Optical wireless sensor network system using corner cube retroreflectors (CCRs)

S. Teramoto, T. Ohtsuki
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引用次数: 30

Abstract

We analyze the optical wireless sensor network system using corner cube retroreflectors (CCRs). A CCR consists of three concave mirrors. When a light beam enters the CCR, it bounces off each of the three mirrors and is reflected back parallel to the direction it entered. A CCR sends information towards a base station modulating the reflected beam by operation of vibrating CCR or shielding of light pass, and one can transmit an on-off-keying (OOK) modulated optical signal. In optical communications, a CCR is attractive, because of its small size, ease of operation, and low power consumption. In this analysis, we evaluate two decisions at the fusion center, the collective decision and the majority decision. The collective decision is that all the information detected by the sensors is collected by one photodetector (PD), and then the hard decision is done. The majority decision is that each information detected by the sensor is respectively received by each PD, the hard detection is done for each PD output, and decided by majority. We show that the bit error rates (BERs) of the systems are improved as the number of sensors increases. We also show that when the transmitted optical power is adequately large, the BERs of the systems depend on the accuracy of the sensors. We confirm that the BERs of the systems using the collective decision are better than those of the systems using the majority decision.
基于角立方反射器的无线传感网络系统
分析了采用角立方反射器的无线光学传感器网络系统。CCR由三个凹面镜组成。当一束光进入CCR时,它被三个反射镜中的每一个反射镜反射回来,并与它进入的方向平行。通过振动CCR或屏蔽光通,CCR向调制反射光束的基站发送信息,并且可以传输开-关键(OOK)调制光信号。在光通信中,CCR因其体积小、易于操作和低功耗而具有吸引力。在这个分析中,我们在融合中心评估两种决策,集体决策和多数决策。集体决策是由一个光电探测器(PD)收集所有传感器检测到的信息,然后进行硬决策。多数决定是将传感器检测到的每个信息分别由每个PD接收,对每个PD输出进行硬检测,多数决定。我们表明,系统的误码率(ber)随着传感器数量的增加而提高。我们还表明,当传输光功率足够大时,系统的ber取决于传感器的精度。我们证实了使用集体决策的系统的ber优于使用多数决策的系统。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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