I am new to linux and GNURadio. I don'g follow where the 1 bit/byte is coming
from. Does the audio source not deliver 8bit/sample or how do you figure that
out? I don't see anything such as "gnuradio>digital>generic_mod_demod.py " in
my directories. Thanks for the help.
Tom
------------------------------------------------------------------------------------------------------------------------------
Tom,
There are few changes required in ur FG
1: PSK/QAM Modulator takes packed byte input (8 bits per byte) instead of 1
bit per byte
see gnuradio>digital>generic_mod_demod.py
2: Constellation sink work only for PSK modulation M=2,4,8.
To see output constellation of QAM-16 u will have to first downsample it
to 1 sample_per_symbol and then use wx-scope-sink in XY-Mode
Down-sampling can be done using symbol-timing blocks or manually
(delay+keep1inN combination) as in attached FG
-Adeel
>________________________________
> From: Adeel Anwar <adeela...@gmail.com>
>To: tom sutherland <alphatoz...@yahoo.com>; discuss-gnuradio@gnu.org
>Sent: Friday, July 5, 2013 10:25 PM
>Subject: Re: [Discuss-gnuradio] Simple QAM project
>
>
>
>
>Can u attach ur GRC file?
>
>-Adeel
>
>
>
>
>On Fri, Jul 5, 2013 at 5:48 AM, tom sutherland <alphatoz...@yahoo.com> wrote:
>
>I am trying to get data through a QAM-16 Modulator and just display the data
>stream on a Constellation Sink. I have 8khz sampled 8-bit data(char) going
>into the QAM Mod block. I have the output of the QAMmod block going directly
>into the Const Sink. I am not seeing anything on the Constellation Sink. I put
>a throttle block in but that didn't help.
>>Any thoughts on what could be wrong? I have followed the GNUradio tutorial:
>>Part 4 by balint256 but didn't help.
>>Thanks...DT
>>
>>
>>
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>
>
>
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