Re: [Discuss-gnuradio] guard band

[Sara Chérif]

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 <address@hidden>:

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.

>
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