📄 期中复习.htm
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<p align="center"><font color="#FFFFFF" size="6"><b>期中复习</b></font>
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<td width="100%" height="48"><span style="font-family: 宋体; mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical"><b><font size="6" color="#FFFFFF">1、节点间的数据交换方式。</font></b></span></td>
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<td width="100%" height="47"><b><font size="6" color="#FFFFFF">2、通信双方的数据交换方式。</font></b></td>
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<p style="line-height: 150%"><b><font size="6" color="#FFFFFF">3、信道的主要性能参数以及有关计算公式。</font></b></p>
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<p style="line-height: 150%"><b><font size="6" color="#FFFFFF"><span style="font-family: 宋体; mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical">奈奎斯特公式：</span><span style="font-family:宋体;
mso-fareast-font-family:宋体;mso-hansi-font-family:"Times New Roman";layout-flow:
vertical">（无噪声信道最大数据传输速率）</span></font></b>
<p style="line-height: 150%"><b><font size="6" color="#FFFFFF"><span lang="EN-US" style="mso-fareast-font-family:
宋体;mso-hansi-font-family:"Times New Roman";layout-flow:vertical;mso-fareast-language:
ZH-CN">S=2Wlog</span><span lang="EN-US" style="mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical; position: relative; top: .37em; mso-text-raise: -25%; mso-fareast-language: ZH-CN">2</span><span lang="EN-US" style="mso-fareast-font-family:宋体;mso-hansi-font-family:"Times New Roman";
layout-flow:vertical;mso-fareast-language:ZH-CN">M<span style="mso-spacerun: yes"> </span></span></font></b></p>
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<p style="line-height: 150%"><b><font size="6" color="#FFFFFF"><span style="font-family:宋体;mso-fareast-font-family:
宋体;mso-hansi-font-family:"Times New Roman";layout-flow:vertical">香农公式：（有噪声干扰情况）</span><span style="mso-fareast-font-family:宋体;mso-hansi-font-family:
"Times New Roman";layout-flow:vertical"><span style="mso-spacerun: yes">
</span></span></font></b>
<p style="line-height: 150%"><b><font size="6" color="#FFFFFF"><span style="mso-fareast-font-family:宋体;mso-hansi-font-family:
"Times New Roman";layout-flow:vertical">S=Wlog</span><span lang="EN-US" style="mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical; position: relative; top: .37em; mso-text-raise: -25%; mso-fareast-language: ZH-CN">2</span><span lang="EN-US" style="mso-fareast-font-family:
宋体;mso-hansi-font-family:"Times New Roman";layout-flow:vertical;mso-fareast-language:
ZH-CN">(1+S/N)<span style="mso-spacerun: yes"> </span></span></font></b></p>
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<p style="line-height: 150%"><b><span style="mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical"><font size="6" color="#FF0000">10*log</font></span><font size="6" color="#FF0000"><span lang="EN-US" style="mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical; position: relative; top: .37em; mso-text-raise: -25%; mso-fareast-language: ZH-CN">10</span><span lang="EN-US" style="mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical; mso-fareast-language: ZH-CN">(S/N)=[信噪比]分贝</span></font></b>
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<p style="line-height: 150%"><b><font size="6" color="#FFFFFF">4、模拟信号的数字编码技术----PCM</font></b></p>
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<p style="line-height: 250%"><b><font size="6" color="#FFFFFF"><span style="mso-special-format: bullet; position: absolute; left: -3.54%; layout-flow: vertical">•</span><span style="font-family: 宋体; mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical">采样定律：若对连续变化的模拟信号进行周期性采样</span><span style="mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical">,</span><span style="font-family: 宋体; mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical">只要采样频率等于或高于信号最高频率的两倍，则采样值就包含了原始信号的全部信息。</span></font></b>
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<p style="line-height: 150%"><b><font size="6" color="#FFFFFF"><span style="mso-special-format: bullet; position: absolute; left: -4.15%; layout-flow: vertical">•</span><span lang="EN-US" style="mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical; mso-fareast-language: ZH-CN">F
>= 2F</span><span lang="EN-US" style="mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical; position: relative; top: .37em; mso-text-raise: -25%; mso-fareast-language: ZH-CN">max</span></font></b>
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<p style="line-height: 150%"><b><font size="6" color="#FFFFFF"><span style="mso-special-format: bullet; position: absolute; left: -3.91%; layout-flow: vertical">•</span><span lang="EN-US" style="mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical; mso-fareast-language: ZH-CN">PCM</span><span style="font-family: 宋体; mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical">的三个基本步骤：采样、量化、编码</span></font></b>
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<p><b><font size="6" color="#FFFFFF">5、数字数据信号的编码技术</font></b></p>
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<span style="font-family: 宋体; mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical"><b><font size="6" color="#FFFFFF">曼彻斯特编码：前（1/2）T
原码，后（1/2）T 反码。</font></b></span>
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<b><font size="6" color="#FFFFFF"><span style="font-family: 宋体; mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical">差分曼彻斯特编码：0：起始有跳变</span><span style="mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical"></span><span style="font-family: 宋体; mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical">；1：起始无跳变</span>。</font></b>
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<b><font size="6" color="#FFFFFF"><span style="mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical">(</span><span style="font-family: 宋体; mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical">这两种编码</span><span style="mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical">,</span><span style="font-family: 宋体; mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical">具有自同步能力</span><span style="mso-fareast-font-family: 宋体; mso-hansi-font-family: Times New Roman; layout-flow: vertical">.)</span></font></b>
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