《通信原理与技术》期末考试卷1

《通信原理与技术》期末考试卷1
《通信原理与技术》期末考试卷1

《通信原理与技术》期末试卷 1

题号一二三四五六总分得分

一、判断题(每小题 1 分,共10 分)

3、通断键控信号(OOK )的带宽是基带脉冲波形带宽的倍。

4、光纤线芯的折射率(小于、等于、大于)包层的折射率。

5、我国采用TDM的PCM30/32路制式基群帧结构中,共由32 路信号组成,其中路是用来传输

话音信号的,路是勤务控制信号。

四、简答题(每小题 5 分,共30 分)

班级

学号

姓名

命题

审核

批准

;.'

1、光纤是利用光的全反射作用来引导光线进行传输的。()

2、半双工通信是指通信双方都能同时收发信息。()

3、量化器工作在过载(饱和)区时的量化误差是大于△的一个定值。()

4、信道容量就是信道的最小信息传输速率。()

5、通信系统的收发端之间要保持“同步”实际上就是收发“同时”。()

二、选择题(每小题 2 分,共20 分)

1、按消息传递的方向与时间关系,通信方式可分为单工、半双工和()三种。

A. 全双工

B.单方向

C.分时双向

D. 分时单向

2、无线电波在不均匀介质中传播时传播方向会发生改变,下列不属于该现象()。

A. 折射

B.绕射

C.照射

D. 散射

3、某二进制数字信源的每个码元持续时间为0.005 秒,则该信号的码元传输速率为()波特。

A. 200

B. 0.005

C.1000

D.500

4、载波同步是指相干解调时收发两端调制与解调所用载波()。

A. 幅度相同

B.频率相同

C.相位相同

D. 同频同相位

5、若信码0、1 等概出现,码元传输速率为为100 波特,则30 秒内传送的信息量为()比特。

A.100

B.3000

C.30

D.6000

6、短波,中波,长波这三种电磁波,频率最大的是()。

A. 短波

B.中波

C.长波

D. 三者一样

7、8 进制数等概出现,每一个码元所携带的信息量是()比特。

A.1

B.2

C.3

D.4

8、在AM 、DSB 、SSB、VSB 几种模拟信号中,可以采用包络检波的是()。

A.AM 信号

B.DSB 信号

C.SSB 信号

D.VSB 信号

9、下列属于线性调制的是()。

A. 相移键控;

B.频移键控;

C.振幅键控;

D.角度调制

10、PCM 调制是()。

A. 双边带调制

B.移相调制

C.脉冲编码调制

D.增量调制

三、填空题(每空 1 分,共10 分)

1、一个连续信道的信道容量受、、的限制,只要这 3 要素确定,则信道

容量也就随之确定。

2、北美多路载波电话系统采用分层结构,每路电路复用为 1 个基群,每个基群复用为

1 个超群,每个超群复用为 1 个主群。

1、为避免出现包络失真,对语音信号进行AM 调制时,调制指数m a 的取值对调幅波信号的包络有何

影响?

2、为什么光纤通信系统的抗电磁干扰能力比电通信系统要强很多?

3、语音信号要通过PCM30/32路制式的语音通信系统进行传输时,语音信号要经过哪三个步骤才能转化

为PCM 数字信号?

4、光通信的三要素?

5、什么是“倒π现象”?为什么二进制移相键控信号会出现“倒π现象”?

A-2-1

6、已知二进制数字信号每个码元占有的时间为1ms,1、0 码等概率出现,求码元的传输速率? 4 秒钟内传输的信息量?

五、作图题(每小题 5 分,共10 分)

1、某低通信号的频谱图1所示,画出AM信号的频谱。(载波频率为ωc,且ωc>ω0)。

图1 低通信号的频谱

2、数字幅度调制系统要发送的数字基带信号与调制载波波形如图 2 所示,请画出2ASK 信号的波形图。

图2 数字信号、载波信号波形图

六、分析计算题(1、3 小题 6 分,2 小题8 分,共20 分)

1、若8 进制ASK 系统的信息传输速率为6000bps,试求该系统的码元传输速率和带宽。

2、带宽为4KHz 的单路语音信号,对其进行PCM 传输,求:

(1)求对其抽样时的最低抽样频率?

(2)若按照最低抽样频率抽样后进行16 级量化与编码,求PCM 系统的信息传输速率?

3、话音信号抽样速率为fs=8kHz ,对于PCM30/32 路系统,若抽样后均匀量化级数为N=256,同步信

号已包含在编码内,问每帧宽度为多少?路时隙为多少?信息传输速率为多少?

A-2-2

;.'

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