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Re: [Discuss-gnuradio] Modifying code rate
From: |
Martin Braun |
Subject: |
Re: [Discuss-gnuradio] Modifying code rate |
Date: |
Tue, 8 Mar 2016 10:15:49 -0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 |
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.
>> >
>> >
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