CDMA Theory_Nokia Technical Material_Chinese.pdf
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1、 诺基亚公司技术资料诺基亚公司技术资料 第第1页页/共共24页页 CDMA Technology Information CDMA 技术信息技术信息 CDMA Technology Information CDMA 技术信息技术信息 Author: 原著: John Danahy Translated by: 翻译:Cui Yuguang Checked by: 校对: Cheng Yan Change History: REV DATE AUTHOR DESC. OF CHANGE 0 11/08/1999 John Danahy Draft 1 08/22/2002 John Danahy
2、 CDMA2000 Update 2 Oct 4/2003 Cui Yuguang Start Translate to Chinese 3 Mar 8-11/2004 Cui Yuguang Complete translation 4 Mar 25/2004 Cheng Yan Start checking 5 Apr 05/2004 Cheng Yan Finish checking 6 Apr 06/2004 Cui Yuguang Final Check, Release * NOTE: It is the responsibility of the user of this doc
3、ument to insure it is the most current information available. This document is created and controlled by the Training Department for training purposes only. * 诺基亚公司技术资料诺基亚公司技术资料 第第2页页/共共24页页 CDMA Technology Information CDMA 技术信息技术信息 Contents: 目录目录 SECTION. PAGE 1.0 CDMA Standards History3 2.0 Revers
4、e/Forward Channels3 3.0 Cell Plan.5 3.1 Omni-directional Cell Sites.5 3.2 Sectored Cell Sites.6 4.0 AMPS and CDMA coexistence.6 5.0 Forward Channels6 5.1 Pilot Channels.6 5.1.2 Walsh Codes.8 5.2 Synchronization Channel9 5.3 Paging Channel10 5.4 Traffic Channel12 5.4.1 Forward Vocoder12 5.4.2 Forward
5、 Error Protection.12 5.4.3 Interleaving.12 5.4.4 Long Code Generation.13 5.4.5 Closed Loop Power13 5.4.6 Walsh code spreading.13 5.4.7 Short Code spreading14 6.0 Reverse Channels.14 6.1 Access Channel:.14 6.2 Traffic Channel15 6.2.1 Reverse Vocoder.15 6.2.2 CDMA Frames.16 6.2.3 Reverse Traffic Link.
6、19 6.2.4 Open Loop Power.19 6.2.5 Rake Receiver.19 7.0 HandOffs.20 7.1 Soft Handoff20 7.2 Hard Handoff21 8.0 Orthogonal Spreading22 9.0 Differences between IS200 and IS95B.23 诺基亚公司技术资料诺基亚公司技术资料 第第3页页/共共24页页 CDMA Technology Information CDMA 技术信息技术信息 1.0 CDMA Standards History CDMA 标准历史标准历史 May 1995 I
7、S95-A was introduced as the dual mode cellular band interim standard for CDMA. 1995 年 5 月 IS95A 成为 CDMA Cell 频段过渡标准。 June 1996 J-STD-008 was introduced as the CDMA PCS band interim standard. 1996 年 6 月 J-STD-008 被引入成为 PCS 频段过渡标准。 June 1997 IS95-B standard which combine the other two mentioned above
8、with higher voice data rates, also referenced as TSB74 1997 年 IS95-B 标准, 也称为 TSB74 结合了上述两种标准,同时提供了更高的话音编码速率,。 March 2000 CDMA 2000 introduced as the 3G replaces IS95B as new standard. 2000 年 3 月推出的 CDMA 2000 作为 3G 标准,取代了 IS95B 成为新的标准。 2.0 Reverse/Forward Channels 反向反向/前向信道前向信道 Reverse Link is from M
9、obile to Base Station and the forward link is from base station to mobile. 反向链路是从手机到基站,前向链路是从基站到手机。 All communication in the CDMA system takes place over a single 1.25 MHz frequency block. The maximum capacity for a CDMA cell is 42 users but typically about 20 subscribers share the same channel, sim
10、ultaneously. There are approximately 42 AMPS channels per CDMA channel. CDMA系统所有的通信都是在一个 1.25MHz 的频段内发生的。一个 CDMA 小区的理论最大容量是 42 个用 户,但是一般情况下,是 20 个用户同时共享同一个信道。在一个 CDMA 信道内大约可以容纳 42 个 AMPS 信道。 诺基亚公司技术资料诺基亚公司技术资料 第第4页页/共共24页页 CDMA Technology Information CDMA 技术信息技术信息 ch. 283 ch. 384 ch. 691 ch. 777 Cel
11、lular Band CDMA Channels Cell 频段 CDMA 信道 ch. 25 ch. 50 ch. 75ch. 1125ch. 1150 ch. 1175 BW 1.25 MHz 625 kHz PCS Band CDMA Channels PCS 频段 CDMA信道 Every channel is 50 kHz wide and CDMA channels are in multiples of 25 starting with Ch.25 ending at Ch.1175. 625 kHz BW 1.25 MHz 诺基亚公司技术资料诺基亚公司技术资料 第第5页页/共共
12、24页页 CDMA Technology Information CDMA 技术信息技术信息 3.0 Cell Plan: 小区规划小区规划 In the CDMA network adjacent cells can and do use the same frequencies. Shown in the diagram below. The reason that this is possible is because CDMA is designed to decode signals correctly in the presence of high levels of interf
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