Laser & Optoelectronics Progress, Volume. 56, Issue 3, 030603(2019)
Performance Analysis of Optical OFDM Adaptive Bit-Power Loading in Indoor Visible Light Communications
The indoor optical wireless channel can be considered as quasi-static multipath channel with inherently low-pass characteristic. Moreover, the visible light communication is usually a power limited system. In order to make full use of the channel spectrum resources and save the energy, the adaptive bit-power loading algorithms of Chow, Hughes-Hartogs and Fischer are applied to the asymmetrically-clipped optical orthogonal frequency division multiplexing (ACO-OFDM) system is proposed. The process of adaptive bit-power loading is introduced, and the performance of the adaptive ACO-OFDM is compared with that of the adaptive direct current optical OFDM (DCO-OFDM). The results show that, compared with the equal bit loading method, the adaptive load algorithm can save about 15% for the optical power and about 30% for the electric power when the performance of bit error rate is guaranteed. Fischer algorithm can save the most optical and electrical power, while Hughes-Hartogs algorithm needs more power. At the same transmit rate, the adaptive ACO-OFDM is more economical than the adaptive DCO-OFDM.
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Kejun Jia, Bin Jin, Li Hao. Performance Analysis of Optical OFDM Adaptive Bit-Power Loading in Indoor Visible Light Communications[J]. Laser & Optoelectronics Progress, 2019, 56(3): 030603
Category: Fiber Optics and Optical Communications
Received: Jul. 5, 2018
Accepted: Aug. 24, 2018
Published Online: Jul. 31, 2019
The Author Email: Jia Kejun (kjjia@lut.cn)