移动通信室内分布系统优化与设计

ABSTRACT

 This article introduces the design and application of indoor distributed system in honeycomb mobile communication engineering. Described the GSM network present situation, and introduced the wireless signal in transmission process fading. Through the building electromagnetic environment description, the article has analyzed in the room “the isolated island”, “the Ping-Pong” phenomena and so on blind spot. Through the field intensity carried on the scene DT test to the building, the article induces the weak signal link which covered in the room. And through simulation test to the room in the method, the article obtains the wireless transmission model in room to carry on the confirmation to this model. Afterwards, carrying on the analysis to the edge field intensity, and determined the edge antenna installment position. In the choice cover plan process, introduced each kind of supply oscillator use environment and determined the supply oscillator type. Explaining the distributed system, the optical fiber distribution system and so on several distributed ways. On the comparison, it had determined cover ways which the place was suitable. Through a series of improvements, the article has obtained the plan which is finally used, the antenna, the primary device, the skeleton line amplifier and so on. After completing the room covers, in room distribute system will inevitably change the big net original cover situations. This article has carried on the analysis to the signal divulging question. Through to in the edge field intensity computation and the building structure, the article proposed avoids method which reveals. Analyzed simultaneously the possible influence to depot rate lost call of base station produces and proposed the solution method. From three different aspects of falls in the speech, the article proposed influence of in room cover to the base depot voice dropout rate, and induced three kinds of reasons as well as the questions which should be paid attention to in the engineering design. Because between the room and outdoor, identical pilot signal can have the cut, in view of this question, the cut control and the realization of smooth transition method are induced. It has built the good foundation for the next work.
 
 Key words: GSM；Honeycomb mobile communication；Repeater；Distribute system indoor

目  录

1  绪论  1
2  室内覆盖背景和意义  2
  2.1移动通信现状和发展  2
  2.2室内移动通信网络现状  2
  2.3室内分布系统常见问题  3
  2.4建设室内覆盖系统的意义和重要性  4
3  室内分布天线系统 6
  3.1室内分布天线系统概述 6
  3.2室内覆盖系统原理 6
     3.2.1有源天线分布系统 7
     3.2.2光纤天线分布系统 8
     3.2.3无源天线分布系统 9
     3.2.4泄漏电缆分布系统 11
     3.2.5有源天线分布系统和无源天线分布系统混合应用简述 13
4   信号覆盖分析 14
  4.1 室内分布天线系统概述  14
  4.2 传播的主要特征  16
   4.3 信号的传输衰落  16
  4.4 建筑物内电磁环境的分析  17
  4.5 影响通信的不利效应  19
  4.6室内覆盖系统对大网影响分析  20
     4.6.1 对基站呼损率的影响  20
     4.6.2 对基站掉话率的影响  20
  4.7 室内、外切换问题的分析  21
     4.7.1 问题的提出  21
     4.7.2 切换的控制  22
     4.7.3 切换区掉话分析  22
  4.8 直放站收、发天线之间的隔离距离  23
5  沈阳二十一世纪大厦室内覆盖系统方案设计  25
  5.1 工程概况  25
     5.1.1 沈阳二十一世纪大厦简介  25
     5.1.2 GSM室内分布覆盖现状  26
  5.2 系统改造思路  26
     5.2.1 改造设计目的 26
  5.2.2 改造设计依据  26
  5.2.3 改造设计原则  27
  5.3 改造设计难点  27
     5.3.1 天馈系统的合理布置  27
     5.3.2 内部软切换区域规划  28
     5.3.3 信号泄露控制  29
     5.3.4 系统扩容等其他情况分析  30
  5.4改造设计技术指标  30
  5.5工程实施方案说明  30
     5.5.1 有源设备的改造  30
     5.5.2 施工规范  31
  5.6改造方案可行性分析  33
     5.6.1 GSM覆盖分析  33
     5.6.2 WCDMA覆盖分析  34
     5.6.3 系统干扰分析  35
     5.6.4 设备利用率分析  35
 5.6.5 系统设计成本优势的分析  35
6  沈阳二十一世纪大厦GSM兼容WCDMA改造  37
  6.1 3G室内覆盖原则  37
  6.2 信号源和室内分布系统的考虑  37
  6.3 沈阳二十一世纪大厦室内分布系统示意图  38
结论  56
致谢   57
参考文献   58
附录A：英文原文   59
附录B：汉语翻译   69