I try different "random" access code and preamble but the output still 0kB. Would you mind to give an example or reference about it?
On Sun, May 24, 2015 at 2:09 AM, Surya Agam <[email protected]> wrote: > Would you mind to give an example or reference about it? > I try random bit but I still have nothing. > > Surya > > On Sat, May 23, 2015 at 2:57 PM, Laur Joost <[email protected]> wrote: > >> I'm away from my computer right now, so I can't verify anything. But >> here's what I remeber from getting it to work. >> >> For testing whether it works, just set them to a bunch of 1-s and 0-s. >> Preamble is used by the demodulator for carrier and symbol timing >> recovery, so it should have many transitions and be long enough to give the >> recovery loops time to lock (I think I tried 32 bits and it worked). >> Access code is used to detect the start of packet after the preamble, so >> it should have low autocorrelation, i.e. it should be as different as >> possible from shifted versions of itself (Meaning, don't set it to >> 10101010. It could work when simulating perfect signals, but it's a Bad >> Idea). >> >> There are criteria and methods for selecting good ones for both, check >> the relevant Wikipedia articles for relevant articles :D >> >> All the best >> Laur >> 23.05.2015 9:49 kirjutas kuupäeval "Surya Agam" <[email protected] >> >: >> >>> I leave it blank. My setting for Encoder is >>> Sample/Symbol = 2 >>> Bit/Symbol = 1 (based on documentation for BPSK) >>> preamble = blank >>> access code = blank >>> USRP pad = no >>> Payload Strength = 0 >>> >>> My Decoder >>> Access code = blank >>> Threshold = -1 >>> >>> How to set the preamble and access code? >>> >>> Surya >>> >>> On Sat, May 23, 2015 at 11:37 AM, Laur Joost <[email protected]> wrote: >>> >>>> Have you set the preamble and access code? The "leave blank for >>>> automatic" didn't work for me. >>>> >>>> Laur >>>> 23.05.2015 6:53 kirjutas kuupäeval "Surya Agam" < >>>> [email protected]>: >>>> >>>>> Hello everyone, >>>>> >>>>> I want to simulate file transmission using BPSK modulation, with block >>>>> diagram >>>>> >>>>> >>>>> File Source --> Packet Encoder --> BPSK Mod --> BPSK Demod --> Packet >>>>> Decoder --> File Sink >>>>> >>>>> >>>>> But the result is 0 kB. Then I remove the Encoder-Decoder and >>>>> Modulation block. >>>>> >>>>> File Source --> File Sink >>>>> >>>>> Then I have the file and it's operable (-5 bytes from original file) >>>>> >>>>> Next step I add Packet Encoder - Decoder >>>>> >>>>> File Source --> Packet Encoder --> Packet Decoder --> File Sink >>>>> >>>>> But the file size is 0 kB >>>>> >>>>> I don't know what is wrong with the Encoder-Decoder. >>>>> >>>>> >>>>> Thank you >>>>> >>>>> >>>>> Regards, Surya Agam >>>>> >>>>> _______________________________________________ >>>>> Discuss-gnuradio mailing list >>>>> [email protected] >>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>> >>>>> >>> > -- Sincerely, Surya Agam University Al Azhar of Indonesia, Jakarta
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