Saturday, April 16, 2011

SC-FDMA (Single Carrier Freq Domain Multiple Access)

SC-FDMA (Single Carrier Freq Domain Multiple Access) used in Up-Link in LTE.

    o The system uses SC-FDMA as uplink multiple access method instead OFDMA to decrease the PAPR and power requirements.

    o It offers the same degree of multipath mitigation but because the transmission is
on single carrier PAPR is lower.


     o The basic idea is to add cyclic prefix to the mapped symbols and in the receiver
multipath distortion can be handled by the same method as OFDM (carrier based equalization).

     o The DFT block in the transmitter is used to place the transmission in the correct position of the transmit spectrum in case of variable transmission bandwidth.

     o LTE used localized mapped subcarriers to exploit frequency selective gain.

2 comments :

Elizabeth said...

Thank you
I wish explaining the difference between SC-FDMA and OFDMA & the difference between LTE and WiMAX

Mahmoud zezo said...

I will do it soon specially between SC-FDMA and OFDMA .

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