Peak to average power ratio reduction of an OFDM signal using a practical selective mapping approach with embedded side-information

  • Authors:

  • Benjamin Lee;Dilip V. Sarwate;Douglas L. Jones

  • Affiliations:

  • Department of Electrical and Computer Engineering and The Coordinated Science Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL;Department of Electrical and Computer Engineering and The Coordinated Science Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL;Department of Electrical and Computer Engineering and The Coordinated Science Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL

  • Venue:
  • Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
  • Year:
  • 2009

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Abstract

This work evaluates the peak-to-average power ratio (PAPR) performance in a coded orthogonal frequency-division multiplexing (C-OFDM) system using the selective mapping (SLM) approach. Repetition-coded side-information (SI) bits specifying which one of several possible phase sequences is being used are embedded in the data stream at the transmitter before convolutional coding, interleaving, and QAM mapping are applied to the bitstream. The receiver demodulates the received signal using all the possible phase sequences, and then uses the demodulator output in which the demodulated coded SI bits are closest in Hamming distance to the coded SI bits specifying the phase sequence used in that demodulation. It is found that when the number of available phase sequences is four, eight or sixteen, the best performance is obtained when each SI bit is repeated from four to eight times. Our simulation results show that the proposed side-information-embedded SLM C-OFDM system is effective in reducing PAPR.