Time-reversal waveform design for underwater wireless optical communication systems

被引:4
|
作者
Wang, Jiale [1 ]
Lian, Jie [1 ]
机构
[1] Northwestern Polytech Univ, Sch Marine Sci & Technol, Xian, Peoples R China
基金
中国国家自然科学基金;
关键词
OFDM SIGNALS; TRANSMISSION; NM;
D O I
10.1364/OE.493813
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Underwater wireless optical communications (UWOC) is a promising technology to construct underwater Internet of Things. In spite of the great progress in high-speed communication having been realized, scattering, absorption, and turbulence result in an unreliable underwater channel for reliable data transmissions. In this paper, we propose a time-reversal (TR) waveform design technique in UWOC systems for intersymbol interference (ISI) reduction. Due to the optical scattering properties in the ocean, the dispersive channel impulse response (CIR) of UWOC is caused by the multi-path effects of numerous scattered and delayed photons. Based on the analysis and simulation results shown in this paper, the TR waveform is well-suited for UWOC systems. After transmitting the TR waveform, the equivalent channel becomes symmetric, which is easily equalized to mitigate the ISI. Since only the intensity modulation and direct detection can be used for UWOC systems, we derive the UWOC channel as a combination of an exponential bias with the random scattering effects. From the numerical results shown in this work, a phenomenon called the squeezing effect is found, which explains the influence of non-negative channels for the TR waveform design in the UWOC system. Due to the squeezing effect, an equalizer is necessarily applied. With the help of TR waveforms, the bit error rate in the tested environment is greatly better than the case of not using the TR waveform.
引用
收藏
页码:31447 / 31462
页数:16
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