Song,
Every transmitted pkt has structure
preamble:access_code:header:payload_with_crc:'\x55'
header consists of 2 16-bit shorts, having payload length and whitener
offset.
On receiver side "framer sink" extracts the payload depending upon the
value of header (2 shorts).
see "packet_utils.py" and doxygen doc of "gr_framer_sink"
-Adeel
On Thu, Dec 8, 2011 at 12:07 PM, Songsong Gee <[email protected]>wrote:
> When I run benchmark_tx.py, the packet size has to be specified (default
> is 1500)
> However, I could see nothing defining the packet size on benchmark_rx.py
>
> In benchmark_rx.py, messages from benchmark_tx.py are queued after passing
> demodulator, correlator, and framer sink.
> But, I'm wondering that how can the receiver queue a message which has the
> exact size defined by the transmitter without defining the packet size on
> the receiver.
>
> Are there any steps or procedures inside the demodulator, correlator, or
> framer sink that recognize the start and the end of the packet?
>
> --
> Seokseong Jeon, PhD Candidate
> Communication & Networks Lab
> IT Convergence Engineering (ITCE), POSTECH, Korea
> +82 10 8338 1229, gee.songsong at gmail . com
>
>
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