Open AccessPerformance Improvement of ACO-OFDM Indoor Optical Wireless Transmissions Using Partial Pre-Equalization
Author(s) -
Jariya Panta,
Poompat Saengudomlert,
Keattisak Sripimanwat
Publication year - 2015
Publication title -
ecti transactions on electrical eng. / electronics and communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.148
H-Index - 7
ISSN - 1685-9545
DOI - 10.37936/ecti-eec.2016141.171081
Subject(s) - equalization (audio) , optical wireless , orthogonal frequency division multiplexing , computer science , transmitter , channel (broadcasting) , bit error rate , electronic engineering , wireless , optical power , transmitter power output , modulation (music) , computer network , telecommunications , engineering , physics , optics , laser , acoustics
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.