style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">它定義為頻譜擴展前的信息帶寬</SPAN><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 12pt; FONT-FAMILY: Symbol; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman; mso-char-type: symbol; mso-symbol-font-family: Symbol">D</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">F</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">與頻帶擴展后的信號帶寬</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">W</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">之比：</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt"><O:P> </O:P></SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%" 
            align=center><SPAN lang=EN-US style="FONT-SIZE: 12pt"><SPAN 
            style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;<B> 
            </B></SPAN><B>G</B></SPAN><B><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">W</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">／</SPAN><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 12pt; FONT-FAMILY: Symbol; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman; mso-char-type: symbol; mso-symbol-font-family: Symbol">D</SPAN></B><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt"><B>F<SPAN 
            style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; 
            </SPAN></B><O:P></O:P></SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在擴頻通信系統中．接收機作擴頻解調后，只提取偽隨機編碼相關處理后的帶寬為</SPAN><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 12pt; FONT-FAMILY: Symbol; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman; mso-char-type: symbol; mso-symbol-font-family: Symbol">D</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">F </SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的信息，而排除掉寬頻帶</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">W</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中的外部干擾、噪音和其地用戶的通信影響。因此，處理增益</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">G</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">反映了擴頻通信系統信噪比改善的程度。</SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt"><O:P></O:P></SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><IMG 
            height=11 src="s02.files/sliver-cirm.gif" width=11> <B><FONT 
            color=#ff6633 size=2>抗干擾容限</FONT></B></SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是指擴頻通信系統能在多大干擾環境下正常工作的能力，定義為：</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt"> <O:P></O:P></SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%" 
            align=center><B><SPAN lang=EN-US style="FONT-SIZE: 12pt">Mj = G 
            </SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">－</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt"> [(S/N)out + Ls]<O:P> 
            </O:P></SPAN></B></P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%" 
            align=center><B><SPAN lang=EN-US 
            style="FONT-SIZE: 12pt"><O:P></O:P></SPAN></B></P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">其中：</SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">Mj --- </SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">抗干擾容</SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">G --- </SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">處理增益</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt"><O:P> </O:P></SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">(S</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">／</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">N)out --- </SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">信息數據被正確解調而要求的最小輸出信噪比</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt"><O:P> </O:P></SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">Ls --- </SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">接收系統的工作損耗</SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%">　</P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt"><O:P></O:P></SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 12pt; mso-spacerun: yes">&nbsp;</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><FONT 
            face=宋體 color=#008080>例如</FONT></SPAN><FONT face=宋體 
            color=#008080><SPAN lang=EN-US style="FONT-SIZE: 12pt">, 
            </SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一個擴頻系統的處理增益為</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">35dB</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．要求誤碼率小于</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">l0</SPAN><SUP><SPAN 
            class=unnamed4 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">－</SPAN><SPAN 
            class=unnamed4 lang=EN-US 
            style="FONT-SIZE: 12pt">5</SPAN></SUP><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的信息數據解調的最小的輸出信噪比</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">(S/N)out </SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＜</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">10 dB</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，系統損耗</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">Ls</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">3dB</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，則干擾容限</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">Mj </SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">35 </SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">－</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt"> (10 +3) </SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt"> 22dB<O:P> 
            </O:P></SPAN></FONT></P>
            <P class=MsoNormal 
            style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><FONT 
            face=宋體 color=#008080><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">這說明，該系統能在干擾輸入功率電平比擴頻信號功率電平高</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">22dB</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的范圍內正常工作，也就是該系統能夠在接收輸入信噪比大于或等于－</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt">22dB</SPAN><SPAN 
            style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的環境下正常工作。</SPAN><SPAN 
            lang=EN-US style="FONT-SIZE: 12pt"><SPAN 
            style="mso-spacerun: yes">&nbsp;</SPAN></SPAN></FONT></P></TD>
          <TD width="5%">　</TD></TR></TBODY></TABLE>
      <P>　</P>
      <P>　</P></DIV></TD></TR>
  <TR>
    <TD bgColor=#ccffff>
      <DIV align=center><B><a href="main.htm">目錄</a> 
      &nbsp;&nbsp;<a href="s01.htm">上一頁</a> 
      &nbsp;&nbsp;<a href="s03.htm">下一頁</a></B></DIV></TD></TR></TBODY></TABLE><!-- #EndEditable -->
<P align=center><!-- #BeginLibraryItem "/Library/close.lbi" --><A 
href="javascript:window.close();">關閉窗口</A><!-- #EndLibraryItem --></P>
<TABLE width="100%" border=0>
  <TBODY>
  <TR>
    <TD>
      <DIV align=center><FONT size=2><!-- #BeginLibraryItem "/Library/copyright.lbi" --><FONT 
      size=2>版權所有：移動通信國家工程研究中心 
      2000-2001&copy;</FONT><!-- #EndLibraryItem --></FONT></DIV></TD></TR>
  <TR>
    <TD>
      <DIV align=center><FONT size=2></FONT><FONT size=2><!-- #BeginLibraryItem "/Library/tel.lbi" --><FONT 
      size=2>tel:020-84227969</FONT><!-- #EndLibraryItem -->&nbsp;<!-- #BeginLibraryItem "/Library/email.lbi" --><FONT 
      size=2><A 
      href="mailto:mc21stmaster@163.net">mailto:mc21stmaster@163.net</A></FONT><!-- #EndLibraryItem --></FONT></DIV></TD></TR></TBODY></TABLE>
<P>　</P><!-- #EndTemplate --></BODY></HTML>