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Phase Noise Effects on the performance of High-Order Digital Modulation Terahertz Communication System

Chinese Journal of Electronics 2022年第3期31卷 589-594页

作者： DENG Xianjin YANG Hao WU Qiuyu JIANG Jun LIN Changxing Institute of Electronic Engineering China Academy of Engineering Physics Microsystem and Terahertz Research Center China Academy of Engineering Physics

As the carrier frequency goes into the terahertz band, the phase noise of the signal source has increasing impacts on the performance of the communication system. Considering a 16 QAM high-order digital modulation terahertz communication system(DMTCS),by comparing the influence of two kinds of local oscillator signal sources with different phase noise characteristics on the bit error rate(BER) performance of the system based on theoretical analysis and experimental research, it is found that the near-end phase noise of local oscillator signal source has a great influence on the BER performance of the DMTCS. The suppression of phase noise of the local oscillator signal source based on choosing loop bandwidth of the digital phase-locked loop(DPLL) at the receiving end is also discussed. It is found that the negative impacts of phase noise on BER performance of the system can be efficiently decreased by reasonably selecting the loop bandwidth of the DPLL.

关键词： DMTCS DPLL digital phase locked loops quadrature amplitude modulation 16QAM high-order digital modulation terahertz communication system digital phase-locked loop oscillators local oscillator signal source BER performance phase noise bit error rate performance signal sources near-end phase noise effects error statistics

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Underwater Optical Wireless Communications （UOWC） Based on Visible Light

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Journal of Physical Science and Application 2016年第1期6卷 204-211页

作者： Mazin Ali A. Ali Physics Department College of Science AL-Mustansiriyah University Baghdad Iraq

In this paper, we investigate the effect of water attenuation on an underwater optical wireless communication based on LOS model. We take into account parameters including the chlorophyll concentration and also discuss the choice of suitable wavelength for underwater optical wireless communication. Using analytical expressions and calculating the Jerlov water type attenuation, the received signal power is studied. The characteristics of bit error rate for four kinds of optical modulation techniques （OOK, 2FSK, 2DPSK, and L-PPM） are analyzed. The results show that the performance of OOK and 2DPSK are more suitable for underwater optical wireless communication. On the other hand, the wavelength 450 nm is better compared with the wavelength 600 nm.

关键词： Underwater communications optical wireless communications bit error rate performance optical channel line-of-sight.

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