Re: [Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1
> > Hello Marcus thanks for your reply.. Well the problem is there is not much > documentation available on internet on usurp .. Also I am quite new to gnu > radio and usrp1 ... I tried to play with interpolation and decimation > settings but didnot get the desired ofdm signal .. I am not sure what else I > can do to fix this problem . If u know any documentation regarding that > please do let me know . U mentioned about UHd but I could not find any UHd > blocks in gnu radio .. As I saw in one example someone use UHd .. Iam using > Ubuntu 10.10 and gnu radio companion 3.2.2 version .. I will really > appreciate if u can guide me how to setup the settings or specs i need for > usrp 1 .. Thanks and regards... > > Try using: http://www.sbrac.org/files/build-gnuradio On your Ubuntu platform. It will build and install everything required for a modern UHD-supporting Gnu Radio environment. While I agree that documentation is sparse, the problems with your flow-graph indicate to me problems at a conceptual level. Have you looked at the GRC Tutorials? www.csun.edu/~skatz/katzpage/sdr_project/sdr/grc_*tutorial*1.pdf Also: http://gnuradio.org/redmine/projects/gnuradio/wiki/Tutorials And: http://gnuradio.org/redmine/projects/gnuradio/wiki/HowToUse And: http://gnuradio.org/redmine/projects/gnuradio/wiki/GNURadioCompanion And: http://gnuradio.org/redmine/projects/gnuradio/wiki/TutorialsWritePythonApplications But if you don't really have a clear notion of what interpolation and decimation are all about, none of the above will be of much help. You need a basic introduction to Digital Signal Processing, and going down the Gnu Radio path isn't a substitute for such background. -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1
Hello Marcus thanks for your reply.. Well the problem is there is not much documentation available on internet on usurp .. Also I am quite new to gnu radio and usrp1 ... I tried to play with interpolation and decimation settings but didnot get the desired ofdm signal .. I am not sure what else I can do to fix this problem . If u know any documentation regarding that please do let me know . U mentioned about UHd but I could not find any UHd blocks in gnu radio .. As I saw in one example someone use UHd .. Iam using Ubuntu 10.10 and gnu radio companion 3.2.2 version .. I will really appreciate if u can guide me how to setup the settings or specs i need for usrp 1 .. Thanks and regards... Marcus D. Leech wrote: > >> >> hi Marcus, >> >> I am attaching the screen shots and also block diagram of transmitter.. >> right now i am just trying to look for transmission of OFDM signal via >> usrp1. As i mentioned earlier in the fft scope plot in gnu radio i see >> the >> typical ofdm signal but on the other hand in usrp sink on the spectrum >> analyser i saw only simple sine wave peak. please have a look and let me >> know if there is something else do i need to do to generate the proper >> ofdm >> signal on the spectrum analyser. >> >> /home/hp/Desktop/spectrumoutput.jpeg >> http://old.nabble.com/file/p32675018/spectrumoutput.jpeg >> spectrumoutput.jpeg >> >> >> >> Block diagram in GNU radio >> /home/hp/Documents/finaltesting.grc >> http://old.nabble.com/file/p32675018/finaltesting.grc finaltesting.grc >> > Your flow-graph appears to be badly confused about bandwidths and > interpolations and sample rates > --an interpolation ratio on your USRP1 sink of 100e6 is almost > certainly *not* what you had in mind. > > You probably need to learn more about all of that, and get some better > notions of how the OFDM > modulator block works. At the very least you'll need to > fractionally-interpolate the baseband > up to some sample rather that *can* reasonably be further interpolated > by the USRP1 hardware. > > Given how simple this graph currently is, I'd *strongly* suggest that > you upgrade your "world" to UHD, > since your investment in the "old world" is still rather small. > > >> >> > -- > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://old.nabble.com/OFDM-Transmiter-and-receiver-by-using-USRP1-tp32662445p32677138.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] OFDM Transmiter and receiver by using USRP1
Hello Marcus thanks for your reply.. Well the problem is there is not much documentation available on internet on usurp .. Also I am quite new to gnu radio and usrp1 ... I tried to play with interpolation and decimation settings but didnot get the desired ofdm signal .. I am not sure what else I can do to fix this problem . If u know any documentation regarding that please do let me know . U mentioned about UHd but I could not find any UHd blocks in gnu radio .. As I saw in one example someone use UHd .. Iam using Ubuntu 10.10 and gnu radio companion 3.2.2 version .. I will really appreciate if u can guide me how to setup the settings or specs i need for usrp 1 .. Thanks and regards... Marcus D. Leech wrote: > >> >> hi Marcus, >> >> I am attaching the screen shots and also block diagram of transmitter.. >> right now i am just trying to look for transmission of OFDM signal via >> usrp1. As i mentioned earlier in the fft scope plot in gnu radio i see >> the >> typical ofdm signal but on the other hand in usrp sink on the spectrum >> analyser i saw only simple sine wave peak. please have a look and let me >> know if there is something else do i need to do to generate the proper >> ofdm >> signal on the spectrum analyser. >> >> /home/hp/Desktop/spectrumoutput.jpeg >> http://old.nabble.com/file/p32675018/spectrumoutput.jpeg >> spectrumoutput.jpeg >> >> >> >> Block diagram in GNU radio >> /home/hp/Documents/finaltesting.grc >> http://old.nabble.com/file/p32675018/finaltesting.grc finaltesting.grc >> > Your flow-graph appears to be badly confused about bandwidths and > interpolations and sample rates > --an interpolation ratio on your USRP1 sink of 100e6 is almost > certainly *not* what you had in mind. > > You probably need to learn more about all of that, and get some better > notions of how the OFDM > modulator block works. At the very least you'll need to > fractionally-interpolate the baseband > up to some sample rather that *can* reasonably be further interpolated > by the USRP1 hardware. > > Given how simple this graph currently is, I'd *strongly* suggest that > you upgrade your "world" to UHD, > since your investment in the "old world" is still rather small. > > >> >> > -- > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://old.nabble.com/OFDM-Transmiter-and-receiver-by-using-USRP1-tp32662445p32677136.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] OFDM Transmiter and receiver by using USRP1
Hello Marcus thanks for your reply.. Well the problem is there is not much documentation available on internet on usurp .. Also I am quite new to gnu radio and usrp1 ... I tried to play with interpolation and decimation settings but didnot get the desired ofdm signal .. I am not sure what else I can do to fix this problem . If u know any documentation regarding that please do let me know . U mentioned about UHd but I could not find any UHd blocks in gnu radio .. As I saw in one example someone use UHd .. Iam using Ubuntu 10.10 and gnu radio companion 3.2.2 version .. I will really appreciate if u can guide me how to setup the settings or specs i need for usrp 1 .. Thanks and regards... Marcus D. Leech wrote: > >> >> hi Marcus, >> >> I am attaching the screen shots and also block diagram of transmitter.. >> right now i am just trying to look for transmission of OFDM signal via >> usrp1. As i mentioned earlier in the fft scope plot in gnu radio i see >> the >> typical ofdm signal but on the other hand in usrp sink on the spectrum >> analyser i saw only simple sine wave peak. please have a look and let me >> know if there is something else do i need to do to generate the proper >> ofdm >> signal on the spectrum analyser. >> >> /home/hp/Desktop/spectrumoutput.jpeg >> http://old.nabble.com/file/p32675018/spectrumoutput.jpeg >> spectrumoutput.jpeg >> >> >> >> Block diagram in GNU radio >> /home/hp/Documents/finaltesting.grc >> http://old.nabble.com/file/p32675018/finaltesting.grc finaltesting.grc >> > Your flow-graph appears to be badly confused about bandwidths and > interpolations and sample rates > --an interpolation ratio on your USRP1 sink of 100e6 is almost > certainly *not* what you had in mind. > > You probably need to learn more about all of that, and get some better > notions of how the OFDM > modulator block works. At the very least you'll need to > fractionally-interpolate the baseband > up to some sample rather that *can* reasonably be further interpolated > by the USRP1 hardware. > > Given how simple this graph currently is, I'd *strongly* suggest that > you upgrade your "world" to UHD, > since your investment in the "old world" is still rather small. > > >> >> > -- > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://old.nabble.com/OFDM-Transmiter-and-receiver-by-using-USRP1-tp32662445p32677135.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] OFDM Transmiter and receiver by using USRP1
On Oct 18, 2011, at 11:18 AM, "Marcus D. Leech" wrote: >> >> hi Marcus, >> >> I am attaching the screen shots and also block diagram of transmitter.. >> right now i am just trying to look for transmission of OFDM signal via >> usrp1. As i mentioned earlier in the fft scope plot in gnu radio i see the >> typical ofdm signal but on the other hand in usrp sink on the spectrum >> analyser i saw only simple sine wave peak. please have a look and let me >> know if there is something else do i need to do to generate the proper ofdm >> signal on the spectrum analyser. >> >> /home/hp/Desktop/spectrumoutput.jpeg >> http://old.nabble.com/file/p32675018/spectrumoutput.jpeg spectrumoutput.jpeg >> >> >> >> Block diagram in GNU radio >> /home/hp/Documents/finaltesting.grc >> http://old.nabble.com/file/p32675018/finaltesting.grc finaltesting.grc >> > Your flow-graph appears to be badly confused about bandwidths and > interpolations and sample rates > --an interpolation ratio on your USRP1 sink of 100e6 is almost > certainly *not* what you had in mind. > > You probably need to learn more about all of that, and get some better > notions of how the OFDM > modulator block works. At the very least you'll need to > fractionally-interpolate the baseband > up to some sample rather that *can* reasonably be further interpolated > by the USRP1 hardware. > > Given how simple this graph currently is, I'd *strongly* suggest that > you upgrade your "world" to UHD, > since your investment in the "old world" is still rather small. > > >> >> > -- > Principal Investigator > Shirleys Bay Radio Astronomy Consortium As of last night, the 'next' branch of GNU Radio (if you are using git) has the OFDM code and examples rewritten using UHD. Tom ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1
> > hi Marcus, > > I am attaching the screen shots and also block diagram of transmitter.. > right now i am just trying to look for transmission of OFDM signal via > usrp1. As i mentioned earlier in the fft scope plot in gnu radio i see the > typical ofdm signal but on the other hand in usrp sink on the spectrum > analyser i saw only simple sine wave peak. please have a look and let me > know if there is something else do i need to do to generate the proper ofdm > signal on the spectrum analyser. > > /home/hp/Desktop/spectrumoutput.jpeg > http://old.nabble.com/file/p32675018/spectrumoutput.jpeg spectrumoutput.jpeg > > > > Block diagram in GNU radio > /home/hp/Documents/finaltesting.grc > http://old.nabble.com/file/p32675018/finaltesting.grc finaltesting.grc > Your flow-graph appears to be badly confused about bandwidths and interpolations and sample rates --an interpolation ratio on your USRP1 sink of 100e6 is almost certainly *not* what you had in mind. You probably need to learn more about all of that, and get some better notions of how the OFDM modulator block works. At the very least you'll need to fractionally-interpolate the baseband up to some sample rather that *can* reasonably be further interpolated by the USRP1 hardware. Given how simple this graph currently is, I'd *strongly* suggest that you upgrade your "world" to UHD, since your investment in the "old world" is still rather small. > > -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1
hi Marcus, I am attaching the screen shots and also block diagram of transmitter.. right now i am just trying to look for transmission of OFDM signal via usrp1. As i mentioned earlier in the fft scope plot in gnu radio i see the typical ofdm signal but on the other hand in usrp sink on the spectrum analyser i saw only simple sine wave peak. please have a look and let me know if there is something else do i need to do to generate the proper ofdm signal on the spectrum analyser. /home/hp/Desktop/spectrumoutput.jpeg http://old.nabble.com/file/p32675018/spectrumoutput.jpeg spectrumoutput.jpeg Block diagram in GNU radio /home/hp/Documents/finaltesting.grc http://old.nabble.com/file/p32675018/finaltesting.grc finaltesting.grc Please have a look and suggest me how to fix this problem in order to see the proper ofdm signal on spectrum analyser as well?? Do i need and firm ware update or sumthing on FPGA on usrp1 ??? Looking forward to hear from you. Thanks for your help. Cheers. Marcus D. Leech wrote: > > On 10/16/2011 05:55 PM, waqasme wrote: >> Hi Marcus, >> >> As i mentioned the flow graph signal blocks i have used in gnu radio >> companion from that i am getting this out put on FFT sink in GNU radio >> companion simulation flowgraph which is similar like this >> >> >> >> > If you're trying to embed images, it's not working, and the de-embedded > ones on the bottom show only >the spectrum of something typical of OFDM, and a spectrum-analyser > output that looks like it was >set up to sweep from 10Hz to 5GHz (is that what you had in mind?), > which would produce only a sharp >peak in the middle. > > We still don't know what your flow-graph(s) look like. > > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://old.nabble.com/OFDM-Transmiter-and-receiver-by-using-USRP1-tp32662445p32675018.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] OFDM Transmiter and receiver by using USRP1
On 10/16/2011 05:55 PM, waqasme wrote: Hi Marcus, As i mentioned the flow graph signal blocks i have used in gnu radio companion from that i am getting this out put on FFT sink in GNU radio companion simulation flowgraph which is similar like this If you're trying to embed images, it's not working, and the de-embedded ones on the bottom show only the spectrum of something typical of OFDM, and a spectrum-analyser output that looks like it was set up to sweep from 10Hz to 5GHz (is that what you had in mind?), which would produce only a sharp peak in the middle. We still don't know what your flow-graph(s) look like. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1
Hi Marcus, As i mentioned the flow graph signal blocks i have used in gnu radio companion from that i am getting this out put on FFT sink in GNU radio companion simulation flowgraph which is similar like this and i have used RF cable to connect from USRP1 TX board to the spectrum analyser RF out put and i am getting the output like this In spectrum analyser iam getting noise and only 1 peak in the middle which does not look like ofdm signal. I insert both the images above so you can have a look and please let me know what could be the problem. I have used 2.4GHz frequency and i am using USRP1 board . i hope the above too diagrams help you to understand my problem. Thanks and Regards, Marcus D. Leech wrote: > > On 10/16/2011 12:29 PM, waqasme wrote: >> Hello all, >> I am trying to transmitt and recieve OFDM signal Via USRP1 board. I made >> basic simulation in GNU radio a signal source block and then interleave >> and >> then OFDM modulator and then channel model block then usrp1 sink and fft >> sink to see the output..In FFT sink at the end it shows proper square >> like >> OFDM signal but on the other hand in spectrum analyser it shows only one >> peak sine wav signal not OFDM. I tried to play with the setiings but >> couldnot get the desired ofdm signal output. This is just tranmitter >> setup >> and i attched with spectrum anlyzer but i dinot get OFDM signal . iam >> only >> getting simple sine wave in the spectrum analyser. I tried with simple >> random sourse block and then DQPSK modulator and Usrp sink then it worked >> it >> shows sine wave signal in out put at spectrum analyser.Please any body >> know >> how to fix this problem or any solution ??? For reciever part i will use >> the >> same block in reverse order with ofdm demodulator.. All suggestions are >> appriciated. >> Looking forward to it... >> >> Thanks in advance.. >> waq. > More specificity is usually required to allow people to help you. > Posting your (GRC-produced) flow-graph would help. > > From your description it's hard for anyone to help you. > > > > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > http://old.nabble.com/file/p32663266/fft%2Bofdm_spectrum.jpg http://old.nabble.com/file/p32663266/fft%2Bofdm_spectrum.jpg http://old.nabble.com/file/p32663266/fft%2Bofdm_spectrum.jpg fft+ofdm_spectrum.jpg http://old.nabble.com/file/p32663266/ofdm_spec.gif -- View this message in context: http://old.nabble.com/OFDM-Transmiter-and-receiver-by-using-USRP1-tp32662445p32663266.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] OFDM Transmiter and receiver by using USRP1
On 10/16/2011 12:29 PM, waqasme wrote: Hello all, I am trying to transmitt and recieve OFDM signal Via USRP1 board. I made basic simulation in GNU radio a signal source block and then interleave and then OFDM modulator and then channel model block then usrp1 sink and fft sink to see the output..In FFT sink at the end it shows proper square like OFDM signal but on the other hand in spectrum analyser it shows only one peak sine wav signal not OFDM. I tried to play with the setiings but couldnot get the desired ofdm signal output. This is just tranmitter setup and i attched with spectrum anlyzer but i dinot get OFDM signal . iam only getting simple sine wave in the spectrum analyser. I tried with simple random sourse block and then DQPSK modulator and Usrp sink then it worked it shows sine wave signal in out put at spectrum analyser.Please any body know how to fix this problem or any solution ??? For reciever part i will use the same block in reverse order with ofdm demodulator.. All suggestions are appriciated. Looking forward to it... Thanks in advance.. waq. More specificity is usually required to allow people to help you. Posting your (GRC-produced) flow-graph would help. From your description it's hard for anyone to help you. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] OFDM Transmiter and receiver by using USRP1
Hello all, I am trying to transmitt and recieve OFDM signal Via USRP1 board. I made basic simulation in GNU radio a signal source block and then interleave and then OFDM modulator and then channel model block then usrp1 sink and fft sink to see the output..In FFT sink at the end it shows proper square like OFDM signal but on the other hand in spectrum analyser it shows only one peak sine wav signal not OFDM. I tried to play with the setiings but couldnot get the desired ofdm signal output. This is just tranmitter setup and i attched with spectrum anlyzer but i dinot get OFDM signal . iam only getting simple sine wave in the spectrum analyser. I tried with simple random sourse block and then DQPSK modulator and Usrp sink then it worked it shows sine wave signal in out put at spectrum analyser.Please any body know how to fix this problem or any solution ??? For reciever part i will use the same block in reverse order with ofdm demodulator.. All suggestions are appriciated. Looking forward to it... Thanks in advance.. waq. -- View this message in context: http://old.nabble.com/OFDM-Transmiter-and-receiver-by-using-USRP1-tp32662445p32662445.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
