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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 32, Iss. 1 — Jan. 1, 2014
  • pp: 70–80

On the Benefits of Pre-Equalization for ACO-OFDM and Flip-OFDM Indoor Wireless Optical Transmissions Over Dispersive Channels

Poompat Saengudomlert

Journal of Lightwave Technology, Vol. 32, Issue 1, pp. 70-80 (2014)

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This paper analyzes the performances of indoor optical wireless data transmissions based on unipolar orthogonal frequency division multiplexing (OFDM). In particular, it is shown that using frequency-domain pre-equalization can provide benefits in terms of the reduction in the required optical transmit power for a given desired bit error rate (BER) from uncoded transmissions. Known for its power efficiency, asymmetrically clipped optical OFDM (ACO-OFDM) is considered as a unipolar modulation scheme for intensity modulation with direct detection (IM/DD). In addition, flip-OFDM is also considered as an alternative unipolar modulation scheme which is known to be as power efficient as ACO-OFDM. For both ACO-OFDM and flip-OFDM, analytical and simulation results show that using pre-equalization can save up to ${\bf 2}$ dB of transmit optical power for a typical indoor optical wireless transmission scenario with the bit rate of ${\bf 10}$ Mbps and the BER target of ${\bf 10^{-5}}$ .

© 2013 IEEE

Poompat Saengudomlert, "On the Benefits of Pre-Equalization for ACO-OFDM and Flip-OFDM Indoor Wireless Optical Transmissions Over Dispersive Channels," J. Lightwave Technol. 32, 70-80 (2014)

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