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Re: [Discuss-gnuradio] reconstructing original data from GMSK loopback?
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] reconstructing original data from GMSK loopback? |
Date: |
Fri, 2 Nov 2007 23:31:45 -0700 |
User-agent: |
Mutt/1.5.9i |
On Sat, Nov 03, 2007 at 01:28:09AM -0400, George Nychis wrote:
> Hey all,
>
> Is the proper way to reconstruct the original data back from modulating
> and demodulating with GMSK (in loopback fashion) by packing the
> outputted bits using gr.unpacked_to_packed_bb()? Since there is 1 bit
> per byte (LSB), I'm assuming it needs packing. Whenever I add the
> following block in the flowgraph:
> gr.unpacked_to_packed_bb(self.bits_per_symbol(),gr.GR_MSB_FIRST)
>
> ... where bits_per_symbol() returns 1, I don't quite get back the
> original data before modulation. Some of the bytes are correct, but
> most seem like garbage. What's my misunderstanding?
>
> Thanks!
> George
George, I suggest that you start by understanding the existing
benchmark_tx/benchmark_rx and/or benchmark_loopback code.
They handle all of these details. These scripts can be found in
gnuradio-examples/python/digital.
Eric