Re: [Discuss-gnuradio] Modifying code rate

[Marcus Müller]

Ah! There's samples per symbol (which I think you're reffering to) and "code rate", which is a term from channel coding theory. Don't confuse the two!

So, the minimum samples per symbol is indeed 2 (everything below wouldn't really have a pulse shape).
If you want higher data rate, increase the sampling rate.

Your questions really indicate that it might really make sense to slightly improve your digital communications basics. I think you should really take the time to read about modulation, constellations, pulse shaping, memoryless channels, symbol error rates, bit error rates, noise, SNR, Eb/N0..., i.e. the first half of a textbook on digital communications. None of what we've discussed are really GNU Radio problems, but things you'd directly deduct from a solid understanding of the theory beneath. Getting that understanding will of course take time, but not having that understanding costs you at least that much time, too.

Best regards,
Marcus

On 03/08/2016 02:16 AM, SangHyuk Kim wrote:

Dear Martin.

In benchmark_tx.py example, I want to transmit packet by maximum bit rate.

As I know, 1/2 is default coding rate. So, I can't achieve higher speed.

So, my question :

- How can I modify coding rate (default 1/2) ?

  In other word, which source file handle coding rate ?

Thanks 

2016-03-08 6:20 GMT+09:00 Martin Braun <address@hidden>:

SangHyuk,

you'll need to provide some more detail on what you're asking, what you
want to achieve, what you're using... etc.

Cheers,
M

On 03/06/2016 05:43 PM, SangHyuk Kim wrote:
> Hi all.
>
> I want to use high code rate for high throughput
>
> But, I can't find proper block to do.
>
> Can I change code rate using GNU radio?
>
> Also, is it possible using benchmark_tx.py (one of the example file
> provided) ?
>
> Thanks.
>
>

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