LM
01-20-08, 12:01 PM
There is a technique call "time-domain synchronous OFDM" (or TDS-OFDM) that
does not have a CP. Instead of using a CP, a PN sequence is added between
OFDM symbols. This PN sequence is used for frame synchronization,
carrier/symbol tracking and channel estimation. This is the modulation
scheme selected for digital HDTV in China.
You will find a large number of current papers in the IEEE publications.
LM
"karthikbalaguru" <karthikbalaguru79@gmail.com> wrote in message
news:5397de59-cac2-4254-9f7e-cb55ff92305f@s8g2000prg.googlegroups.com...
> Hi,
>
> I understand that zero prefix reduces the transmit power in OFDM based
> systems. Then, why is cyclic prefix(CP) used widely and is more
> popular ?
> Why has WiMAX opted for Cyclic Prefix ?
> Any ideas .
>
> Thx in advans,
> Karthik Balaguru
does not have a CP. Instead of using a CP, a PN sequence is added between
OFDM symbols. This PN sequence is used for frame synchronization,
carrier/symbol tracking and channel estimation. This is the modulation
scheme selected for digital HDTV in China.
You will find a large number of current papers in the IEEE publications.
LM
"karthikbalaguru" <karthikbalaguru79@gmail.com> wrote in message
news:5397de59-cac2-4254-9f7e-cb55ff92305f@s8g2000prg.googlegroups.com...
> Hi,
>
> I understand that zero prefix reduces the transmit power in OFDM based
> systems. Then, why is cyclic prefix(CP) used widely and is more
> popular ?
> Why has WiMAX opted for Cyclic Prefix ?
> Any ideas .
>
> Thx in advans,
> Karthik Balaguru