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Re: [gaia] Video about community network using HF band

Rafael Diniz <rafael@riseup.net> Wed, 18 March 2020 14:31 UTC

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From: Rafael Diniz <rafael@riseup.net>
To: =?UTF-8?Q?Javier_Sim=c3=b3?= <javier.simo@urjc.es>, gaia@irtf.org
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Date: Wed, 18 Mar 2020 11:31:47 -0300
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Subject: Re: [gaia] Video about community network using HF band
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please read "Shannon channel capacity" where I wrote "Nyquist limit".

On 3/18/20 11:27 AM, Rafael Diniz wrote:
> Hi Javier, but newQPSK in soundmodem, if my memory does not fail, is way
> wide wide than what we are using in HF, 2kHz. We are using OFDM, I'd say
> we are closer to Nyquist limit, but of course there is plenty of room
> for optimization in the MAC and upper protocol layers.
> 
> Rafael
> 
> On 3/18/20 6:41 AM, Javier Simó wrote:
>> 18 years ago we worked on a HF packet-radio based solution and developed
>> improvements  using OFDM newQPSK; getting up to 9600 bits/s. I don't
>> know whether I can find the expert who might resemble all the details,
>> code, etc, but if you feel it could be interesting I can explore that.
>>
>> Best
>>
>> Javier
>>
>>
>> El 18/3/20 a las 4:31, Rafael Diniz escribió:
>>> Gracias Luiz!
>>>
>>> We carried initial tests of this system in Mexico. The raw throughput,
>>> in reasonable propagation conditions, is from 500 up to 4k bit/s. In
>>> "real world" tropical region NVIS trx with hundreds of kilometers of
>>> distance, with packet protocol and ARQ layers in place, the net
>>> throughput ranges from 50 to 500 bit/s, depending on many factors.
>>>
>>> Abrazo,
>>> Rafael
>>>
>>>
>>> On 3/17/20 6:23 PM, Luis Martinez wrote:
>>>> Parabens Rafael ! 
>>>> It is wonderful, we are discussing a project like that in Mexico. Can
>>>> you share what is the speed you are able to achieve ?
>>>> Obrigado.
>>>> Luiz
>>>>
>>>>
>>>> On March 17, 2020 at 1:37:42 PM, Rafael Diniz (rafael@riseup.net
>>>> <mailto:rafael@riseup.net>) wrote:
>>>>
>>>>> Hi all,
>>>>>
>>>>> Here is the link of our latest developments about HERMES[1]:
>>>>> https://vimeo.com/398331581
>>>>>
>>>>> Cheers,
>>>>> Rafael Diniz
>>>>> Rhizomatica
>>>>>
>>>>> [1] https://www.rhizomatica.org/hermes/
>>>>>
>>>>> _______________________________________________
>>>>> gaia mailing list
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>>>
>>> _______________________________________________
>>> gaia mailing list
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>> -- 
>>
>>
>> *Francisco Javier Simó Reigadas*
>>
>> *Profesor, Director de la ETSIT*
>>
>> *Dep**t. Teoría de la Señal y Comunic. y Sist. Telemáticos y Computación*
>>
>> Universidad Rey Juan Carlos
>>
>> Campus de Fuenlabrada(Madrid), España
>>
>> Teléfono: 91 4888167
>>
>> javier.simo@urjc.es <mailto:javier.simo@urjc.es>| www.urjc.es
>> <http://www.urjc.es>| @URJC |
>>
>>
>>
>>
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> 
> 
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