With Orthogonal Frequency-Division Multiple Access (OFDMA) muliple access is achieved by assigning subsets of sub-carriers to individual users. This allows simultaneous low data rate transmission from several users.OFDMA simultaneously supports multiple users by assigning them specific subchannels for intervals of time.So in short,

  • Each terminal occupies a subset of sub-carriers
  • Subset is called an OFDMA traffic channel
  • Each traffic channel is assigned exclusively to one user at any time
  • The IEEE 802.16e/ WiMax use OFDMA as Multiple access technique
  • OFDMA allows different users to transmit over different portions of the broadband spectrum (traffic channel)
  • Simpler Reciever – Only FFT processor is required
  • Bit Error Rate performance is better only in Fading environment

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