Hi Sarah - Glad you're heading down a positive path. The header data is removed from the raw data being decoded, but added as meta-data on the stream. This meta-data is optionally printed out by GR OFDM and/or various Qt displays. Once the header has been verified (via CRC8), it is no longer part of the raw OFDM symbol data. Cheers! - MLD
On Wed, Mar 7, 2018, at 9:11 PM, Sarah Tran wrote: > Thank you for your quick response! I wanted the payload to be QPSK > modulated. I put a QT Range blocks in for the gain settings on the > ofdm_tx and ofdm_rx flowgraphs. I still can’t seem to get any better > than 20% BER though, but I think the advice about doing a PER > calculator is pointing me in the right direction as a lost packet > would definitely screw up the BER. So thank you very much for the > advice!!> > I did have another question though regarding the metadata that still > has me confused. If the header data is taken out of the payload, why > does it still show up when I put a time sink after the payload > gettings decoded (after the constellation decoder/stream CR32 blocks)? > It plots the decoded bits as well as the packet num, carrier_offset, > etc. Did I put my time sink in the wrong place?
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