Re: [Discuss-gnuradio] Symbol to chip Mapping

Not quite:

You set the "dimension" of the c2s block to 32.

No need to set any variable to 16...

Then you have to input to the c2s block an array of size 16 by 32 (or simply 16x32=512).

Take a look at some examples of how c2s block is used in gr-trellis.

Achilleas

On Mon, Mar 11, 2019 at 11:58 PM Tellrell White <rell320@gmail.com> wrote:

Okay. Let me make sure i'm clear on this.

My flow graph looks like the following :

Random source -> packed to unpacked -> chunks to symbols

The source and packed to unpacked are set to byte and the packed to unpacked is outputting 4 bits per chunks so am I setting the dimension of the "chunks to symbols" block to 16 (0-15) and inputting 1024 values, 0's and 1's, (32 values for each dimension) to complete the mapping?

Thanks for the assistance.

Tellrell

Sent from my iPhone

> On Mar 11, 2019, at 8:28 AM, Achilleas Anastasopoulos <anastas@umich.edu> wrote:
>
> Yes this can be done with chunks-to-symbols.
> This is essentially a 16 x 32 lookup table:
>
> turn your 4 bits into a byte which indices a lookup table with 32 dimensions
> (set the "dimension" variable to 32 in chunks-to-symbols).
>
> Achilleas