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<TD borderColor=#6699ff><FONT
size=2>您的位置：技术园地>技术讲座-GSM蜂窝移动通信系统 </FONT></TD></TR>
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<DIV align=center><FONT size=4><B><FONT color=#333399>第一讲</FONT><FONT
color=#ffffcc> <SPAN lang=EN-US
style="FONT-SIZE: 15pt; COLOR: #333399; mso-bidi-font-size: 10.0pt">GSM</SPAN><SPAN
style="FONT-SIZE: 15pt; COLOR: #333399; mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">数字移动通信发展史</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 15pt; COLOR: #333399; mso-bidi-font-size: 10.0pt"><O:P>
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<P class=MsoNormal
style="TEXT-JUSTIFY: inter-ideograph; TEXT-INDENT: 21.15pt; TEXT-ALIGN: justify; mso-char-indent-count: 2.0; mso-char-indent-size: 10.3pt"><B><SPAN
lang=EN-US><A name=b1>1.1<SPAN style="mso-spacerun: yes">
</SPAN>GSM</A></SPAN><A name=b1><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">系统历史背景</SPAN><SPAN
lang=EN-US><O:P> </SPAN></A><SPAN lang=EN-US></O:P></SPAN></B></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"><SPAN
lang=EN-US><FONT face=楷体_GB2312 color=#000066>GSM</FONT></SPAN><FONT
face=楷体_GB2312 color=#000066><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">数字移动通信系统是由欧洲主要电信运营者和制造厂家组成的标准化<BR>委员会设计出来的，它是在蜂窝系统的基础上发展而成。</SPAN></FONT><SPAN
lang=EN-US><O:P> </O:P></SPAN></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"><SPAN
lang=EN-US> </SPAN><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><FONT
face=楷体_GB2312
color=#000066>蜂窝系统的概念和理论二十世纪六十年代就由美国贝尔实验室等单位提了出来，但其复杂的控制系统，尤其是实现移动台的控制直到七十年代随着半导体技术的成熟，大规模集成电路器件和微处理器技术的发展以及表面贴装工艺的广泛应用，才为蜂窝移动通信的实现提供了技术基础。直到</FONT></SPAN><FONT
face=楷体_GB2312 color=#000066><SPAN lang=EN-US>1979</SPAN><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">年美国在芝加哥开通了第一个</SPAN><SPAN
lang=EN-US>AMPS(</SPAN><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">先进的移动电话业务</SPAN><SPAN
lang=EN-US>)</SPAN><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">模拟蜂窝系统，而北欧也于</SPAN><SPAN
lang=EN-US>1981</SPAN><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">年</SPAN><SPAN
lang=EN-US>9</SPAN><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">月在瑞典开通了</SPAN><SPAN
lang=EN-US>NMT(Nordic </SPAN><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">移动电话</SPAN><SPAN
lang=EN-US>)</SPAN><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">系统，接着欧洲先后在英国开通</SPAN><SPAN
lang=EN-US>TACS</SPAN><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">系统，德国开通</SPAN><SPAN
lang=EN-US>C</SPAN><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">－</SPAN><SPAN
lang=EN-US>450</SPAN><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">系统等。见表</SPAN><SPAN
lang=EN-US>1-1</SPAN><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">。</SPAN><SPAN
lang=EN-US> </SPAN></FONT><FONT color=#000066><SPAN
lang=EN-US><O:P> </O:P></SPAN></FONT></P>
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align=center><FONT color=#000066><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><FONT
face=楷体_GB2312>表</FONT></SPAN><FONT face=楷体_GB2312><SPAN
lang=EN-US>1-1<SPAN style="mso-spacerun: yes">
</SPAN>1991</SPAN><SPAN
style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">年欧洲主要蜂窝系统</SPAN></FONT></FONT></P>
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