Re: [Discuss-gnuradio] OFDM frame equalizer length tag

Unfortunately, what you say is what I did. I attach some screenshots.. I don't know the reason why in Pseudo-Random Generator block appears "frame len" without "_" and the strange thing is that Pseudo-Random Generator didn't have this problem with other block, such as serializer_subcarriers. I'm trying to understand.

Hi Alice - If I had to guess, it would be that the tag for the frame_equalizer_alix block is "frame_len", while that for the Pseudo-Random Generator is "frame len" ... without the "_" joining the words. Or, that's what it looks like in the image. The tagged_stream_block is picky about these names; they really have to be identical!

A word of advice: Assign a variable that holds this string value, and set all of the blocks that use it to the variable. Make the variable name and it's value something other than "frame_len" alone ... for example, "frame_len_alix" or the like ... a name that will be clear in debugging that it is either there and correct or not (and thus incorrect).

Hope this helps! - MLD

On Wed, Dec 6, 2017, at 05:54 PM, Alice Lo Valvo wrote:

Hi,

I duplicated the OFDM Frame Equalizer block, and all it works, I added a second input port which is connect with another block that is a tagged_stream block. I don't understand the reason of this error:

gr::log :FATAL: frame_equalizer_alix0 - Missing a required length tag on port 1 at item #0

thread[thread-per-block[49]: <block frame_equalizer_alix (17)>]: Missing length tag.

Length tag is there.. any ideas?

Thanks in advance.

Alice

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From:	Alice Lo Valvo
Subject:	Re: [Discuss-gnuradio] OFDM frame equalizer length tag
Date:	Thu, 7 Dec 2017 10:50:54 +0100
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