Re: [Discuss-gnuradio] QPSK over air
Hi Mark, the gr-dvbt has a QPSK, QAM-16 and QAM-64 implementation of constellation for both Tx/Rx. The standard it implements is ETSI 300 744 which is OFDM based in which each subcarier is modulated using the modulations above. Regards, Bogdan On Tuesday, February 25, 2014 8:12 PM, "SOUTHCOTT, MARK A CIV USAF AFMC AFRL/RITC" wrote: I’m looking for an example of a higher-order modulation implemented successfully in GNU Radio with an SDR frontend. I’ve seen bpsk, GMSK, etc. implemented over a wireless channel, but I’ve only seen simulations of higher-order modulations. Could someone point me towards one or confirm that there’s no examples? Mark ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] QPSK over air
Only half of the solution, but there's a fully functional 64-QAM transmitter for bladeRF here: https://github.com/argilo/gr-qam It implements the North American CATV standard ANSI/SCTE07 also known as ITU-T J.83 Annex B. We're just using cable ready TV's as receivers. Ron On 2/25/2014 10:11 AM, SOUTHCOTT, MARK A CIV USAF AFMC AFRL/RITC wrote: I'm looking for an example of a higher-order modulation implemented successfully in GNU Radio with an SDR frontend. I've seen bpsk, GMSK, etc. implemented over a wireless channel, but I've only seen simulations of higher-order modulations. Could someone point me towards one or confirm that there's no examples? Mark ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] QPSK over air
On Tue, Feb 25, 2014 at 3:04 PM, Martin Braun wrote: > On 02/25/2014 07:17 PM, Aditya Dhananjay wrote: >> Hi Mark, >> >> The problem is that GNU Radio does not have equalizers that can perform >> sufficiently well for constellations such as 64-QAM. As far as I know, >> the only one present is a simple decision feedback equalizer. >> >> I'm working on implementing a few equalizers: a) 2D Triangulation, and >> b) Whittaker-Shannon Sinc interpolator, and c) one of my own. >> >> These aren't yet ready to share, but once they are, I will send out an >> email to the list. > > Yeah, that's a good point :) > What we have in stock GR should work up to 8-PSK, but higher than that, > they will probably be the limiting factor. > > M The lms_dd_equalizer should work fine for any constellation, for some definition of 'fine'. Tom ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] QPSK over air
On 02/25/2014 07:17 PM, Aditya Dhananjay wrote: > Hi Mark, > > The problem is that GNU Radio does not have equalizers that can perform > sufficiently well for constellations such as 64-QAM. As far as I know, > the only one present is a simple decision feedback equalizer. > > I'm working on implementing a few equalizers: a) 2D Triangulation, and > b) Whittaker-Shannon Sinc interpolator, and c) one of my own. > > These aren't yet ready to share, but once they are, I will send out an > email to the list. Yeah, that's a good point :) What we have in stock GR should work up to 8-PSK, but higher than that, they will probably be the limiting factor. M ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] QPSK over air
On 02/25/2014 07:11 PM, SOUTHCOTT, MARK A CIV USAF AFMC AFRL/RITC wrote: > I’m looking for an example of a higher-order modulation implemented > successfully in GNU Radio with an SDR frontend. I’ve seen bpsk, GMSK, > etc. implemented over a wireless channel, but I’ve only seen simulations > of higher-order modulations. Could someone point me towards one or > confirm that there’s no examples? Mark, check out files in gr-digital/examples/narrowband and -demod. QPSK and 8-PSK will work out-of-the-box, people have done that ota, too (I've done it inside the OFDM code, for example). M ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] QPSK over air
Hi Mark, The problem is that GNU Radio does not have equalizers that can perform sufficiently well for constellations such as 64-QAM. As far as I know, the only one present is a simple decision feedback equalizer. I'm working on implementing a few equalizers: a) 2D Triangulation, and b) Whittaker-Shannon Sinc interpolator, and c) one of my own. These aren't yet ready to share, but once they are, I will send out an email to the list. Best, Aditya On Tue, Feb 25, 2014 at 1:11 PM, SOUTHCOTT, MARK A CIV USAF AFMC AFRL/RITC < mark.southcot...@us.af.mil> wrote: > I'm looking for an example of a higher-order modulation implemented > successfully in GNU Radio with an SDR frontend. I've seen bpsk, GMSK, etc. > implemented over a wireless channel, but I've only seen simulations of > higher-order modulations. Could someone point me towards one or confirm > that there's no examples? > > > > Mark > > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] QPSK over air
I'm looking for an example of a higher-order modulation implemented successfully in GNU Radio with an SDR frontend. I've seen bpsk, GMSK, etc. implemented over a wireless channel, but I've only seen simulations of higher-order modulations. Could someone point me towards one or confirm that there's no examples? Mark ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
