Fong Bernard, Fong A C M, Hong G Y
Faculty of Engineering, Auckland University of Technology, Auckland 1020, New Zealand.
IEEE Trans Inf Technol Biomed. 2005 Sep;9(3):424-9. doi: 10.1109/titb.2005.847499.
This paper describes the design of a telemedicine system based on next-generation wireless local area networks (WLANs) operating at 17 GHz. Seventeen gigahertz is proposed for next-generation WLAN services offering numerous advantages over traditional IEEE 802.11 networks that operate in the range of 2.4-5 GHz. Orthogonal polarization is often used to increase spectrum efficiency by utilizing signal paths of horizontal and vertical polarization. Radio waves exceeding 10 GHz are particularly vulnerable to signal degradation under the influence of rain which causes an effective reduction in isolation between polarized signal paths. This paper investigates the influence of heavy rain in a tropical region on wide-band microwave signals at 17 GHz using two links provided by a fixed broad-band wireless access system for two-way data exchange between paramedics attending an accident scene and the hospital via microwave equipment installed in the ambulance. We also study the effects of cross polarization and phase rotation due to persistent heavy rainfall in tropical regions.
本文描述了一种基于工作在17吉赫兹的下一代无线局域网（WLAN）的远程医疗系统的设计。17吉赫兹被提议用于下一代WLAN服务，与工作在2.4 - 5吉赫兹频段的传统IEEE 802.11网络相比具有诸多优势。正交极化通常用于通过利用水平和垂直极化的信号路径来提高频谱效率。超过10吉赫兹的无线电波在降雨影响下特别容易受到信号劣化的影响，这会导致极化信号路径之间的隔离有效降低。本文利用一个固定宽带无线接入系统提供的两条链路，研究热带地区暴雨对17吉赫兹宽带微波信号的影响，这两条链路用于在事故现场的护理人员与医院之间通过安装在救护车上的微波设备进行双向数据交换。我们还研究了热带地区持续暴雨导致的交叉极化和相位旋转的影响。
