>I have  training  with matalb  and  de  differences   of  the  result 
>between  a  se&ntilde;al with  error  rate(before  viterbi)  -6  and  a signal
>with  error  rate  -3(before  viterbi)  is  cero
>
>from the view  of  the instaler is  more  easy to make  a installation  
>with a ber  of  -3  than with a ber  of  -6
>
>Could  someboby  tell  me  with is  the difference  between those  two
>signals from the  point  of  view  of  the result?
>
>thank you  again and  sorry for  my  english 
>

up  :D

I have  training  with matalb  and  de  differences   of  the  result 
between  a  se&ntilde;al with  error  rate(before  viterbi)  -6  and  a signal
with  error  rate  -3(before  viterbi)  is  cero

from the view  of  the instaler is  more  easy to make  a installation  
with a ber  of  -3  than with a ber  of  -6

Could  someboby  tell  me  with is  the difference  between those  two
signals from the  point  of  view  of  the result?

thank you  again and  sorry for  my  english


Steve Pope wrote:

> Vladimir Vassilevsky  <nospam@nowhere.com> wrote:
> 
> 
>>Translate the question through Babelfish twice: in forward and in 
>>backward direction. 
> 
> 
> That's the BCJR algorithm isn't it?

It's more like TURBO decoding iteration.

VLV

Vladimir Vassilevsky  <nospam@nowhere.com> wrote:

>Translate the question through Babelfish twice: in forward and in 
>backward direction. 

That's the BCJR algorithm isn't it?

Steve

Rune Allnor wrote:

> On 27 Des, 03:23, robert bristow-johnson <r...@audioimagination.com>
> wrote:
>>On Dec 26, 7:59 pm, "owpex" <chipko...@hotmail.com> wrote:
>>
>>>Thank you  very much and sorry  for my translator-english
>>
>>i ain't never even heard of no "decodificador" beferr.  
> 
> 
> Give the guy a break.
> 
> Given his two posts, it seems he is for real and actually
> have used some translator-bot to translate the message from
> whatever his native language is. I can hardly imagine the
> reverses situation where I were forced to formulate a question
> in, say, Japanese to get help.

Translate the question through Babelfish twice: in forward and in 
backward direction. Modify the original text until the output will be 
more or less sensible; hopefully it will be reasonable in Japanese as 
well. Perhaps, such procedure of optimization could be automated.

Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com

On 27 Des, 03:23, robert bristow-johnson <r...@audioimagination.com>
wrote:
> On Dec 26, 7:59&#4294967295;pm, "owpex" <chipko...@hotmail.com> wrote:
> ...
>
>
>
> > Thank you &#4294967295;very much and sorry &#4294967295;for my translator-english
>
> i ain't never even heard of no "decodificador" beferr. &#4294967295;

Give the guy a break.

Given his two posts, it seems he is for real and actually
have used some translator-bot to translate the message from
whatever his native language is. I can hardly imagine the
reverses situation where I were forced to formulate a question
in, say, Japanese to get help.

Rune

On Dec 26, 7:59&#4294967295;pm, "owpex" <chipko...@hotmail.com> wrote:
...
>
> Thank you &#4294967295;very much and sorry &#4294967295;for my translator-english

i ain't never even heard of no "decodificador" beferr.  i wonders what
them things is.  where can i pick me up one of them decodificadors?
maybe at the same place where i get my Kalman filters, are they
expensive?

;-)

r b-j

My interest takes root in knowing the qualit diferencia of image
between(among) a sign, for example, with BER before Viterbi of 1e-6 and
other one with BER of 1e-2 
From the point of view of the technician installer is interesting to be
able to offer to a client the major quality of possible image, but visually
it is very difficult to know the quality of a digital image 
If an image with BER before Viterbi of 1e-6 has almost the same quality
that one of BER before Viterbi of 1e-2 probably does not deserve to the
pena to invest(invert) in improving the quality of receipt looking for
better emplacements for to the antena since this work podrian it being done
by the correctors Viterbi and Reed Solomon 

Thank you  very much and sorry  for my translator-english


Eric Jacobsen wrote:
> On 12/21/2009 10:17 AM, Vladimir Vassilevsky wrote:
>> Eric Jacobsen wrote:
>>
>>> The slope gets difficult to measure below error rates of 10e-9 or
>>> 10e-10 or so just because the tests take so long to run, and at some
>>> point in a practical system the limits of the dynamic range and noise
>>> floor will be reached.
>>
>>
>> Brute force simulation isn't practical for low BERs, however it is
>> simple enough to derive the estimates in that case.
>>
> Even with real equipment running real-time it's hard to measure 10e-9 or 
> below with most system.

For real or simulated system, the case of marginally low BER is 
tractable. So the expected BER can be estimated from noise floor and 
code performance. There is no need to make long runs unless the goal is 
verification of the decoder operation.

Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com

On 12/21/2009 10:17 AM, Vladimir Vassilevsky wrote:
>
>
> Eric Jacobsen wrote:
>
>
>> The slope gets difficult to measure below error rates of 10e-9 or
>> 10e-10 or so just because the tests take so long to run, and at some
>> point in a practical system the limits of the dynamic range and noise
>> floor will be reached.
>
> Brute force simulation isn't practical for low BERs, however it is
> simple enough to derive the estimates in that case.
>
> Vladimir Vassilevsky
> DSP and Mixed Signal Design Consultant
> http://www.abvolt.com

Even with real equipment running real-time it's hard to measure 10e-9 or 
below with most system.

-- 
Eric Jacobsen
Minister of Algorithms
Abineau Communications
http://www.abineau.com