📄 s02.htm
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style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">式中：</SPAN></P>
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lang=EN-US style="FONT-SIZE: 12pt">Pow<SUB>j</SUB> --- </SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">差错概率</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><O:P> </O:P></SPAN></P>
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lang=EN-US style="FONT-SIZE: 12pt">E --- </SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">信号能量</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><O:P> </O:P></SPAN></P>
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lang=EN-US style="FONT-SIZE: 12pt">N</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">--- </SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">噪声功率谱密度</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><O:P> </O:P></SPAN></P>
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style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">因为，</SPAN></P>
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style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">信号功率</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><SPAN
style="mso-spacerun: yes"> </SPAN>P</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">E</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">／</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">T<SPAN
style="mso-spacerun: yes"> </SPAN>(T</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为信息持续时间</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">)<O:P> </O:P></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 12pt; mso-spacerun: yes"> </SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">噪声功率</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><SPAN
style="mso-spacerun: yes"> </SPAN>N</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">WN</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><SPAN
style="mso-spacerun: yes"> </SPAN>(W</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为信号频带宽度</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">)<O:P> </O:P></SPAN></P>
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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"> </SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">信息带宽</SPAN><SPAN
style="FONT-SIZE: 12pt"> </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: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">l</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">／</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">T<O:P> </O:P></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 12pt; mso-spacerun: yes"> </SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">则式</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">(3)</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">可化为：</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><O:P> </O:P></SPAN></P>
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style="mso-spacerun: yes"> <B>
</B></SPAN><B>Pow<SUB>j</SUB><SPAN style="mso-spacerun: yes">
</SPAN></B></SPAN><B><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">»</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"> f(TW.P/N) = f(P/N.W/</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"> ......
</SPAN>(4)</B></SPAN></P>
<P class=MsoNormal
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align=center><SPAN lang=EN-US
style="FONT-SIZE: 12pt"><O:P></O:P></SPAN></P>
<P class=MsoNormal
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lang=EN-US
style="FONT-SIZE: 12pt; mso-spacerun: yes"> </SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">式</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">(4)</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">说明，对于一定带宽</SPAN><SPAN
style="FONT-SIZE: 12pt"> </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: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的信息而言，用</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">Gp</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">值较大的宽带信号来传输，可以提高通信抗干扰能力，保证强干扰条件下，</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; mso-spacerun: yes">
</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">通信的安全可靠。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt; mso-spacerun: yes">
</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">亦即式</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">(4)</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与式</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">(2)</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一样，说明信噪比和带宽是可以互换的。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><O:P> </O:P></SPAN></P>
<P class=MsoNormal
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lang=EN-US
style="FONT-SIZE: 12pt; mso-spacerun: yes"> </SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">总之，我们用信息带宽的</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">100</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">倍，甚至</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">1000</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">倍以上的宽带信号来传输信息，就是为了提高通信的抗干扰能力，即在强干扰条件下保证可靠安全地通信。这就是扩展频谱通信的基本思想和理论依据。</SPAN></P>
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color=#800080 size=4><B><SPAN lang=EN-US><A
name="2.3 扩频通信的主要性能指标">2.3<SPAN style="mso-spacerun: yes">
</SPAN></A></SPAN><A name="2.3 扩频通信的主要性能指标"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">扩频通信的主要性能指标</SPAN></A></B></FONT><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><O:P> </O:P></SPAN></P>
<P class=MsoNormal
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style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处理增益和抗干扰容限是扩频通信系统的两个重要性能指标。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><O:P> </O:P></SPAN></P>
<P class=MsoNormal
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style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; 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><FONT
color=#0080c0><B> <FONT color=#ff6633
size=2>处理增益</FONT></B></FONT></SPAN><FONT color=#ff6633
size=2><B><SPAN lang=EN-US style="FONT-SIZE: 12pt">G</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">也称扩频增益</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">(Spreading Gain)</SPAN></B><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><O:P> </O:P></SPAN></FONT><FONT
size=2><SPAN lang=EN-US
style="FONT-SIZE: 12pt"><O:P></O:P></SPAN></FONT></P>
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