Re: Why the ofdm data packet is not fully received ?

[Marcus Müller]

Hi!

A single OFDM symbol has 64 carriers. I can only guess you're using the 
configuration of OFDM Carrier Aggregator that gives you 48 carriers 
dedicated to data.
On each of these carriers, you do QPSK, so 2 bit per symbol.
That makes for a total of 96 bits, in a single OFDM symbol.

96 bits are 12 Bytes. "hello world" has 11 Bytes. So, you're not even 
filling a single OFDM symbol with data!

But you're even setting a frame length of 96 bytes. So, this can't work; 
you need to give the transmitter enough data to fill a frame.

Best regards,
Marcus



On 28/10/2021 10.59, 能书能言 wrote:
> Hello everyone,
> I am using ofdm_tx/rx.grc to transfer text file data, and there is a 
> "hello world" character in the text. I use two usrpb210 for transmission 
> .When I set the "repeat" in the "file sink" to no, the receiving end 
> cannot receive the correct "hello world" word, and the open file is 
> blank; but when I set the "repeat" to yes, the receiving file is opened 
> , Which contains a lot of repeated "hello world" words, I want to know 
> why this happens? How can I solve this problem? (It can still be 
> received correctly when my "repeat" is set to no)
> The flowchart is in the attachment.
> Thanks to anyone for the relevant information, thank you!
> Sincerely

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