Thank you Tom, I found a note in documentation of the *Packet Encoder *block where it declares that the *Packet Encoder* is for use with the gnuradio modulator blocks: GMSK, DPSK, QAM. I don't know why only these modulator blocks are supported, but not some popular things like BPSK or QPSK. Another thing is that my task requires the use of OFDM.
Suppose now I have a simple flow graph as below: File Source -------> Packet Encoder -------> Packet Decoder ---------> File Sink I wonder what types of file can be loaded and processed properly in the *File Source* block (text, image, or video ...), and the same question for the *File Sink* block :-) Thank you so much Van-Ly Van-Ly Nguyen, Signals and Systems of Laboratory - SSL Faculty of Electronics and Telecommunications - FET University of Engineering and Technology - UET Vietnam National University, Hanoi - VNU Tel: (+84) 978 819 406 On Wed, Jul 30, 2014 at 8:24 PM, Tom Rondeau <t...@trondeau.com> wrote: > On Wed, Jul 30, 2014 at 4:44 AM, Nguyễn Văn Lý <lynguyenvan....@gmail.com> > wrote: > >> Hi all, >> >> Can anyone tell me what do *Packet Encoder* and *Packet Decoder* blocks >> do? and it would be great if you can give me some example :-) >> Thanks in advance >> >> Van-Ly >> > > These are very simple example blocks to show you how to packetize data. > Packet bytes go in, they get wrapped into a packet of a given payload > length with a header, access code, and preamble. The header is just a 2x > repetition of the payload length (16 bits for each field). Leaving the > preamble and access code blank just chooses the defaults. > > The decoder just looks for the access code with the number of available > bits wrong. When it's found, it reads the header to get the payload length, > extracts the payload, and outputs the payload. > > Hope this helps. > > Tom > >
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