首页
登录
从业资格
CDMA for cellular systems can be describ
CDMA for cellular systems can be describ
考试题库
2022-08-02
70
问题
CDMA for cellular systems can be described as follows. As with FDMA, each cell is Allocated a frequency ( ),which is split into two parts; half for reverse (mobile unit to base station) and half for( )(base station to mobile unit). For full-duplex( ), a mobile unit uses both reverse and forward channels. Transmission is in the form of direct-sequence spread( )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( )chipping codes to multiple users, so that the receiver can recover the transmission of an individual unit from multiple transmissions.问题1选项A.waveB.signalC.bandwidthD.domain问题2选项A.forwardB.reverseC.backwardD.ahead问题3选项A.connectionB.transmissionC.compromiseD.communication问题4选项A.structureB.spectrumC.streamD.strategy问题5选项A.concurrentB.orthogonalC.higherD.lower
选项
答案
CADBB
解析
用于蜂窝系统的CDMA技术可以描述如下。就像FDMA一样,每一个小区被分配了一个频带,该 频带划分为两半,一半用于反向信道(从移动终端到基站),一半用于正向信道(从基站到移动终端)。在全双工通信中,移动终端使用了反向和正向两个信道。传输以直接序列扩频方式进行,用一个码片来增加传输的数据速率,同时也产生了额外的信号带宽。通过把正交的各个码片指定给不同的用户就可以实现多路访问,这样接收者就能够从多个传输中提取并恢复需要的传输单元。
转载请注明原文地址:https://tihaiku.com/congyezige/2405472.html
本试题收录于:
中级 网络工程师题库软件水平考试初中高级分类
中级 网络工程师
软件水平考试初中高级
相关试题推荐
Insoftwareengineeringandsystemsengi
CDMAforcellularsystemscanbedescrib
CDMAforcellularsystemscanbedescrib
CDMAforcellularsystemscanbedescrib
CDMAforcellularsystemscanbedescrib
CDMAforcellularsystemscanbedescrib
CDMAforcellularsystemscanbedescrib
CDMAforcellularsystemscanbedescrib
Thetraditionalmodelforsystemsdevelo
Thepurposeofsystemsanalysisphaseis
随机试题
ChineselanguageisusuallyspokenbyHannationalityandmanyoverseasChinese.
Forwhomisthemessagemostlikelyintended?[br][originaltext]Goodafternoon
Eacheducationalsystemisnotperfectinastrictsense,whichhasitsown_____
【B1】[br]【B8】[audioFiles]audio_eusm_j01_028(20099)[/audioFiles]schedule空格所在句中的
Britainmaynotalwayscheck【C1】______properly,butitissadlygoodaterec
钢铁厂向银行贷款,当地公立医院()担任保证人。A.可以 B.不可以 C
某车间从3月2日开始每天调入1人,已知每人每天生产一件产品,该车间从3月1日至3
假设某段时间内房地产业的预期收益率为15%,国债的投资收益率为10%,市场整体的
中国史学界提出“层累地造成的中国古史”观点的学者是()。A.王国维 B.顾颉
全站仪主要是用于( )的测量。A.纵向中心线 B.水平距离 C.偏差 D
最新回复
(
0
)