Re: [Discuss-gnuradio] Modifying code rate

[Martin Braun]

Yeah, I think benchmark_rate doesn't even use FEC.

Cheers,
Martin

On 03/07/2016 11:14 PM, Marcus Müller wrote:
> 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
>> <mailto: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.
>>     >
>>     >
>>     > _______________________________________________
>>     > Discuss-gnuradio mailing list
>>     > address@hidden <mailto:address@hidden>
>>     > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>     >
>>
>>
>>     _______________________________________________
>>     Discuss-gnuradio mailing list
>>     address@hidden <mailto:address@hidden>
>>     https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>
>>
>>
>>
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> address@hidden
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
> 
> 
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>