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
Zero Prefix and the CP
Jan 18, 2008
1 Replies
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
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