Re: [Discuss-gnuradio] OFDM Packets and Frames into Tagged Stream Block?

[Martin Braun]

A quick hack would be to throw down a block that renames certain tags.
You'd have to write that block, but it would consist of a memcpy() for
the data and a conditional tag copying.

M

On 04/25/2016 10:20 PM, Jingyi Sun wrote:
> Hello experts,
> 
> I have a question regarding using both OFDM packets and frames as inputs
> into the same tagged stream blocks.
> 
> In particular, I would like to input data from inside an OFDM
> transmitter and data from inside an OFDM receiver into the same tagged
> stream block. I would like to process the data while they are symbols
> before the IFFT in the transmitter, and after the FFT in the receiver,
> as shown in the attached flow graph. When we run the flow graph with
> this additional block, data transmission stops due to a run-time error. 
> 
> We believe that the problem is because we are trying to input tagged
> streams with different length tag keys: the tagged stream from the OFDM
> transmitter has length_tag_key = packet_len, while the tagged stream
> from the OFDM receiver has length_tag_key = frame_len. When we use
> inputs of the same length_tag_key, we find that there is no run time error. 
> 
> My question: is there someway that we can process the receiver data and
> the transmitter data in the same block? For example, can I "break down"
> the frames into packets so that we can avoid the mismatching
> length_tag_key error? 
> 
> Thanks a bunch!
> Jenny & Team
> 
> 
> ​