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power spectrum OFDM with and without cyclic prefix

Started by awi ●June 20, 2007
Dear all,

I want to know what is the difference of power spectrum of OFDM with
no added cyclic prefix and power spectrum of OFDM with added cyclic
prefix. Please help me to overcome this problem.

Thanks in advance.

Best regards,
awi
Reply by Krishna ●June 20, 20072007-06-20
On Jun 20, 1:51 pm, awi <nmaed...@gmail.com> wrote:

> Dear all,
>
> I want to know what is the difference of power spectrum of OFDM with
> no added cyclic prefix and power spectrum of OFDM with added cyclic
> prefix. Please help me to overcome this problem.
>
> Thanks in advance.
>
> Best regards,
> awi


Should there be a difference. I do not think so.

Krishna
http://dsplog.blogspot.com
Reply by julius ●June 21, 20072007-06-21
On Jun 20, 9:23 pm, Krishna <krishna.pil...@gmail.com> wrote:


> Should there be a difference. I do not think so.
>
> Krishnahttp://dsplog.blogspot.com


There is a difference.

Julius
Reply by Krishna ●June 22, 20072007-06-22
On Jun 21, 6:24 pm, julius <juli...@gmail.com> wrote:

> On Jun 20, 9:23 pm, Krishna <krishna.pil...@gmail.com> wrote:
>
> > Should there be a difference. I do not think so.
>
> > Krishnahttp://dsplog.blogspot.com
>
> There is a difference.
>
> Julius


Why is the difference? Cyclic prefix is just the copying a portion of
the symbol. Any
pointers might be helpful.

Krishna
http://dsplog.blogspot.com
Reply by Eric Jacobsen ●June 22, 20072007-06-22
On Fri, 22 Jun 2007 03:45:53 -0000, Krishna <krishna.pillai@gmail.com>
wrote:


>On Jun 21, 6:24 pm, julius <juli...@gmail.com> wrote:
>> On Jun 20, 9:23 pm, Krishna <krishna.pil...@gmail.com> wrote:
>>
>> > Should there be a difference. I do not think so.
>>
>> > Krishnahttp://dsplog.blogspot.com
>>
>> There is a difference.
>>
>> Julius
>
>Why is the difference? Cyclic prefix is just the copying a portion of
>the symbol. Any
>pointers might be helpful.
>
>Krishna
>http://dsplog.blogspot.com



What would substitute for the CP if it's not there?    Dead time or
just eliminate the CP and butt the symbols up against each other?
It'll make a difference...

Eric Jacobsen
Minister of Algorithms
Abineau Communications
http://www.ericjacobsen.org
Reply by julius ●June 22, 20072007-06-22
On Jun 22, 12:38 am, Eric Jacobsen <eric.jacob...@ieee.org> wrote:


>
> What would substitute for the CP if it's not there?    Dead time or
> just eliminate the CP and butt the symbols up against each other?
> It'll make a difference...
>
> Eric Jacobsen
> Minister of Algorithms
> Abineau Communicationshttp://www.ericjacobsen.org


Satisfactory solution of this problem may require that the students
consider the relationship between the Fourier series and the
Fourier transform, and to consider deeply what Eric said
above ;-).

Julius