电信认证CDMA原理基础知识ppt课件

Course 809-Lesson 6-Second Carrier Deployment 1Issue 2.1(January 1998)第六课：第二载频实施第六课：第二载频实施 Course 809-Lesson 6-Second Carrier Deployment 2Issue 2.1(January 1998)明确NORTEL CDMA系统所采用的针对大话务量城市 区域在根本载频(f1)的根底之上实施辅助载频(第二载频 f2)覆盖的概念。Course 809-Lesson 6-Second Carrier Deployment 3Issue 2.1(January 1998)仅有一个载频覆盖的区域仅有一个载频覆盖的区域由于硬切换限制导致由于硬切换限制导致的覆盖区域的收缩的覆盖区域的收缩有两个载频覆盖的区域有两个载频覆盖的区域(高话务量高话务量)F1F1F2Course 809-Lesson 6-Second Carrier Deployment 4Issue 2.1(January 1998)ABC 六边形区域代表根本载频的覆盖区域，而圆形区域表示当在孤立小区 实施第二载频覆盖时，辅助载频的覆盖区域Course 809-Lesson 6-Second Carrier Deployment 5Issue 2.1(January 1998)ABCD 六边形表示根本载频的覆盖面积，而圆形区域表示第二载频的覆盖面积Course 809-Lesson 6-Second Carrier Deployment 6Issue 2.1(January 1998)第一第一CDMACDMA载频实施载频实施GuardBandCDMA spectrumGuardBandOther uses900 KHz900 KHz第二第二CDMACDMA载频实施载频实施-效率低效率低GuardBandGuardBandGuardBandGuardBandOther usesOther usesOther usesOther usesCDMA spectrumCDMA spectrum900 KHz900 KHz900 KHz900 KHz第二第二CDMACDMA载频实施载频实施-效率高效率高CDMA spectrumCDMA spectrumOther usesOther usesGuardBandGuardBand900 KHz900 KHz1250 KHzCourse 809-Lesson 6-Second Carrier Deployment 7Issue 2.1(January 1998)F1+F2RTDRTDRTDRTDRTDRTD边境边境扇区扇区边境边境扇区扇区空闲硬切换边境空闲硬切换边境硬切换边境硬切换边境F1F1F1Course 809-Lesson 6-Second Carrier Deployment 8Issue 2.1(January 1998)