Hi Damindra,
In the OFDM Transmitter block, check the parameter Length Tag Name. Value of
that parameter should be same as Length Tag Key parameter in Stream to Tagged
Stream block.
See gr-digital/examples/ofdm/tx_ofdm.grc for an example.
Regards,Kartik Patel
On Sat, Dec 24, 2016 4:19 AM, Damindra Bandara [email protected]
wrote:
Hi,
I am trying to dynamically reconfigure some parameters of a flow graph. My flow
graph is as follows.
File source --> stream to tagged stream --> OFDM transmitter --> usrp sink
In the top_block I do the following.
tb.stop()
tb.wait()
<do the reconfiguration>
tb.start()
I have done parameter reconfiguration earlier(before introducing OFDM TX) and it
worked fine. However now when I try to do the reconfiguration I get the
following error.
FATAL: Missing a required length tag on port 0 at item #160
thread[thread-per-block[2]: <block crc32_bb (16)>]: Missing length tag.
FATAL: Missing a required length tag on port 0 at item #160
thread[thread-per-block[18]: <block crc32_bb (27)>]: Missing length tag.
SSFATAL: Missing a required length tag on port 0 at item #0
FATAL: Missing a required length tag on port 0 at item #0
thread[thread-per-block[86]: <block ofdm_frame_equalizer_vcvc (62)>]: Missing
length tag.
thread[thread-per-block[53]: <block ofdm_frame_equalizer_vcvc (93)>]: Missing
length tag.
LLLLLLLLUU
I appreciate if someone could help me to figure out what is causing this issue
and how to fix it.
Thank you,
Damindra
--
Damindra Savithri Bandara,Ph.D. in Information Technology (Candidate)
George Mason University,
Fairfax,
Virginia
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