If it's done using -1 and +1, how are the numbers in the files converted to 1's and 0's. NRZ encoding converts binary 1's to a + voltage and 0's to a - voltage. For example, how would a "5" or even a "Z" in the .dat file be converted to binary 1's and 0's.
Thanks all Dumezie From: Murtuza [mailto:[EMAIL PROTECTED] Sent: Tuesday, September 09, 2008 4:13 AM To: Dumezie Maduike Cc: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Modulation Schemes Regarding your other question I think the following line in GMSK.py does the work. # Turn it into NRZ data. self.nrz = gr.bytes_to_syms() Each byte is converted to a symbol of -1 or +1. I do not know any more detail. Correct me if I am wrong. Thanks Ali On Tue, Sep 9, 2008 at 3:56 AM, Murtuza <[EMAIL PROTECTED]> wrote: Look into the directory /usr/local/lib/python2.x/site-packages/gnuradio/blks2impl/ . It has many modulation schemes already implemented in Gnuradio. GMSK is infact the default scheme but one can choose various other provided in this directory. Bye Ali On Mon, Sep 8, 2008 at 11:34 PM, Dumezie Maduike <[EMAIL PROTECTED]> wrote: Hello all, I'm new to GNU Radio and was wondering what kind of modulation schemes were available. I know that GMSK is the default scheme for the "..digital/benchmark_tx.py" file. I saw that the schemes are derived from the "modulation_utils" file. I'm not sure the available options though. Also, when the benchmark_tx.py script transmits from a file, how does the data in the file get transmitted. For example if file.dat is transmitted with contents "5123645AY...", are these converted to binary 1's and 0's using ASCII or Hex conversion and then modulated and transmitted? Any help will be greatly appreciated. Thanks all. Dumezietho _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- Mir Murtuza Ali Graduate Student Center for Wireless Communications University of Mississippi University, MS 38677 Ph : (M) 662-202-5472 , (R) 662-513-9903 -- Mir Murtuza Ali Graduate Student Center for Wireless Communications University of Mississippi University, MS 38677 Ph : (M) 662-202-5472 , (R) 662-513-9903
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