Re: [Discuss-gnuradio] OFDM receiver error, FATAL: Missing a required length tag on port 0 at item #0

Hi, thank you for your response.

In fact, I still have the same error:

 FATAL: Missing a required length tag on port 0 at item #0
 thread[thread-per-block[21]: <gr_block crc 32_bb (9)>]: Missing length
tag.

and UOOOOOOOOOOOOOO

I put the usrp sink and usrp source 's sample rate to 1M.

What is the suitable sampling rate to put ?

Thanks in advance

2014-06-30 16:36 GMT+02:00 Philip Balister <philip@balister.org>:

On 06/30/2014 09:20 AM, Wafa Elhajhmida wrote:
> Hi,
>
> I implemented OFDM receiver on USRP E110 using the OFDM receiver in
> examples in gnuradio's files 3.7
>
> and I added to it a chain to create OFDM transmitter: random source, OFDM
> transmitter, channel model,  throttle, USRP sink
>
> But when I executed the flow graph. It generated "UOOOOOOOOOOOOOOOOOO" and
> I got an error :

Slow the data rate until this message stops. Then worry about the next
message.

Philip

>
> FATAL: Missing a required length tag on port 0 at item #0
>  thread[thread-per-block[21]: <gr_block crc 32_bb (9)>]: Missing length
> tag.
>
> and tag debug didn't show anything.
>
> Have you an idea how to fix this error ?
>
> Thanks in advance
>
>
>

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