Hi Adhitha,

If you check out the tx_stage6.grc example in the folder
/src/gnuradio/gr-digital/example/packet/, you can see a Protocol Formatter.
It generates a header which contains a preamble and some additional
information, and pumps it out through the header output port.  The other
output port, called payload, outputs the original information from the
signal source. And there is another module called Tagged Stream Mux. It
combines the header and the payload, producing a packet.

As for the receiver, check out the packet_rx.grc. The Correlation
Estimation correlates the received signal with the modulated preamble and
finds out the beginning of each packet. The Header/Payload Demux splits the
header from the payload.

Hope this answers your question.


Adhitha Dias <adhithadia...@gmail.com>于2017年8月9日周三 上午5:34写道:

> Hi Edwin,
> I tried the examples but there is no information on how to detect the
> preamble. What I need to do is, once the Short Training Field is identified
> record the packet so that I can use the Long Training Field can be used for
> processing.
> I've been looking in to the examples for a couple of days but I still
> don't have an idea on how the preamble is inserted and how to detect the
> Short Training Field in order to record the un-modulated, raw, time domain
> received signal.
> I really appreciate if you can kindly provide some information on this.
> Thanks a lot!
> Regards,
> Adhitha Dias
> On 9 Aug 2017 00:12, "李博远" <lbyhp...@gmail.com> wrote:
>> Hi Adhitha,
>> Just check out the examples in the folder
>> /src/gnuradio/gr-digital/examples/packet/
>> Regards,
>> Edwin
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