Hi GP, ofdm_loopback.grc covers only the physical aspects of the transmission. What you are describing is a flow control problem; you'd need to figure out yourself how to make your data stream fit into the packets. A typical way would be to send the length of your file, and then just fill up the last packet with random data/redundancy/zeros; however, what will happen if you lose one packet?
In a real-world application, you'll have some content header, you'd have channel coding/FEC, possibly some ARQ scheme, in case of multiple users a MAC etc; whereas you "only" stream bits out of a file. Complete, versatile transmission systems is what people build atop of transmission systems such as the GNU Radio-supplied OFDM packet transmitters (which primarily serve as good examples and showcases for the mechanisms involved). Hope that was a little helpful, Greetings, Marcus On 03.07.2014 00:01, GP 2014 wrote: > When I ran the example ofdm_loopback.grc, > i used a file source to send data through the transmitter and checked the > output after the receiver in a file sink ; > i found that if the packet required to be sent is less than the defined > packet_length ; then the packet is not sent ? > how to send the last packet in this case ? > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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