TD-SCDMA智能天线性能

aokewgz

<p>TD-SCDMA系统采用智能天线技术，可以将发射功率集中至小区内活动UE所在的位置，并在UE移动过程中全程监控。智能天线技术可以带来以下好处：</p><p>◆降低小区间干扰；</p><p>◆降低多径干扰的影响；</p><p>◆基站接收灵敏度增加9dB，故仍然可能使用低发射功率达到较远通信距离。在使用相同发射功率级别的手持机条件下，TD-SCDMA的通信距离比WCDMA要大。</p><p><input type="image" src="http://image.c114.net/07071304.jpg"/></p><p>4单元智能天线系统广播模式方向图</p><p>下面给出我们公司设计的应用于TD－SCDMA系统的4单元扇区天线阵HTZN18/209014。该天线的工作频段同时覆盖了TD－SCDMA的1880～1920MHz和2010～2025MHz两个工作频段。图4分别给出了两个频段上阵列的广播模式方向图，具体参数</p><p>如表1。在两个工作频段上波瓣宽度随频率变化误差仅为3.37％（1880～1920MHz）和3.06％（2010～2025MHz），远小于国标±10％。</p><p>表1 广播模式方向图参数</p><p><input type="image" src="http://image.c114.net/07071305.jpg"/></p><p>对于边射阵，波束扫描角度最大方向时副瓣最高，因此本文给出了工作波束扫描至扇区边缘45o时的方向图。图5给出了期望用户方向分别为45o、67o形成的工作波束。可以看到即使最大用户在扇区边缘时由于波束形成技术可提供的信干比仍可达到10.74dB。</p><p>图6分别模拟了系统给定一个期望用户，且有一个、两个或者三个强干扰用户情况下，在天线阵上可形成的方向图。可以看到通过调整阵列的单元激励权值，可以在天线阵上形成主波束对准期望用户，同时在强干扰用户方向形成零陷以抵消干扰用户对系统的干扰。在有一个或者两个强干扰用户情况下下，由于天线可以生成零陷达到-40dB以下。对于有三个强干扰用户情况下，由于单元数目限制，形成方向图零点数目少于干扰数目。但是所有零点的数值均小于－33dB，对干扰仍然具有很强的抑制作用。</p><p><input type="image" src="http://image.c114.net/07071306.jpg"/></p><p><input type="image" src="http://image.c114.net/07071307.jpg"/></p><p>调整权值使主波束对准期望用户方向</p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 17.6pt;"><span lang="EN-US" style="COLOR: black;"><a href="http://bbs.tong-xin.com/" target="_blank"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">文章出处</span></span><font face="Times New Roman">:</font></a><a href="http://bbs.tong-xin.com/" target="_blank"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">通信广角</span></span></a></span><span lang="EN-US" style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体;"><p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 17.6pt;"><span lang="EN-US" style="COLOR: black;"><a href="http://bbs.tong-xin.com/" target="_blank"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">参考资料</span></span><font face="Times New Roman">:</font></a><p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 17.6pt;"><span lang="EN-US" style="COLOR: black;"><a href="http://bbs.tong-xin.com/thread-2514-5-2.html" target="_blank"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">第三代移动通信系统原理篇</span></span></a><p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 17.6pt;"><span lang="EN-US" style="COLOR: black;"><a href="http://bbs.tong-xin.com/thread-1000-1-1.html" target="_blank"><span style="mso-spacerun: yes;"><font face="Times New Roman">&nbsp;</font></span><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">第三代移动通信系统原理篇</span></span></a><font face="Times New Roman"><span style="mso-spacerun: yes;">&nbsp; </span><p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 17.6pt;"><span lang="EN-US" style="COLOR: black;"><a href="http://bbs.tong-xin.com/thread-2479-1-2.html" target="_blank"><font face="Times New Roman">CDMA</font><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">数字移动通信系统的软切换技术</span></span></a><font face="Times New Roman">
                                <p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 17.6pt;"><span lang="EN-US" style="COLOR: black;"><a href="http://bbs.tong-xin.com/thread-63-1-5.html" target="_blank"><font face="Times New Roman">CDMA</font><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">及第三代移动通信系统专题讲座</span></span></a><font face="Times New Roman">
                                <p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 17.6pt;"><span lang="EN-US" style="COLOR: black;"><a href="http://bbs.tong-xin.com/thread-2435-1-2.html" target="_blank"><font face="Times New Roman">3G</font><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">无线基本原理培训</span></span></a><font face="Times New Roman">
                                <p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 17.6pt;"><span lang="EN-US" style="COLOR: black;"><a href="http://bbs.tong-xin.com/thread-317-1-4.html" target="_blank"><font face="Times New Roman">CDMA</font><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">通信经典讲义</span></span></a><font face="Times New Roman">
                                <p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 17.6pt;"><span lang="EN-US" style="COLOR: black;"><a href="http://bbs.tong-xin.com/thread-2462-1-2.html" target="_blank"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">第三代移动通信中上、下行链路业务量不等时频带资源的分配</span></span></a><font face="Times New Roman">
                                <p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 17.6pt;"><span lang="EN-US" style="COLOR: black;"><a href="http://bbs.tong-xin.com/thread-2171-1-3.html" target="_blank"><font face="Times New Roman">CDMA</font><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">无线</span></span><font face="Times New Roman">(RF)</font><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">网络规划</span></span></a><font face="Times New Roman">
                        </font></span><span lang="EN-US" style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体;"><p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 17.6pt;"><span lang="EN-US" style="COLOR: black;"><a href="http://bbs.tong-xin.com/thread-486-1-4.html" target="_blank"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">软件无线电<span lang="EN-US">技术在</span></span></span><font face="Times New Roman">3G</font><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">和</span></span><font face="Times New Roman">4G</font><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">中的应用</span></span></a><font face="Times New Roman">
                                <p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 17.6pt;"><span lang="EN-US" style="COLOR: black;"><a href="http://bbs.tong-xin.com/thread-81-1-4.html" target="_blank"><font face="Times New Roman">SCDMA</font><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;mso-hansi-font-family:&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><span lang="EN-US">的关键技术与无线接入技术的走势</span></span></a></span><span lang="EN-US" style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体;"><p></p></span></p><p><p><br/></p></p>