Symbol rate versus BER question

JAlbertoDJ wrote:
>> JAlbertoDJ wrote:
>>>> The answer is NO.
>>>>
>>>> High bitrate: 0101010101010101....
>>>> Low bitrate:  0000111100001111....
>>>>
>>>> Think about it.
>>>>
>>>> VLV
>>>>
>>> But, for example, suposse the case of a BFSK at 1 baud.
>>>
>>> F0= 1000 Hz
>>> F1= 2000 Hz
>>>
>>> Frecuency carrier error maximum: +-10 Hz.
>> You make things up. How can you get that kind of frequency error? cheap 
>> crystals are good to a part in 10e-7. Nobody with any sense would assign
> 
>> two frequencies in simple harmonic relation.
> 
> In the case of an example, somebody with a sense could assign two
> frequencies in simple harmonic relation.

n the case of an example, somebody with a sense could design a bicycle 
with square wheels, but it wouldn't be a sensible bicycle.

>>> Then, signal received during interval of 1 bit, for example could be:
>>>
>>> F0= 1006 Hz
>>> F1= 1997 Hz
>>>
>>> At 1 baud signal received is out of the range of the macht filter. 
>> The longer the symbol lasts, the more time there is to integrate. 
>> Integration reduces noise.
> 
> Integration reduces noise, but if frecuency is not estable you can be
> integrating only noise.

You make up fairy examples. If the signal frequency can change at the 
rate of 6 Hz/sec, the sidebands will cause problems. What technology is 
as poor as you choose to suppose? How accurate is your cheap wristwatch?

Jerry
-- 
Drink deep or taste not the Perian spring.
A little knowledge is a dangerous thing.
                                             Alexander Pope.
�����������������������������������������������������������������������

>You make up fairy examples. If the signal frequency can change at the 
>rate of 6 Hz/sec, the sidebands will cause problems. What technology is 
>as poor as you choose to suppose? How accurate is your cheap wristwatch?
>

For example, i know that doppler spread of ionospheric can be about 3Hz. 

On Nov 9, 3:33&#4294967295;pm, Jerry Avins <j...@ieee.org> misquoted:


> --
> Drink deep or taste not the Perian spring.
> A little knowledge is a dangerous thing.
> &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295; &#4294967295;Alexander Pope.


Please, Jerry, if you must change your .sig file and use a quote,
(I very much prefer your usual .sig), use the right words.  Here is
what Alexander Pope actually said.....

First used by Alexander Pope (1688 - 1744) in An Essay on Criticism,
1709:

    "A little learning is a dangerous thing; drink deep, or taste not
the Pierian spring: there shallow draughts intoxicate the brain, and
drinking largely sobers us again."


I suppose the Perian spring is where Perier water (usually mis-spelled
as Perrier water) comes from,,,,

--Dilip Nitpick

JAlbertoDJ wrote:
>> You make up fairy examples. If the signal frequency can change at the 
>> rate of 6 Hz/sec, the sidebands will cause problems. What technology is 
>> as poor as you choose to suppose? How accurate is your cheap wristwatch?
>>
> 
> For example, i know that doppler spread of ionospheric can be about 3Hz. 

How fast? Investigate AFC. http://tinyurl.com/y93pb3w

Jerry
-- 
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������

dvsarwate wrote:
> On Nov 9, 3:33 pm, Jerry Avins <j...@ieee.org> misquoted:
> 
> 
>> --
>> Drink deep or taste not the Perian spring.
>> A little knowledge is a dangerous thing.
>>                                              Alexander Pope.
> 
> 
> Please, Jerry, if you must change your .sig file and use a quote,
> (I very much prefer your usual .sig), use the right words.  Here is
> what Alexander Pope actually said.....
> 
> First used by Alexander Pope (1688 - 1744) in An Essay on Criticism,
> 1709:
> 
>     "A little learning is a dangerous thing; drink deep, or taste not
> the Pierian spring: there shallow draughts intoxicate the brain, and
> drinking largely sobers us again."
> 
> 
> I suppose the Perian spring is where Perier water (usually mis-spelled
> as Perrier water) comes from,,,,
> 
> --Dilip Nitpick

A good nit. I even spelled Pierian wrong. My Greek Mythology has become 
rusty. "A little knowledge is a dangerous thing." :-)

Jerry
-- 
Engineering is the art of making what you want from things you can get.
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