my flow graph like below: Tx) file source (txt file) -> packet encoder (bit per symbol = 4) -> 16QAM modulation -> osmocom sink
Rx) osmocom source -> 16QAM demodulation -> packet decoder -> file sink > 2015. 12. 1., 오후 7:17, Dominic Spill <[email protected]> 작성: > > On 25 November 2015 at 05:54, 김상혁 <[email protected]> wrote: >> >> I am wondering why most of file transfer use FSK (De)Modulation scheme ? > > I'm not sure what you mean by "most file transfer", do you have a > particular device/application that you are targeting? Or are you > trying to build your own system? > >> I tried to replace GMSK to QAM or PSK scheme, however it doesn’t work. > > Could you provide us with any more informationt han this? The > flowgraphs? The way that they fail? > >> I couldn’t get any file,but when I saw Rx GUI FFT Sink, I could see signal >> is sparked at Tx started. > > Have you tried to debug this? I would start by taking out the radio > blocks and writing the samples to file, then reading it back. This > will make sure that your modulation/demodulation are working as > expected. > > After that you will need to look at the FFT (as you are already doing) > and maybe a waterfall plot to see if there is noise that affects your > signal. > > You could record the received data to file and view it with inspectrum > to see if it looks as you expect. Is there noise? Is the entire > signal present? _______________________________________________ HackRF-dev mailing list [email protected] https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
