Thanks Marcus, I am thinking to use "Random source" generating 010101......as source. If I wanna modify the transmit diagram based on http://gnuradio.org/doc/doxygen/ofdm_tx_core.pn<http://gnuradio.org/doc/doxygen/ofdm_tx_core.png> g What would you suggest? Can you show me the block diagrams for me to create the blocks before ofdm_rx_core.png, "Virtual source -> OFDM Carrier Allocator -> FFT -> OFDM Cyclic Prefixer" Am I right like creating "Random Source -> OFDM Mod -> Virtual sink" Will it conflict between "OFDM Mod" and "Cyclic Prefixer"? Or my thought is totally wrong!
Sincerely, On Wed, Sep 25, 2013 at 11:45 AM, Marcus Müller <mar...@hostalia.de> wrote: > Hi Kevin, > > no, they are not the same. > In the ofdm mod XML file (gr-digital/grc/digital_ofdm_mod.xml), the make > element is: > grc_blks2.packet_mod_$(type.fcn)(digital.ofdm_mod( > options=grc_blks2.options( > modulation="$modulation", > fft_length=$fft_length, > occupied_tones=$occupied_tones, > cp_length=$cp_length, > pad_for_usrp=$pad_for_usrp, > log=None, > verbose=None, > ), > ), > payload_length=$payload_length, > ) > > So, OFDM mod is basically a packet encoder, which internally is a message > queue based approach to managing packets. > This is nice, because internally digital.ofdm_mod has a send_pkt method > that encodes your message, enabling it to work asynchronously, it generates > a sync-friendly, preambling, data-encoding framework, > so it's a user-friendly data->symbols->preamble+symbols->ifft->cyclic > prefixer->normalizer hier block, > while ofdm_tx_core.png only shows the very basic princible of generating > OFDM signals in GNU Radio. > > Hope I was of a little assistance, > Marcus > > > Morning, > > Sorry for taking so long to reply. > > I have one question, > the block, "OFDM Mod" <-----> and these three, "OFDM Carrier > Allocator, FFT, OFDM Cyclic Prefixer", > shown on the website, http://gnuradio.org/doc/doxygen/ofdm_tx_core.png > > Are they doing the same thing? > > Thanks > > > > > > > ---------- Forwarded message ---------- > From: Martin Braun (CEL) <martin.br...@kit.edu> > Date: Fri, Sep 20, 2013 at 6:08 PM > Subject: Re: [Discuss-gnuradio] About setting the GRC block properties. > To: GNURadio Discussion List <discuss-gnuradio@gnu.org> > > > On Fri, Sep 20, 2013 at 01:45:46PM -0500, Kevin wrote: > > "Virtual source" block shows "pre-ofdm", which means I need to create > some > > blocks like "Virtual sink" labeled "pre-ofdm" before this? > > Don't worry about these blocks, they are just to make the Figures look > complete (or rather, to label the inputs). > > > "I think you just need brackets around the carrier allocation table. > > Also, use Python's range() to make stuff more readable." > > > > > > Can you explain it more specifically? > > > > bracket at which section? > > You need more (). The carrier tables are vectors of vectors ((...), ...). > > > > "python's range()" I have no idea what this is? > > Look up the range() function in Python. > > MB > > -- > Karlsruhe Institute of Technology (KIT) > Communications Engineering Lab (CEL) > > Dipl.-Ing. Martin Braun > Research Associate > > Kaiserstraße 12 > Building 05.01 > 76131 Karlsruhe > > Phone: +49 721 608-43790 > Fax: +49 721 608-46071 > www.cel.kit.edu > > KIT -- University of the State of Baden-Württemberg and > National Laboratory of the Helmholtz Association > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > > _______________________________________________ > Discuss-gnuradio mailing > listDiscuss-gnuradio@gnu.orghttps://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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