On Fri, Oct 12, 2012 at 5:43 PM, sibar002 <sibar...@ucr.edu> wrote: > Hello, > > I am working on creating a OOK Modulation block. I have created a block > using the bpsk.py file as an example. I changed the constellation points > such that 1+0j and 0+0j. I am now trying to change the waveform that is > outputted from the USRP. I would like to transmit a square wave for 1 and > nothing for 0. I am not sure how I can do these. I would greatly appreciate > any help or advise that any one could give me. Thank you for your time and > help.
What are you seeing when you change the bpsk.py file for your new constellation? That should be close. The bpsk modulator uses a root raised cosine pulse shaping filter, is that what your problem is? If you really want to transmit a square wave (but remember, doing that is going to throw a lot of signal into the spectrum; also your transmitter, receiver, and channel are all going to filter this signal in their own way to distort it), you can change this to a LPF filter with a wide enough passband to pass the square wave. The filter also interpolates the signal, which you'll want to do, too. Tom _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
