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:address@hidden
Sent: Tuesday, September 09, 2008 4:13 AM
To: Dumezie Maduike
Cc: address@hidden
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 <address@hidden> 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 <address@hidden>
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
--
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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