📄 g3-1.htm
字号:
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-ALIGN: justify"><FONT
face=楷体_GB2312 color=#000066><SPAN lang=EN-US
style="mso-hansi-font-family: Times New Roman">图3-2
900MHz频段数字蜂窝移动通信网的频道配置<SPAN style="mso-spacerun: yes">
</SPAN><O:P></O:P></SPAN></FONT></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-INDENT: 21pt; TEXT-ALIGN: justify; mso-char-indent-count: 2.0; mso-char-indent-size: 10.5pt"><FONT
face=楷体_GB2312 color=#000066><SPAN lang=EN-US
style="mso-hansi-font-family: Times New Roman">fl(n)= 890.200MHz
＋（n-1）</SPAN><SPAN lang=EN-US
style="mso-hansi-font-family: Times New Roman; mso-char-type: symbol; mso-symbol-font-family: Symbol; mso-ascii-font-family: 宋体">´</SPAN><SPAN
lang=EN-US style="mso-hansi-font-family: Times New Roman">
0.200MHz<SPAN style="mso-spacerun: yes"> </SPAN>移动台发，基站收<O:P>
</O:P></SPAN></FONT></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-ALIGN: justify"><FONT
face=楷体_GB2312 color=#000066><SPAN lang=EN-US
style="mso-hansi-font-family: Times New Roman"><SPAN
style="mso-spacerun: yes">
</SPAN>fh(n)= fl(n) ＋ 45MHz<SPAN style="mso-spacerun: yes">
</SPAN>基站发，移动台收<O:P> </O:P></SPAN></FONT></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-INDENT: 21pt; TEXT-ALIGN: justify"><FONT
face=楷体_GB2312 color=#000066><SPAN lang=EN-US
style="mso-hansi-font-family: Times New Roman">n=
76～124频道 </SPAN></FONT><SPAN lang=EN-US
style="mso-hansi-font-family: Times New Roman"><O:P>
</O:P></SPAN></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-ALIGN: justify"><SPAN
lang=EN-US style="mso-hansi-font-family: Times New Roman"><SPAN
style="mso-spacerun: yes">
</SPAN><B>（4）双工收发间隔：45kHz。</B>与模拟TACS系统相同。<O:P> </O:P></SPAN></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-ALIGN: justify"><SPAN
lang=EN-US style="mso-hansi-font-family: Times New Roman"><SPAN
style="mso-spacerun: yes"> </SPAN><FONT
face=楷体_GB2312
color=#000066>发射标识：业务信道发射标识为271KF7W；控制信道发射标识为271KF7W。<O:P>
</O:P></FONT></SPAN></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-ALIGN: justify"><FONT
face=楷体_GB2312 color=#000066><SPAN lang=EN-US
style="mso-hansi-font-family: Times New Roman"><SPAN
style="mso-spacerun: yes">
</SPAN>271K<SPAN
style="mso-spacerun: yes">
</SPAN>F<SPAN
style="mso-spacerun: yes">
</SPAN>7<SPAN
style="mso-spacerun: yes">
</SPAN>W<O:P> </O:P></SPAN></FONT></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-ALIGN: justify"><FONT
face=楷体_GB2312 color=#000066> <SPAN
style="mso-hansi-font-family: Times New Roman">必要带宽<SPAN
lang=EN-US>271kHz<O:P> </O:P></SPAN></SPAN></FONT></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-ALIGN: justify"><FONT
face=楷体_GB2312 color=#000066> <SPAN
style="mso-hansi-font-family: Times New Roman">主载波调制方式： 调频 <SPAN
lang=EN-US><O:P></O:P></SPAN></SPAN></FONT></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-ALIGN: justify"><FONT
face=楷体_GB2312 color=#000066><SPAN lang=EN-US
style="mso-hansi-font-family: Times New Roman"><SPAN
style="mso-spacerun: yes">
</SPAN>调制主载波的信号性质：<SPAN style="mso-spacerun: yes">
</SPAN>包含量化或数字信息的双信道或多信道<O:P> </O:P></SPAN></FONT></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-ALIGN: justify"><FONT
face=楷体_GB2312 color=#000066><SPAN lang=EN-US
style="mso-hansi-font-family: Times New Roman"><SPAN
style="mso-spacerun: yes">
</SPAN>被发送信息的类型： 电报传真数据、遥测、遥控、电话视频的组合 </SPAN></FONT><SPAN
lang=EN-US style="mso-hansi-font-family: Times New Roman"><O:P>
</O:P></SPAN></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-ALIGN: justify"><SPAN
lang=EN-US style="mso-hansi-font-family: Times New Roman"><SPAN
style="mso-spacerun: yes"> </SPAN><B>（5）干扰保护比<O:P>
</O:P></B></SPAN></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-INDENT: 21pt; TEXT-ALIGN: justify"><SPAN
style="mso-hansi-font-family: Times New Roman"><FONT face=楷体_GB2312
color=#000066>载波干扰保护比（<SPAN
lang=EN-US>C／I）就是指接收到的希望信号电平与非希望信号电平的比值，此比值与MS的瞬时位置有关。这是由于地形不规则性及本地散射体的形状、类型及数量不同，以及其它一些因素如天线类型、方向性及高度，站址的标高及位置，当地的干扰源数目等所造成的。<SPAN
style="mso-spacerun: yes">
</SPAN><O:P></O:P></SPAN></FONT></SPAN></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-INDENT: 21pt; TEXT-ALIGN: justify"><FONT
face=楷体_GB2312 color=#000066><SPAN lang=EN-US
style="mso-hansi-font-family: Times New Roman">GSM规范中规定：<O:P>
</O:P></SPAN></FONT></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-ALIGN: justify"><FONT
face=楷体_GB2312 color=#000066><SPAN lang=EN-US
style="mso-hansi-font-family: Times New Roman"><SPAN
style="mso-spacerun: yes">
</SPAN>同频道干扰保护比：<SPAN
style="mso-spacerun: yes">
</SPAN>C/I </SPAN><SPAN lang=EN-US
style="FONT-SIZE: 10.5pt; FONT-FAMILY: Symbol; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: Times New Roman; mso-char-type: symbol; mso-symbol-font-family: Symbol; mso-ascii-font-family: 宋体; mso-fareast-font-family: 宋体; mso-bidi-font-family: Times New Roman; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">³</SPAN><SPAN
lang=EN-US style="mso-hansi-font-family: Times New Roman">9dB<O:P>
</O:P></SPAN></FONT></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-ALIGN: justify"><FONT
face=楷体_GB2312 color=#000066><SPAN lang=EN-US
style="mso-hansi-font-family: Times New Roman"><SPAN
style="mso-spacerun: yes">
</SPAN>邻频道干扰保护比：<SPAN
style="mso-spacerun: yes"> </SPAN>C/I
<SPAN lang=EN-US
style="FONT-SIZE: 10.5pt; FONT-FAMILY: Symbol; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: Times New Roman; mso-char-type: symbol; mso-symbol-font-family: Symbol; mso-ascii-font-family: 宋体; mso-fareast-font-family: 宋体; mso-bidi-font-family: Times New Roman; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">³
</SPAN>- 9dB<O:P> </O:P></SPAN></FONT></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-INDENT: 21pt; TEXT-ALIGN: justify"><FONT
face=楷体_GB2312 color=#000066><SPAN
style="mso-hansi-font-family: Times New Roman">载波偏离<SPAN
lang=EN-US>400kHz时的干扰保护比：<SPAN
style="mso-spacerun: yes"> </SPAN>C/I
</SPAN></SPAN><SPAN lang=EN-US
style="mso-hansi-font-family: Times New Roman"><SPAN lang=EN-US
style="FONT-SIZE: 10.5pt; FONT-FAMILY: Symbol; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: Times New Roman; mso-char-type: symbol; mso-symbol-font-family: Symbol; mso-ascii-font-family: 宋体; mso-fareast-font-family: 宋体; mso-bidi-font-family: Times New Roman; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">³</SPAN>
- 41dB <O:P> </O:P></SPAN></FONT></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-ALIGN: justify"><SPAN
lang=EN-US style="mso-hansi-font-family: Times New Roman"><SPAN
style="mso-spacerun: yes"> </SPAN><B>（6）频率复用方式<O:P>
</O:P></B></SPAN></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-ALIGN: justify"><SPAN
lang=EN-US style="mso-hansi-font-family: Times New Roman"><SPAN
style="mso-spacerun: yes">
</SPAN><FONT face=楷体_GB2312
color=#000066>频率复用是指在不同的地理区域上用相同的载波频率进行覆盖。这些区域必须隔开足够的距离，以致所产生的同频道及邻频道干扰的影响可忽略不计。<O:P>
</O:P></FONT></SPAN></P>
<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-INDENT: 21pt; TEXT-ALIGN: justify"><FONT
face=楷体_GB2312 color=#000066><SPAN
style="mso-hansi-font-family: Times New Roman"> 频率复用方式就是指将可用频道分成若干组，若所有可用的频道<SPAN
lang=EN-US>N（如49）分成F组（如9组），则每组的频道数为N／F（49/9 </SPAN></SPAN><SPAN
lang=EN-US
style="mso-hansi-font-family: Times New Roman; mso-char-type: symbol; mso-symbol-font-family: Symbol; mso-ascii-font-family: 宋体">»</SPAN><SPAN
lang=EN-US style="mso-hansi-font-family: Times New Roman">
5.4即有些组的频道数为5个，有些为6个，见图3-3）。<O:P> </O:P></SPAN></FONT><FONT
face=楷体_GB2312><SPAN lang=EN-US
style="mso-hansi-font-family: Times New Roman"><O:P></O:P></SPAN></FONT><FONT
face=楷体_GB2312><SPAN lang=EN-US
style="mso-hansi-font-family: Times New Roman"><O:P></O:P></SPAN></FONT><SPAN
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -