Multilateral Studies for Mobile Communications employing Optical Wireless Signal

我们提出了利用光无线通信对人体和医疗设备无害的新的接入方案。提出了一种新的光移动系统循环发射接入方案。1)提出了一种对有起搏器的人无害的无线光通信接入方案。2)设计了具有多种光发射器和光接收器的光无线通信系统的硬件部件。我们成功地研制了一套可用于测量延迟轮廓的实验系统。3)测量了光线在不锈钢和反射镜上的反射方向图。结果表明，当入射角较大时，我们可以观察到高水平的反射。4)本文完成了光信号在列车内部的传输实验。我们在实际列车上测量了多种晚点分布。我们观察到了…的光信号延迟1.5 ns以上作为反射信号。在不锈钢的情况下，反射信号的强度几乎是直接信号的20%。另一方面，几乎7.3%的直接信号强度是由窗板得到的。5)根据不锈钢和窗板的光信号反射对数字调制信号的影响进行了测量。6)研究了光无线通信在移动通信中的应用。在这篇文章中，我们研究了移动小区的光无线移动通信系统，该系统利用循环发射来减少阴影。我们通过计算机仿真研究了改变系统中发射机数目的情况。在该系统应用于移动通信的情况下，误码率受到发射机之间的同步和距离差异的影响，本文基于这些参数对系统性能进行了分析。通过与已有系统的比较，证明了该系统在无线光通信中的有效性。较少

We have proposed new access schemes which are harmless for human body and medical equipment using optical wireless communication. New access schemes of cyclic emission of optical mobile systems are proposed as well. I denote the results.1) We have proposed a new access scheme for the people in trains by using optical wireless communication which is harmless to the people who have pace maker.2) We have designed hardware components for the optical wireless systems with many kinds of optical emitter and receiver. We have succeeded to develop an experimental system which is useful to measure delay profile.3) We have measured reflection patterns of optical ray for stainless steel and mirror with respect to angles of incidence. As results, we observe high levels of reflections when we have high incident angles.4) Experiments of optical signal propagation inside train has been done by this works. We have measured many kinds of delay profiles in the real train. We observed the optical signal w … More ith 1.5ns delay as reflected signals. The strength of reflected signals are almost 20% of direct signal in case of stainless steel. On the other hand, almost 7.3% of direct signal strength has derived with window pan.5) Measurements of digital modulated signal have been done by this work in terms of affection by optical signal reflections by stainless steel and window pan.6) We have studied optical wireless communication applied to mobile communication. In this paper, we examine optical wireless mobile communication system with movable cells employing cycle emissions in order to reduce shadowing. We examine the case of changing the number of transmitters in this system by computer simulation. In case of this system applied to mobile communication, BER is influenced by difference of synchronization and distance among transmitters; this paper analyzes the performance based upon such parameters. We show this system is effective in optical wireless communication from result of comparing this system with other systems proposed before. Less