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
31
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
[originaltext](12)Youngwomenarelosingfaithintheuniversitysystemwit
[audioFiles]2018m6x/audio_ezfj_009_180622[/audioFiles]SunbedIntheUK,the
Theappealofadvertisingtobuyingmotivescanhavebothnegativeandposit
[originaltext]W:UAReservations.MayIhelpyou?M:I’dliketomakereservation
图示体系的自振频率(不计竖杆自重)为:
A. B.800 C.640 D.200π
学期结束时,班主任都会对学生思想品德的发展变化情况进行评价。这项工作属于()
Reynolds五联征常见于 A.急性胰腺炎B.急性胆囊炎C.急性胆管炎
Whatwillsomeonewhocontributes$400r
女,23岁,2个月前无明显诱因出现自言自语,有时独自发笑,有时对空谩骂,感觉被人
最新回复
(
0
)