FPGA Central

Hi

I am a little confused and was wondering whether someone can help me ou
please. I am reading about orthogonality between channel transfer vector
(NO MIMO) and i am wondering whether this would lead to no interferenc
between the users that have different channel transfer vectors.

what is a channel transfer vector when there is no mimo?

would orthogonal transfer vectors lead to no interference between thes
users?

thanks very much

leo

On Sep 7, 1:24*pm, "leonardo232" <leosivri...@gmail.com> wrote:
> Hi
>
> I am a little confused and was wondering whether someone can help me out
> please. I am reading about orthogonality between channel transfer vectors
> (NO MIMO) and i am wondering whether this would lead to no interference
> between the users that have different channel transfer vectors.
>
> what is a channel transfer vector when there is no mimo?
>
> would orthogonal transfer vectors lead to no interference between these
> users?
>
> thanks very much
>
> leo

Well, I'm confused as to what exactly you are saying. Can you write
something down mathematically or symbolically, please?

The definition of "MIMO" is itself a little vague. To many, it is
taken to
mean multiple antennas. To some, it can be any vector representation.

So let me ask you this: suppose that you use a TDMA scheme that is
perfectly synched, such that the time slots are perfectly arranged
between the users. Do you consider this to be a MIMO system?
How would you write a vector representation of it?

Julius

>On Sep 7, 1:24=A0pm, "leonardo232" <leosivri...@gmail.com> wrote:
>> Hi
>>
>> I am a little confused and was wondering whether someone can help m
out
>> please. I am reading about orthogonality between channel transfe
vectors
>> (NO MIMO) and i am wondering whether this would lead to n
interference
>> between the users that have different channel transfer vectors.
>>
>> what is a channel transfer vector when there is no mimo?
>>
>> would orthogonal transfer vectors lead to no interference betwee
these
>> users?
>>
>> thanks very much
>>
>> leo
>
>Well, I'm confused as to what exactly you are saying. Can you write
>something down mathematically or symbolically, please?
>
>The definition of "MIMO" is itself a little vague. To many, it is
>taken to
>mean multiple antennas. To some, it can be any vector representation.
>
>So let me ask you this: suppose that you use a TDMA scheme that is
>perfectly synched, such that the time slots are perfectly arranged
>between the users. Do you consider this to be a MIMO system?
>How would you write a vector representation of it?
>
>Julius
>
Hi

thanks for replying

I will try and explain the problem. When I mentioned no MIMO I meant tha
there is just one antenna at the Tx and one at the Rx. In this case an
assuming you know the Channel information of different users in an OFDM
cell under what circumstances would two different user signals b
orthogonal? I have been reading about MIMO and it says that the dot produc
of the channel transfer vectors would be zero. Assuming there is no MIM
does this still hold? If it does hold is there a channel transfer vecto
when there is no MIMO present or just a single scalar??

Any help greatly appreciated
>

On Sep 7, 6:31*pm, "leonardo232" <leosivri...@gmail.com> wrote:
> >On Sep 7, 1:24=A0pm, "leonardo232" <leosivri...@gmail.com> wrote:
> >> Hi
>
> >> I am a little confused and was wondering whether someone can help me
> out
> >> please. I am reading about orthogonality between channel transfer
> vectors
> >> (NO MIMO) and i am wondering whether this would lead to no
> interference
> >> between the users that have different channel transfer vectors.
>
> >> what is a channel transfer vector when there is no mimo?
>
> >> would orthogonal transfer vectors lead to no interference between
> these
> >> users?
>
> >> thanks very much
>
> >> leo
>
> >Well, I'm confused as to what exactly you are saying. *Can you write
> >something down mathematically or symbolically, please?
>
> >The definition of "MIMO" is itself a little vague. *To many, it is
> >taken to
> >mean multiple antennas. *To some, it can be any vector representation.
>
> >So let me ask you this: *suppose that you use a TDMA scheme that is
> >perfectly synched, such that the time slots are perfectly arranged
> >between the users. *Do you consider this to be a MIMO system?
> >How would you write a vector representation of it?
>
> >Julius
>
> Hi
>
> thanks for replying
>
> I will try and explain the problem. When I mentioned no MIMO I meant that
> there is just one antenna at the Tx and one at the Rx. In this case and
> assuming you know the Channel information of different users in an OFDMA
> cell under what circumstances would two different user signals be
> orthogonal? I have been reading about MIMO and it says that the dot product
> of the channel transfer vectors would be zero. Assuming there is no MIMO
> does this still hold? If it does hold is there a channel transfer vector
> when there is no MIMO present or just a single scalar??
>
> Any help greatly appreciated
>
>

I think that in this case I have given you exactly the example that
you are
asked to find in your homework ;-).

Julius

>On Sep 7, 6:31=A0pm, "leonardo232" <leosivri...@gmail.com> wrote:
>> >On Sep 7, 1:24=3DA0pm, "leonardo232" <leosivri...@gmail.com> wrote:
>> >> Hi
>>
>> >> I am a little confused and was wondering whether someone can hel
me
>> out
>> >> please. I am reading about orthogonality between channel transfer
>> vectors
>> >> (NO MIMO) and i am wondering whether this would lead to no
>> interference
>> >> between the users that have different channel transfer vectors.
>>
>> >> what is a channel transfer vector when there is no mimo?
>>
>> >> would orthogonal transfer vectors lead to no interference between
>> these
>> >> users?
>>
>> >> thanks very much
>>
>> >> leo
>>
>> >Well, I'm confused as to what exactly you are saying. =A0Can yo
write
>> >something down mathematically or symbolically, please?
>>
>> >The definition of "MIMO" is itself a little vague. =A0To many, it is
>> >taken to
>> >mean multiple antennas. =A0To some, it can be any vecto
representation.
>>
>> >So let me ask you this: =A0suppose that you use a TDMA scheme that is
>> >perfectly synched, such that the time slots are perfectly arranged
>> >between the users. =A0Do you consider this to be a MIMO system?
>> >How would you write a vector representation of it?
>>
>> >Julius
>>
>> Hi
>>
>> thanks for replying
>>
>> I will try and explain the problem. When I mentioned no MIMO I mean
that
>> there is just one antenna at the Tx and one at the Rx. In this cas
and
>> assuming you know the Channel information of different users in a
OFDMA
>> cell under what circumstances would two different user signals be
>> orthogonal? I have been reading about MIMO and it says that the do
produ=
>ct
>> of the channel transfer vectors would be zero. Assuming there is n
MIMO
>> does this still hold? If it does hold is there a channel transfe
vector
>> when there is no MIMO present or just a single scalar??
>>
>> Any help greatly appreciated
>>
>>
>
>I think that in this case I have given you exactly the example that
>you are
>asked to find in your homework ;-).
>
>Julius

???????????????????????????///////

i am still confused please help. 2 users with different signals in th
cell. when will their signals be orthogonal??? does this lead to n
interference??? is their a channel vector when no mimo is present??

>>On Sep 7, 6:31=A0pm, "leonardo232" <leosivri...@gmail.com> wrote:
>>> >On Sep 7, 1:24=3DA0pm, "leonardo232" <leosivri...@gmail.com> wrote:
>>> >> Hi
>>>
>>> >> I am a little confused and was wondering whether someone can help
>me
>>> out
>>> >> please. I am reading about orthogonality between channel transfer
>>> vectors
>>> >> (NO MIMO) and i am wondering whether this would lead to no
>>> interference
>>> >> between the users that have different channel transfer vectors.
>>>
>>> >> what is a channel transfer vector when there is no mimo?
>>>
>>> >> would orthogonal transfer vectors lead to no interference between
>>> these
>>> >> users?
>>>
>>> >> thanks very much
>>>
>>> >> leo
>>>
>>> >Well, I'm confused as to what exactly you are saying. =A0Can you
>write
>>> >something down mathematically or symbolically, please?
>>>
>>> >The definition of "MIMO" is itself a little vague. =A0To many, it is
>>> >taken to
>>> >mean multiple antennas. =A0To some, it can be any vector
>representation.
>>>
>>> >So let me ask you this: =A0suppose that you use a TDMA scheme tha
is
>>> >perfectly synched, such that the time slots are perfectly arranged
>>> >between the users. =A0Do you consider this to be a MIMO system?
>>> >How would you write a vector representation of it?
>>>
>>> >Julius
>>>
>>> Hi
>>>
>>> thanks for replying
>>>
>>> I will try and explain the problem. When I mentioned no MIMO I meant
>that
>>> there is just one antenna at the Tx and one at the Rx. In this case
>and
>>> assuming you know the Channel information of different users in an
>OFDMA
>>> cell under what circumstances would two different user signals be
>>> orthogonal? I have been reading about MIMO and it says that the dot
>produ=
>>ct
>>> of the channel transfer vectors would be zero. Assuming there is no
>MIMO
>>> does this still hold? If it does hold is there a channel transfer
>vector
>>> when there is no MIMO present or just a single scalar??
>>>
>>> Any help greatly appreciated
>>>
>>>
>>
>>I think that in this case I have given you exactly the example that
>>you are
>>asked to find in your homework ;-).
>>
>>Julius
>
>???????????????????????????///////
>