Performance Improvement of ACO-OFDM Indoor Optical Wireless Transmissions Using Partial Pre-Equalization

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Published: Sep 11, 2015
DOI: https://doi.org/10.37936/ecti-eec.2016141.171081
Keywords:
Optical wireless communications IM/DD OFDM ACO-OFDM pre-equalization post-equalization partial pre-equalization

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Jariya Panta
Faculty of Industrial Technology , Ubon Ratchathani Rajabhat University (UBRU)
Poompat Saengudomlert
Center of Research in Optoelectronics, Communications and Control Systems (BU-CROCCS)
Keattisak Sripimanwat
LED-SmartCoN.Org

Abstract

This paper analyzes the performances and presents the benets of partial pre-equalization for indoor optical wireless transmissions based on asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) with intensity modulation and direct detection (IM/DD). In particular, for diffuse indoor optical wireless channels, partial pre-equalization can reduce the optical transmit power over post-equalization at the same target bit error rate (BER) for point-to-point transmissions even with imperfect channel knowledge. To further im-
prove its performance, bit loading is considered to minimize the optical transmit power of ACO-OFDM while maintaining a constant target BER. In addition, broadcast transmissions to multiple users with possibly dierent channel qualities are considered, where pre-equalization is not applicable. Finally, we specify an appropriate channel estimate at the transmitter for such broadcast transmissions.

Article Details

How to Cite
Panta, J., Saengudomlert, P., & Sripimanwat, K. (2015). Performance Improvement of ACO-OFDM Indoor Optical Wireless Transmissions Using Partial Pre-Equalization. ECTI Transactions on Electrical Engineering, Electronics, and Communications, 14(1), 1–11. https://doi.org/10.37936/ecti-eec.2016141.171081
Issue
Vol. 14 No. 1 (2016): Regular Issue
Section
Communication Systems

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