CDMA for cellular systems can be described as follows．As with FDMA，each cell is allocated a frequency (71)，which is split into

admin2019-05-15 71

问题 CDMA for cellular systems can be described as follows．As with FDMA，each cell is allocated a frequency (71)，which is split into two parts，half for reverse(mobile unit to base station)and half for (72) (base station to mobile uni0．For full—duplex (73) ，a mobile unit uses both reverse and forward channels．Transmission is in the form of direct—sequence spread (74)，which uses a chipping code to increase the data rate of the transmission，resulting in an increased signal bandwidth．Multiple access is provided by assigning (75) chipping codes to multiple users，SO that the receiver can recover the transmission of an individual unit from multiple transmissions．
(72)

选项 A、forward
B、reverse
C、backward
D、ahead

答案A

解析

转载请注明原文地址:https://kaotiyun.com/show/2FDZ777K

本试题收录于：网络工程师上午基础知识考试题库软考中级分类

网络工程师上午基础知识考试

软考中级

相关试题推荐

随机试题

最新回复(0)

CDMA for cellular systems can be described as follows．As with FDMA，each cell is allocated a frequency (71)，which is split into

网络工程师上午基础知识考试

软考中级

ItshouldgowithoutsayingthatthefocusofUMLismodeling.However,whatthatmeans,exactly,canbeanopen-endedquestion．

销售部的网络号是(1)，广播地址是(2)：技术部的网络号是(3)，广播地址是(4)；每个子网可用的IP地址有(5)个。在网关计算机/etc/sysconfig/network-scripts/目录中有以下文件，运行某命令可以启动网络，该命令是(9)，其

PPP(Point-to-PointProtocol)是SLIP(SerialLineIPprotocol)的继承者，它提供了跨过同步和异步电路实现路由器到路由器(router-to-router)和主机到网络(host-to-network)的连

Bluetoothisauniversalradiointerfaceinthe(71)frequencyhandthatenablesportableelectronicdevicestoconnectandcommun

Bluetoothisauniversalradiointerfaceinthe(71)frequencyhandthatenablesportableelectronicdevicestoconnectandcommun