无线通信原理

john019

1．无线信道...................................................................1 1．1自由空间无线电波传播..................................................................................................1 1．2移动通信的电波传播特点..............................................................................................1 1．3移动通信电波传播特性..................................................................................................2 1．3．1短期（快）衰落................................................................................................3 1．3．2长期（慢）衰落................................................................................................6 1．3．3衰落特性............................................................................................................6 1．4电波传播损耗预测模型..................................................................................................6 1．4．1 Okumura-Hata模型...........................................................................................7 1．4．2 COST231 Walfisch-Ikegami模型.....................................................................9 1．5覆盖设计........................................................................................................................10 1．5．1传播模型的选用及修正..................................................................................11 1．5．1基站覆盖预测..................................................................................................11 1．5．3功率控制..........................................................................................................14 2．分集技术.................................................................15 2．1分集技术的概念.............................................................................................................15 2．2分集技术的分类.............................................................................................................15 2．3显分集技术....................................................................................................................15 2．3．1空间分集..........................................................................................................15 2．3．2极化分集..........................................................................................................16 2．4显分集的合并技术........................................................................................................18 2．4．1信号合并准则..................................................................................................18 2．4．2最大信噪比准则下的信号合并方法..............................................................18 2．5隐分集技术....................................................................................................................19 3．无线通信多址技术.................................................21 3．1 多址技术概述...............................................................................................................21 3．2 频分多址.......................................................................................................................21 3．3 时分多址.......................................................................................................................22 3．4 码分多址.......................................................................................................................22 3．5 扩频技术.......................................................................................................................25 3．6 空分多址.......................................................................................................................27 4．无线通信中的资源分配原理及算法举例.............31 4．1蜂窝的概念....................................................................................................................31 4．2以GSM为例介绍FCA................................................................................................31 4．3 PHS无线市话的频率使用...........................................................................................33 4．3．1频率分配..........................................................................................................33 4．3．2 PHS 频率指配................................................................................................35 4．4多信道共用技术............................................................................................................35 4．5微蜂窝与信道动态分配技术........................................................................................38
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无线通信原理
5．语音编码技术.........................................................41 5．1概述................................................................................................................................41 5．2 脉冲编码调制...............................................................................................................43 5．2．1 脉冲编码调制（PCM）技术........................................................................43 5．2．2自适应差分脉冲编码调制(ADPCM).............................................................48 6．PHS通信系统中的基本调制技术.........................51 6．1调制技术概述................................................................................................................51 6．2 π/4-QPSK调制..............................................................................................................52 6．3 衰落和干扰中π/4-DQPSK的性能............................................................................53 7．天线.........................................................................56 7．1 天线电指标的定义.......................................................................................................56 7．2 天线的高度和间距.......................................................................................................59 7．3 PAS天线选择................................................................................................................60 7．4 ZXPCS基站天线说明..................................................................................................62 7．4．1 天线电性能技术指标.....................................................................................62 7．4．2 天线环境性能指标.........................................................................................63 8．OSI 7层结构简介...................................................65 8．1物理层............................................................................................................................66 8．2数据链路层....................................................................................................................67 8．3网络层............................................................................................................................68 8．4 PHS空中接口协议栈...................................................................................................69 附录...............................................................................71 1．双共技术...........................................................................................................................71 2．单位换算...........................................................................................................................71 3．缩略语...............................................................................................................................72

yin0826

沙发  谢谢

yangboy2

hao zi liao !