TDSCDMA和WCDMA的区别主要在哪里？

hiky

请高人指教！

nlxx

<P>TD的区别主要是时分双工方式,不需要对称频段.</P><P>在时隙和贞结构上差异较大</P>

wangl1014

<P>同意楼上的，虽然多址技术都是CDMA；但有很多不同：</P><P>最基本的是双工方式不同，</P><P>传输模式不同，WCDMA为异步传输（STM），TD是同步传输（ATM）。</P><P>带宽不同，WCDMA需要5M带宽，一上一下就要10M带宽；TD一个载波只需1.6M。呵呵~~从这个角度而言，TD更节约频率资源。</P><P>最大的最主要的不同是WCDMA是欧版的，TD是MADE IN CHINA 呵呵~~~</P>[em06][em06][em06][br]<p align=right><font color=red>+3 RD币</font></p>

卡妙

WCDMA中除了FDD模式也有TDD模式的

wangyongle

LS的说得很对，
我也刚刚开始入手，
希望各位前辈踊跃发言

willhunting

<DIV class=quote><B>以下是引用<I>卡妙</I>在2006-5-22 9:36:00的发言：</B>
WCDMA中除了FDD模式也有TDD模式的</DIV>



楼上说的TDD是SIMENS最先发起做的，后来放弃了，卖给华为了，成了鼎桥通信，中国大唐接着搞，换个名字叫TDSCDMA

yanglel

<P>楼上的意思是SIMENS不做了，可能性不大吧</P>

simbad_shi

<P>
TD-SCDMA——Time Division-Synchronous Code Division Multiple Access （时分同步的码分多址技术）是集CDMA、TDMA、FDMA、SDMA技术优势于一体、系统容量大、频谱利用率高、抗干扰能力强的移动通信技术。
它采用了智能天线、联合检测、接力切换、同步CDMA、软件无线电、低码片速率、多时隙、可变扩频系统、自适应功率调整等技术。   
TD-SCDMA 为 UTRA-FDD (W-CDMA) 的一个种替代方案；TD-SCDMA 提供了很多优势，诸如频谱分配灵活(1.6MHz)，频谱利用率高，成本低，有效地支持不对称的数据业务，简化终端设计等。</P><P> <TABLE dir=ltr height=297 cellSpacing=0 cellPadding=0 width=490><TR><TD black 1px solid; BORDER-TOP: black 2px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 2px solid; BORDER-BOTTOM: black 1px solid" width=172 height=27><DIV center; mso-line-spacing: '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">Feature</DIV></TD><TD black 1px solid; BORDER-TOP: black 2px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=162 height=27><DIV center; mso-line-spacing: '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">WCDMA</DIV></TD><TD black 2px solid; BORDER-TOP: black 2px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=158 height=27><DIV center; mso-line-spacing: '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">TD-SCDMA</DIV></TD></TR><TR><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 2px solid; BORDER-BOTTOM: black 1px solid" width=172 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">系统能力</DIV></TD><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=162 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">干扰受限</DIV></TD><TD black 2px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=158 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">资源受限</DIV></TD></TR><TR><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 2px solid; BORDER-BOTTOM: black 1px solid" width=172 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">模式</DIV></TD><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=162 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">FDD</DIV></TD><TD black 2px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=158 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">TDD</DIV></TD></TR><TR><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 2px solid; BORDER-BOTTOM: black 1px solid" width=172 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">带宽</DIV></TD><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=162 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">5MHz (上/下行)</DIV></TD><TD black 2px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=158 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">1.6MHz</DIV></TD></TR><TR><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 2px solid; BORDER-BOTTOM: black 1px solid" width=172 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">码片速率</DIV></TD><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=162 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">3.84Mcps</DIV></TD><TD black 2px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=158 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">1.28Mcps</DIV></TD></TR><TR><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 2px solid; BORDER-BOTTOM: black 1px solid" width=172 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">多路技术</DIV></TD><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=162 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">DS-CDMA</DIV></TD><TD black 2px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=158 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">DS-CDMA/TDMA</DIV></TD></TR><TR><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 2px solid; BORDER-BOTTOM: black 1px solid" width=172 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">调制技术</DIV></TD><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=162 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">QPSK</DIV></TD><TD black 2px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=158 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">QPSK, 8PSK</DIV></TD></TR><TR><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 2px solid; BORDER-BOTTOM: black 1px solid" width=172 height=35><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">同步</DIV></TD><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=162 height=35><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">给Node B提供时间参考</DIV></TD><TD black 2px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=158 height=35><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">Node B间同步; </DIV><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">上行精确同步</DIV></TD></TR><TR><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 2px solid; BORDER-BOTTOM: black 1px solid" width=172 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">智能天线/联合检测</DIV></TD><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=162 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">No</DIV></TD><TD black 2px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=158 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">Yes</DIV></TD></TR><TR><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 2px solid; BORDER-BOTTOM: black 1px solid" width=172 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">终端移动速度</DIV></TD><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=162 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">500km/h</DIV></TD><TD black 2px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid" width=158 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">120km/h</DIV></TD></TR><TR><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 2px solid; BORDER-BOTTOM: black 2px solid" width=172 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">小区半径</DIV></TD><TD black 1px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 2px solid" width=162 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">受限于发射功率</DIV></TD><TD black 2px solid; BORDER-TOP: black 1px solid; VERTICAL-ALIGN: top; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 2px solid" width=158 height=27><DIV '100 20 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1">10km</DIV></TD></TR></TABLE></P>

cavert

我举例解释第 4 楼 说的:
25.21X:wcdma fdd协议
25.22x:wcdma tdd协议