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.

# MIMO-OFDM BER verification

Started by ●May 18, 2007

Reply by ●May 21, 20072007-05-21

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.

>

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.

>

Reply by ●May 22, 20072007-05-22

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 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.

> >

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 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.

> >

Reply by ●May 22, 20072007-05-22

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 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

> 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.

> > >

> >

> >

> >

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 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

> 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.

> > >

> >

> >

> >