Earticle

The transmission performance of optical labeling based on a combined frequency shift keying/amplitude shift keying (FSK/ASK) format is studied by numerical simulation. The simulation demonstrates that the bit-error ratio (BER) characteristic of an ASK signal is limited by the extinction ratio, received optical power, and dispersion, simultaneously. However, an FSK signal is mainly limited by the extinction ratio (ER) and received optical power when the peak spectrum, which is used to detect the FSK signal, is relatively narrow.

최근 통신 기술의 눈부신 발전과 함께 무선 통신 시스템은 넓고 다양한 영역에서 활용되고 있다. 수중 무선 통신에서 음향 통신 시스템은 기존의 RF에 비해 전송 성능이 우수하여 수중 통신에 다양하게 활용되고 있다. 그러나 음향 통신 시스템은 저속통신, 전송지연 및 제한된 대역폭과 같은 문제점이 있으며, 이러한 음향 통신 시스템의 문제점을 개선하기 위해 수중 가시광 통신에 대한 연구가 활발히 진행되고 있다. 따라서 본 논문에서는 효과적인 수중 가시광 통신을 위해 ASK변조를 이용한 수중 가시광 통신을 제안하였다.

Recently, wireless communication system has been widely used in a variety of fields along with the remarkable advancement of communication technology. Sound communication system in underwater wireless communication is utilized in underwater communication since it has better transmission capacity than the existing RF. However, sound communication system has the problems such as low speed communication, transmission delay and limited bandwidth, and the studies have been actively conducted on the visible light communication underwater to improve these problems. Therefore, the visible light communication underwater using ASK modulation is suggested for the effective communication in this article.

A novel bidirectional magnetic wireless communication system is proposed in this study. This system provides the communication capability between the source and load sides by high-frequency signal while wireless power is transferred. Contrary to the conventional wireless communication systems using complex IC circuit and active components, the proposed system is simply composed of passive components. It is practical and beneficial for environmental robustness, cost effectiveness, and simple implementation. The detailed static analysis of the proposed system for power and communication lines is established. The proposed system is experimentally verified, and results show that a 0.1 voltage gain for communication line is obtained while a 2.0 voltage gain for the power line is achieved. The proposed system is adequate for practical applications as it allows the inductive power transfer system to wirelessly and easily communicate between the source and load sides.