Thanks Martin & Johannes . I send & receive real time voice packets coming from soft phone using 2 USRPs over GSM RF channel: If there is a call established between the 2 end users but they are not speaking , then no new packets to send ? If there is no new packets coming , I want to send zeros instead of repeating the sent packets , How Can I do this ?
Thanks in advance. 2014-05-22 17:03 GMT+03:00 Martin Braun <[email protected]>: > On 05/22/2014 11:29 AM, Sara Chérif wrote: > > In ofdm transmitter , I want to add 6 subcarriers as a guard band > > between symbols , so that each symbol is fft + cp + guard band .. How to > > add this guard band ? is there a block which add zeros ? > > I think I can make guard band included in CP , I can make cp longer by 6 > > then multiplying symbols by a window (multipling fft and actual cp by > > ones & multipling last 6 subcarriers by zeros ) . Is there a window or > > time domain filter in GNU Radio ? > > See http://gnuradio.org/doc/doxygen/page_ofdm.html, you can simply use > those subcarriers you want. The default settings (see e.g. the OFDM > examples) all have empty sub-carriers for this reason. > > M > > > Thanks. > > > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > [email protected] > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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