> > 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
