Re: [Discuss-gnuradio] Help using simple_framer and simple_correlator

[address@hidden]

I am also in the process of studying this part of the software to see if I
can use it to recreate my data from the demodulated signal.

Can anyone provide information on what are sync field, seq number and
command field that are added to the payload?  I need to recreate this in my
transmitter which is not usrp/gnuradio based.  It's just a simple micro
controller.  So far I have not been able to understand what the
gr_simple_framer does.

Does the framer convert digital data stream to self-synchronizing code?

My transmitter clock rate is not a multiple of 64 MS/s and therefore so is
my data rate.  Will this cause difficulty?  I am using very low data rate
and with short retransmission time.

Mike, if you get your code to work, I would like to see it and what does
the input data file look like.

Thanks,
Mike

Original Message:
-----------------
From: Eric Blossom address@hidden
Date: Thu, 17 Nov 2005 10:53:38 -0800
To: address@hidden, address@hidden
Subject: Re: [Discuss-gnuradio] Help using simple_framer and
simple_correlator


On Wed, Nov 16, 2005 at 11:22:28AM -0500, address@hidden wrote:
> In order to gain a better understanding of how the simple_framer and the
> simple_correlator work, I am trying to implement the following code. 
However,
> when I run the program, I don't get any output.  I'm not sure what I'm
doing
> incorrectly.  Once I determine my error, I am also interested on how to
use
> lfsr_32k_source_s (to replace the file_source) and check_lfsr_32k to
determine
> error rates in this simple program.  Any help would be appreciated.
> 
> Thank you,
> Mike

Hi Mike,

Not sure if you've still got this question, but the problem is that
the output of sample_framer + bytes_to_syms can't be directly
connected to simple_correlator.  The simple correlator exepects its
input to be oversampled 8x times.  Just wiring them together as you
have doesn't honor that requirement.

Eric


_______________________________________________
Discuss-gnuradio mailing list
address@hidden
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

--------------------------------------------------------------------
mail2web - Check your email from the web at
http://mail2web.com/ .