Hi Ralf,
Good news!
Regarding your question, In order to be sure that what the block was
measuring was right, I've used a complete software transceiver together
with a Channel Model block. You may take a look at
https://github.com/git-artes/gr-isdbt/blob/master/examples/full_transceiver.grc.
This
Hello Federico,
after a lot of thinking I have finally managed to adapt your OFDM
Synchronization and TMCC Decoder blocks for DVB-T :-) The problem was
that the frame and symbol indexes in the tags sent by the TPS decoder
were not correct.
Although I can see the video now, I am not sure that I h
Hello Federico,
I have a lot of difficulties to generate the output and the tags for the
blocks that follow my TPS Decoder in the flowgraph. That's why I had the
idea to take a different approach.
The OFDM Synchronization block outputs the payload carriers (1705 in 2K
mode) whereas the Demod Ref
Hi Vasil,
thanks for the information. I am using Linux Mint 20.2 Uma and GNU Radio
3.8.3.1. I don't know yet how to install the debug symbols but perhaps
this is not necessary.
As I have found out, the downstream blocks expect tags that I don't send
and that is the reason why my flowgraph fails
Hi Ralf,
> Thread 27 "dvbt_symbol_inn" received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 0x7fffc5ffb700 (LWP 1924)]
> 0x7fffe61a2e0d in ?? () from
> /lib/x86_64-linux-gnu/libgnuradio-dtv.so.3.8.3
> (gdb) bt
> #0 0x7fffe61a2e0d in () at
> /lib/x86_64-linux-gnu/libgnura
Hi Federico,
indeed, the "symbol_index" tag that is normally sent for each OFDM
symbol is missing. This might cause an unexpected situation for the
following deinterleaver block, "Access not within mapped region"
according to valgrind.
I will see how I can generate the symbol index for each symb
Hi,
I'd be more than happy to help. A couple of things that come into my mind.
The OFDM Synchronization block is a combination of our "old" OFDM Symbol
acquisition (for a while now it's been part of GNU Radio) and Sync and
Channel estimation blocks (which performed equalization and integer
freque
Hi Ralf,
On 10/12/2021 11.52, Ralf Gorholt wrote:
> Unfortunately, when I deactivate the original flowgraph, it does no
> longer work and I get a -11 return code.
The "-11" value means that you got a segmentation fault and the process was
kill with signal 11 (SIGSEGV)
https://docs.python.org/3
Dear all,
I forgot to mention in me previous mail that the test flowgraph is not
generated by GRC when it terminates with a -11 return code. I have just
noticed that the test.py file is missing.
My GNU Radio version is 3.8.3.1.
Ralf
Dear all,
in order to benefit from Federicos ISDB-T block "OFDM Synchronization"
that performs a frequency and symbol rate correction I am currently
trying to adapt his blocks "OFDM Synchronization" and "TMCC Decoder" in
a way that makes them usable for DVB-T. To check if they work correctly
I ha
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