Interference - Co-Channel and Inter-symbol

Hi,
Is Co-Channel Interference difficult to be overcome than Inter-Symbol
Interference in radio environment ?
I serached the internet, but did not get any specifc link that talks
about these in detail.
Any ideas ?

Thx in advans,
Karthik Balaguru

karthikbalaguru wrote:
> Hi,
> Is Co-Channel Interference difficult to be overcome than Inter-Symbol
> Interference in radio environment ?
> I serached the internet, but did not get any specifc link that talks
> about these in detail.
> Any ideas ?

It depends on the relative strength of the co-channel interference. ISI
has some of the predictability of an echo, and so can be dealt with in
ways that don't work with co-channel interference.

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

On Jan 28, 11:22 am, karthikbalaguru <karthikbalagur...@gmail.com>
wrote:
> Hi,
> Is Co-Channel Interference difficult to be overcome than Inter-Symbol
> Interference in radio environment ?
> I serached the internet, but did not get any specifc link that talks
> about these in detail.
> Any ideas ?
>
> Thx in advans,
> Karthik Balaguru

Of course there are no specific links, since your question is not
sufficiently specific in and by itself. The only general statement
that can be made is that ISI is usually modeled as a convolution
between the input signal and a linear, time-invariant channel. In
that case, it may be possible to undo the effect of ISI by either
explicitly estimating the transmitted signal -- which is the whole
point of communication -- or at least knowing what the transmitted
signal looks like.

Whereas for co-channel interference, even if the modulation format
is identical, you may end up decoding for two users in order to
cancel them.

Of course, like Jerry pointed out, it depends on the relative
strengths.

Or something like that ;-).

Julius

julius wrote:

...

> Whereas for co-channel interference, even if the modulation format
> is identical, you may end up decoding for two users in order to
> cancel them.

Easier to say than to do. Suppose a conversation taking place in a room
with a radio playing. The radio, being louder, makes the conversation
nearly unintelligible. On television, that's no problem. The nerd guru
twiddles a few knobs, types a few lines on a keyboard, and the
conversation is clear. Now lets get real. Somehow, a clean recording of
the broadcast is available. How much will that help?

...

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

On Jan 29, 1:52*am, Jerry Avins <j...@ieee.org> wrote:
> karthikbalaguru wrote:
> > Hi,
> > Is Co-Channel Interference difficult to be overcome than Inter-Symbol
> > Interference in radio environment ?
> > I serached the internet, but did not get any specifc link that talks
> > about these in detail.
> > Any ideas ?
>
> It depends on the relative strength of the co-channel interference. ISI
> has some of the predictability of an echo, and so can be dealt with in
> ways that don't work with co-channel interference.
>

Thx for that info !
How can Adjacent channel interference(ACI) be rated in terms of
difficulty in
comparison with ISI and CCI ? I am just curious to know about the Most
difficult noise
to be overcome in radio communicaton.

Karthik Balaguru

On Jan 29, 9:00 pm, karthikbalaguru <karthikbalagur...@gmail.com>
wrote:
> On Jan 29, 1:52 am, Jerry Avins <j...@ieee.org> wrote:
>
> > karthikbalaguru wrote:
> > > Hi,
> > > Is Co-Channel Interference difficult to be overcome than Inter-Symbol
> > > Interference in radio environment ?
> > > I serached the internet, but did not get any specifc link that talks
> > > about these in detail.
> > > Any ideas ?
>
> > It depends on the relative strength of the co-channel interference. ISI
> > has some of the predictability of an echo, and so can be dealt with in
> > ways that don't work with co-channel interference.
>
> Thx for that info !
> How can Adjacent channel interference(ACI) be rated in terms of
> difficulty in
> comparison with ISI and CCI ? I am just curious to know about the Most
> difficult noise
> to be overcome in radio communicaton.
>
> Karthik Balaguru

IMO, the most difficult is in channel phase noise from a strong
adjacent signal.

John