN, I would like to make a noise source to exactly disturb >>> one 802.11n-channel (40MHz) with >>> >>> White or pink noise. My Idea is to use a linear feedback shift-register and >>> a FIR-Filer on the FPGA. >>> >>> Has anyone tested such using the FPGA or GnU-Radio? >>> >>> I think using an FPGA would be more effective, as the high speed traffic is >>> kept in the FPGA and the noise >>> >>> Does not have any timing problems, that would change the color of that >>> noise. >>> >>> >>> >>> How to add this feature to the FPGA-Firmware?` >>> >>> How to implement it using GNU-Radio? >>> >>> >>> >>> Any suggestions or Ideas? >>> >>> >>> >>> Cheers, >>> >>> -- >>> Ludwig Jaffe >>> >>> >>> _______________________________________________ >>> USRP-users mailing list >>> USRP-users@lists.ettus.com >>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> > > -- > > Sebastian Held (Dipl.-Ing.) > IMST GmbH > Softwareentwickler > > Carl-Friedrich-Gauss-Str. 2-4 > 47475 Kamp-Lintfort > Tel: +49 2842 981-418 > Fax: +49 2842 981-199 > E-mail: mailto:sebastian.held@imst.de > Internet: http://www.imst.de > > http://webshop.imst.de > > Geschäftsführer: > Prof. Dr.-Ing. Ingo Wolff > Dr. Peter Waldow > Amtsgericht Kleve HRB 6737 > USt.-ID: DE 811348335 > > Wir weisen darauf hin, dass rechtsverbindliche Erklärungen namens > unseres Hauses grundsätzlich der Unterschriften zweier ausreichend > bevollmächtigter Vertreter unseres Hauses bedürfen. Wir verschicken > daher keine rechtsverbindlichen Erklärungen per E-Mail an Dritte. > Demgemäß nehmen wir per E-Mail auch keine rechtsverbindlichen > Erklärungen oder Aufträge von Dritten entgegen. Diese E-Mail dient > einzig dem unverbindlichen Informationsaustausch zwischen Sender und > Empfänger. Sie entfaltet keine Rechtswirksamkeit. > Diese E-Mail ist vertraulich zu behandeln. Sollten Sie nicht der > vorgesehene Empfänger sein, bitten wir Sie, den Versender zu informieren > und die Nachricht zu löschen. Die Weitergabe sowie Vervielfältigung, > Verwertung und Mitteilung seines Inhalts ist nur mit unserer > ausdrücklichen Genehmigung gestattet. Alle Rechte vorbehalten, > insbesondere für den Fall der Schutzrechtsanmeldung. > This document has to be treated confidentially. If you are not the > intended recipient, please immediately notify the sender and delete this > message. Its contents are not to be passed on, duplicated, exploited or > disclosed without our expressed permission. All rights reserved, > especially the right to apply for protective rights. > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >