FPGA Central

What is the intutive explanation for precursor ISI.My channel impuls
response is causal, still I get affected by future symbols.Is thi
because
my channel spreads my signal, so when I am detecting a symbol at the pea
of the o/p response,it is much later in time,so future symbols alread
exist, only their peak is later.

I t just means that the strongest ray to the receiver is not the direct
path. This could happen where there is a wall between the transmitter and
receiver but there is a nice reflective surface adjacent to the wall such
that the "main" signal is actually delayed from the first(but much weaker)
signal that arrives.

-Clark

"Zeph80" <[email protected]> wrote in message
news:[email protected] ...
> What is the intutive explanation for precursor ISI.My channel impulse
> response is causal, still I get affected by future symbols.Is this
> because
> my channel spreads my signal, so when I am detecting a symbol at the peak
> of the o/p response,it is much later in time,so future symbols already
> exist, only their peak is later.

Zeph80 wrote:
> What is the intutive explanation for precursor ISI.My channel impulse
> response is causal, still I get affected by future symbols.Is this
> because my channel spreads my signal, so when I am detecting a symbol
> at the peak of the o/p response,it is much later in time,so future
> symbols already exist, only their peak is later.

Yes.

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

>Zeph80 wrote:
>> What is the intutive explanation for precursor ISI.My channel impulse
>> response is causal, still I get affected by future symbols.Is this
>> because my channel spreads my signal, so when I am detecting a symbol
>> at the peak of the o/p response,it is much later in time,so future
>> symbols already exist, only their peak is later.
>
>Yes.
>
>Jerry
>--
>Engineering is the art of making what you want from things you can get.
>¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Thanks