OFDMA Orthogonal Frequency Division Multiple Access
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computer science crazy
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03-09-2009, 05:20 PM

Orthogonal Frequency Division Multiple Access (OFDMA) is a multiple access scheme for OFDM systems. It works by assigning a subset of subcarriers to individual users.

OFDMA features


OFDMA is the 'multi-user' version of OFDM

Functions by partitioning the resources in the time-frequency space, by assigning units along the OFDM signal index and OFDM sub-carrier index

Each OFDMA user transmits symbols using sub-carriers that remain orthogonal to those of other users

More than one sub-carrier can be assigned to one user to support high rate applications

Allows simultaneous transmission from several users better spectral efficiency

Multiuser interference is introduced if there is frequency synchronization error

The term 'OFDMA' is claimed to be a registered trademark by Runcom Technologies Ltd., with various other claimants to the underlying technologies through patents.
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