OFDM transmitters: analog representation and DFT-based implementation

  • Authors:

  • Yuan-Pei Lin;See-May Phoong

  • Affiliations:

  • Dept. of Electr. & Control Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan;-

  • Venue:
  • IEEE Transactions on Signal Processing
  • Year:
  • 2003

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Abstract

The implementation of orthogonal frequency division multiplexing (OFDM) transmitters typically consists of a discrete DFT matrix and a digital-to-analog (DAC) converter. Many existing results on the analysis of OFDM systems, e.g., spectral roll-off, are based on a convenient analog representation. We show that the analog representation and the DFT-based OFDM transmitters are equivalent only in special cases. Using the analog system to analyze the DFT-based OFDM system may not be valid if there is no equivalent analog representation.