Hi Shriharsha, As Zakaria already pointed out, since real channels are imperfect, packet losses *must* occur. The demod will need some samples to lock on to your rx signal, so losses at start are to be expected.
I can only point you to some reference: there is a GNU Radio Companion file in gnuradio/gr-digital/examples/demod/ called dpsk_loopback.grc . That should work. You can insert a channel model in between mod and demod, and see what happens. Increase channel influences (noise power, etc.) until they match or exceed what you'd expect from your real-world channel. Later, split the flowgraph in halves and connect them to your USRP sink/sources (don't forget to remove the throttle at that point). Greetings, Marcus PS: For the future, when asking a question, please try to apply the hints from http://gnuradio.org/redmine/projects/gnuradio/wiki/ReportingErrors . This will make it much easier to help you :) On 24.05.2014 18:51, zielalaoui wrote: > hello SHRIHARSHA, > If your simulation looks good, try and see what's different about the > incoming signal on air as opposed to the simulation. Is the frequency offset > maybe too large? Is the received amplitude correct? Try mapping these into > your simulation and see where things start to fall apart. At this point, you > seem to have the basic setup correct and just need to continue to experiment > with the settings. > The packet decoder will work pefectly if the input signal of the demodulator > is good enough. The sample rate is also an issue, you should find the best > value for your application. > Zakaria > > > > > -- > View this message in context: > http://gnuradio.4.n7.nabble.com/no-subject-tp48478p48479.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 _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
