NDLI: Proposal for superposed ACO-OFDM using several even subcarriers

Content Provider	IEEE Xplore Digital Library
Author	Kozu, T. Ohuchi, K.
Copyright Year	2015
Description	Author affiliation: Dept. of Eng., Shizuoka Univ., Hamamatsu, Japan (Kozu, T.; Ohuchi, K.)
Abstract	In this paper, we develop the conventional Asymmetrically Clipped Optical OFDM (ACO-OFDM) to propose a new OFDM for optical wireless communication with Intensity Modulation / Direct Detection (IM/DD). Although the conventional ACO-OFDM multiplexes only odd subcarriers, we reveal that some even subcarriers do not interfere with odd ones even if we clip their negative signal part. Then, we can superpose those even subcarriers on odd ones. In this paper, we show that the proposed system is able to use 1.5 times as many subcarriers as the conventional ACO-OFDM does in the same bandwidth. However, the superposed even subcarriers are affected by the odd ones in the demodulation process. Hence, we introduce an interference canceller to reduce the interference from the odd ones. We investigate the bit error rate (BER) of the proposed system, and compare it with that of the conventional ACO-OFDM. When we apply 8QAM and 4QAM for the conventional ACO-OFDM and the proposed system, respectively to achieve the same data transmission rate, the proposed system has a better BER about 1 dB than that of the conventional ACO-OFDM.
Starting Page	1
Ending Page	5
File Size	229301
Page Count	5
File Format	PDF
e-ISBN	9781467381185
DOI	10.1109/ICSPCS.2015.7391762
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-12-14
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Integrated optics OFDM Optical attenuators Optical receivers Adaptive optics Optical modulation Optical transmitters
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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