# Shannon's channel capacity with arbitrary noise!!

Started by September 13, 2003
```santosh nath wrote:

...
>=20
>=20
> I am aware of MIMO since we are currently working on 2 x 2 MIMO as part=

> of project. Definitely I meant single link - no resource resuage like M=
IMO.
>=20
> My Belief is that there could some system - may be we have to wait for =
future!!
>=20
> Regards,
> Santosh

Could that system lead us to a hyper-light-speed star drive?

Jerry
--=20
Engineering is the art of making what you want from things you can get.
=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=
=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=
=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF

```
```On Thu, 18 Sep 2003, James K. wrote:

> "Julius Kusuma" <kusuma@mit.edu> wrote in message
> news:Pine.GSO.4.55L.0309171019250.19793@buzzword-bingo.mit.edu...
>
> I have another simple question on this issue, too.
>
> > if the noise is correlated with the data you can use it to help estimate
> > your message.  the problem is now how to contruct the best estimator.
>
> Supppose the noise Nc(D)=H(D)*N(D) is
> significantly correlated the channel H(D).
> Is it not true that after the matched filtering with H*(D^-1),
> this colored noise Nc(D) is more amplified at the receiver
> than a white nose N(D) so it is less capacity achievable.
>

inverse filtering is not optimal, you have to construct the ML detector
for this case.  if the noise is correlated with the channel, the
correlation can be taken advantage of.

a simple example if ML detection for ISI channels, which is using a
sequence estimator (ie, viterbi decoder).  if you had tried to invert the
channel then the noise at the output will be correlated with the channel,
and you know that this is not optimal.

> > --
> > The most rigorous proofs will be shown by vigorous handwaving.
> > http://www.mit.edu/~kusuma
> >
> > opinion of author is not necessarily of the institute
>
> --
> Regards,
> ---
> James (txdiversity@hotmail.com)
> - Private opinions: These are not the opinions from my affiliation.
>
>
>

--
The most rigorous proofs will be shown by vigorous handwaving.
http://www.mit.edu/~kusuma

opinion of author is not necessarily of the institute
```
```Jerry Avins <jya@ieee.org> wrote in message news:<bkhl5k\$fah\$1@bob.news.rcn.net>...
> santosh nath wrote:
>
>    ...
> >
> >
> > I am aware of MIMO since we are currently working on 2 x 2 MIMO as part
>
> > of project. Definitely I meant single link - no resource resuage like M
>  IMO.
> >
> > My Belief is that there could some system - may be we have to wait for
>  future!!
> >
> > Regards,
> > Santosh
>
>
> Could that system lead us to a hyper-light-speed star drive?
>
> Jerry

Remember even light ceases at "Black hole" - time is unlimited there.
When somethings like that comes first it is hard to believe or prove it to
others who are biased!
Regards,
Santosh
```
```santosh nath wrote:

> Jerry Avins <jya@ieee.org> wrote in message news:<bkhl5k\$fah\$1@bob.news=
=2Ercn.net>...
>=20
>>santosh nath wrote:
>>
>>   ...
>>
>>>
>>>I am aware of MIMO since we are currently working on 2 x 2 MIMO as par=
t
>>
>>=20
>>
>>>of project. Definitely I meant single link - no resource resuage like =
M
>>
>> IMO.
>>
>>>My Belief is that there could some system - may be we have to wait for=
=20
>>
>> future!!
>>
>>>Regards,
>>>Santosh
>>
>>
>>Could that system lead us to a hyper-light-speed star drive?
>>
>>Jerry
>=20
>=20
> Remember even light ceases at "Black hole" - time is unlimited there.
> When somethings like that comes first it is hard to believe or prove it=
to
> others who are biased!
> Regards,
> Santosh

Paraphrasing William James: When something is new, they say it isn't=20
true. Later, when its truth becomes evident, they say it isn't useful.=20
Finally, when its utility is manifest, they say, "So what? It's old!"

Jerry
--=20
Engineering is the art of making what you want from things you can get.
=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=
=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=
=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF

```
```santosh.nath@ntlworld.com (santosh nath) wrote in message news:<6afd943a.0309192306.6b2f8983@posting.google.com>...
> I am aware of MIMO since we are currently working on 2 x 2 MIMO as part
> of project. Definitely I meant single link - no resource resuage like MIMO.

If you much aware of MIMO and its capacity, you can read below mail: