Capacity Maximization of OWC Systems via Joint Precoding and Probabilistic Shaping

We propose and experimentally demonstrate a capacity-approaching scheme via joint probabilistic shaping (PS) and precoding in an optical wireless communication (OWC) system. Different from the bit-and-power- and entropy-loading schemes, the proposed scheme only requires one modulation format with on...

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Bibliographic Details
Published in:IEEE photonics technology letters 2019-07, Vol.31 (13), p.1013-1016
Main Authors: Shao, Yingjie, Hong, Yang, Hu, Zhouyi, Chen, Lian-Kuan
Format: Article
Language:English
Subjects:
Communications systems
Entropy
Filling
Loading
Maximization
OFDM
optical OFDM
Optical transmitters
Optical wireless communication
Optimization
Precoding
probabilistic shaping
Signal to noise ratio
Wireless communications
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Summary:We propose and experimentally demonstrate a capacity-approaching scheme via joint probabilistic shaping (PS) and precoding in an optical wireless communication (OWC) system. Different from the bit-and-power- and entropy-loading schemes, the proposed scheme only requires one modulation format with one single-PS distribution while offering the ability of maximizing the system's throughput. Moreover, we show that the proposed scheme also exhibits superior spectral efficiency (SE) and generalized mutual information (GMI) performances. As a result, the implementation complexity is significantly reduced without affecting the capacity-approaching capability. We show that for a 36-Gbit/s OWC transmission, ~5 dB improvement in the received optical power (ROP) sensitivity can be achieved by using the proposed scheme. In addition, a maximized 48-Gbit/s transmission over 2-m OWC channel is successfully demonstrated with a BER lower than 3.8 × 10 -3 , which corresponds to more than 33% capacity enhancement.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2019.2916201