Hello everyone.

I'm building a MIMO-OFDM simulator.
Can I have some discussion with anyone interested in this,please?

For example, I'm buildiing a 4-by-4 MIMO-OFDM simulator. 
Then, what is the best way I can verify the BER of my MIMO-OFDM simulator?
Since I use 64-PSK, I assumed that, if I adopt a Gaussian channel for MIMO-OFDM with 64-PSK,
then the BER will be the same as 64-PSK in AWGN.
But, the result is not like that.
Sometimes, MIMO-OFDM with 64-PSK in a Gaussian channel performs better than a 64-PSK Gaussian
channel performance. 

Can anyone point out what can be the problem of my coding?
Isn't it no system can perform 64-PSK in AWGN?

Thank you so much. 

Hi,
       We are also working on the same subject. We are
unable to verify any standard plot in this subject.
What kind of detector u are using for MIMO detection.
I assume the performance depends on the detector u are
using.
Best Regards,
-SaiRamesh.
--- l...@hotmail.com wrote:

> Hello everyone.
> 
> I'm building a MIMO-OFDM simulator.
> Can I have some discussion with anyone interested in
> this,please?
> 
> For example, I'm buildiing a 4-by-4 MIMO-OFDM
> simulator. 
> Then, what is the best way I can verify the BER of
> my MIMO-OFDM simulator?
> Since I use 64-PSK, I assumed that, if I adopt a
> Gaussian channel for MIMO-OFDM with 64-PSK, then the
> BER will be the same as 64-PSK in AWGN.
> But, the result is not like that.
> Sometimes, MIMO-OFDM with 64-PSK in a Gaussian
> channel performs better than a 64-PSK Gaussian
> channel performance. 
> 
> Can anyone point out what can be the problem of my
> coding?
> Isn't it no system can perform 64-PSK in AWGN?
> 
> Thank you so much. 
> 

I would start with the 2x2 MIMO (single carrier) before I move to OFDM.  For
the flat-fading channel model, there are numerous
standard results for different receivers, e.g. MMSE, MMSE-SIC, MMSE-OSIC (
e.g. see either David Tse's book or Paulraj's book).

Now, if you go to OFDM for the same channel model, you should see the exact
same performance.

I have done that and verified that I indeed do get the same performance.

thanks
Nandan

On 5/19/07, nammi sairamesh <s...@yahoo.com> wrote:
>
> Hi,
>        We are also working on the same subject. We are
> unable to verify any standard plot in this subject.
> What kind of detector u are using for MIMO detection.
> I assume the performance depends on the detector u are
> using.
> Best Regards,
> -SaiRamesh.
> --- l...@hotmail.com wrote:
>
> > Hello everyone.
> >
> > I'm building a MIMO-OFDM simulator.
> > Can I have some discussion with anyone interested in
> > this,please?
> >
> > For example, I'm buildiing a 4-by-4 MIMO-OFDM
> > simulator.
> > Then, what is the best way I can verify the BER of
> > my MIMO-OFDM simulator?
> >
> >
> > Since I use 64-PSK, I assumed that, if I adopt a
> > Gaussian channel for MIMO-OFDM with 64-PSK, then the
> > BER will be the same as 64-PSK in AWGN.
> > But, the result is not like that.
> > Sometimes, MIMO-OFDM with 64-PSK in a Gaussian
> > channel performs better than a 64-PSK Gaussian
> > channel performance.
> >
> > Can anyone point out what can be the problem of my
> > coding?
> > Isn't it no system can perform 64-PSK in AWGN?
> >
> > Thank you so much.
> >

Hi,
    I do agree with your resul if the channel model is
 flat fading . If you use a frequency selective fading
channel (eg. i.i.d or exponential ), we can not assume
the performance is equal to that of MIMO flat fading
without OFDM.
Best Regards,
-SaiRamesh

--- Nandan Das <n...@gmail.com> wrote:

> I would start with the 2x2 MIMO (single carrier)
> before I move to OFDM.  For
> the flat-fading channel model, there are numerous
> standard results for different receivers, e.g. MMSE,
> MMSE-SIC, MMSE-OSIC (
> e.g. see either David Tse's book or Paulraj's book).
> 
> Now, if you go to OFDM for the same channel model,
> you should see the exact
> same performance.
> 
> I have done that and verified that I indeed do get
> the same performance.
> 
> thanks
> Nandan
> 
> On 5/19/07, nammi sairamesh <s...@yahoo.com>
> wrote:
> >
> > Hi,
> >        We are also working on the same subject. We
> are
> > unable to verify any standard plot in this
> subject.
> > What kind of detector u are using for MIMO
> detection.
> > I assume the performance depends on the detector u
> are
> > using.
> > Best Regards,
> > -SaiRamesh.
> >
> >
> > --- l...@hotmail.com wrote:
> >
> > > Hello everyone.
> > >
> > > I'm building a MIMO-OFDM simulator.
> > > Can I have some discussion with anyone
> interested in
> > > this,please?
> > >
> > > For example, I'm buildiing a 4-by-4 MIMO-OFDM
> > > simulator.
> > > Then, what is the best way I can verify the BER
> of
> > > my MIMO-OFDM simulator?
> > >
> > >
> > > Since I use 64-PSK, I assumed that, if I adopt a
> > > Gaussian channel for MIMO-OFDM with 64-PSK, then
> the
> > > BER will be the same as 64-PSK in AWGN.
> > > But, the result is not like that.
> > > Sometimes, MIMO-OFDM with 64-PSK in a Gaussian
> > > channel performs better than a 64-PSK Gaussian
> > > channel performance.
> > >
> > > Can anyone point out what can be the problem of
> my
> > > coding?
> > > Isn't it no system can perform 64-PSK in AWGN?
> > >
> > > Thank you so much.
> > >
> >
> >
> >