I found the paper. And it doesn't look like they are tweaking what they send. Rather they are looking at multiple copies of the same packet. And there is a special parity packet that they send (additional overhead, but there really isn't such thing as a free lunch).
I'm not sure what they are doing with the preamble. Typically one doesn't get the preamble out of the 2420. On Mon, Jun 16, 2014 at 10:28 AM, Eric Decker <cire...@gmail.com> wrote: > > I am not aware of anyway using the cc2420 h/w to get access to > manipulating the preamble. > > So I would say no it isn't possible. > > Can you send me a copy of the paper "Packet Combining in Sensor Networks" > and I'll see if I can figure out what they were doing. > > > > On Mon, Jun 16, 2014 at 7:31 AM, 俞杰 <never...@gmail.com> wrote: > >> Hello everyone, >> >> I've recently read a paper called "Packet Combining in Sensor >> Networks(SenSys'05)" which relates to error correction. >> What confuses me is the operations they did to preamble. >> In the experiment they did ,"the received preamble was also dumped >> out along with each packet". >> And in the implementation , " we embed the type of each packet(parity or >> plain) in the preamble so that it does not require additional bits." >> It seems that we can read and define the content of preamble in tinyos . >> >> But when I check the CC2420 datasheet , it says >> "the preamble and start of frame delimiter are generated by hardware"(p17 >> of 85), >> "the preamble sequence is defined to be 4 bytes of 0x00" and "the >> preamble length and SFD is configurable"(p36) >> It never says the content of preamble is configurable! >> >> So my question is : >> Is it possible to read or configure the content of preamble in CC2420 >> based radio?And if possible,how? >> >> Best regards, >> Jay >> _______________________________________________ >> Tinyos-help mailing list >> Tinyos-help@millennium.berkeley.edu >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> > > > > -- > Eric B. Decker > Senior (over 50 :-) Researcher > > -- Eric B. Decker Senior (over 50 :-) Researcher
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