毕业设计（论文） 电子信息工程 外文文献翻译 中英文.doc

附 录 一、英文原文 Research and Development on Indoor 3G Wireless Network Planning Platform Peiliang CHAI Hangzhou Normal University Hangzhou, China, 310017 chaipl@126.com Liang ZHANG Hangzhou Normal University Hangzhou, China, 310017 zhl@ Abstract—In this paper, the situation of 3G wireless technology developments and problems in indoor wireless network design are firstly introduced. The function requirements and architecture for the platform of 3G indoor wireless network design are discussed where the key technologies of the platform design and implementation are analyzed. Finally, this paper concludes the urgency of indoor plan and points out the prospect of the indoor wireless design software. Keywords-Propagation Modeling; Indoor Wireless Planning; Digital Simulation; Visual Analysis I. INTRODUCTION With the development of 3G mobile communications, the coverage of indoor 3G wireless network is becoming more and more important. Recent statistics shows that the high-value customers 80% of working time is in the room. DoCoMo forecast that 20% of indoor coverage of 3G will bring 80% of benefits, and they believe that indoor and outdoor 3G wireless networking should be equal attention and carried out simultaneously at the initial construction. [1] In this context, indoor coverage system is even more important. [2, 3] II. INDOOR WIRELESS COMMUNICATIONS A. Problems For the rapid increasing in mobile user number, the requirement of communication services density and coverage is increasing. Unfortunately, the high-rise buildings in the city have a strong shielding effect on wireless signal. So there are a great number of blind spots and communication crowds in large buildings. The current indoor wireless communication environment is very imperfect, embodied in the following areas: Coverage: Due to building its own shielding and absorption, resulting in greater transmission attenuation of radio signals, and formatting weak radio signal areas or even blind fields; Capacity