MOOC 通信原理(东南大学)1001752356 最新慕课完整章节测试答案
Chapter 0 Back ground and preview
文章目录
第零章单元测验
1、单选题:
选项:
A: a continuous rectangular pulses
B: a periodic sequence of rectangular pulses
C: a continuous sinusoidal signal
D: a periodic sinusoidal signal
答案: 【 a periodic sequence of rectangular pulses】
2、单选题:
The reverse of modulation is .
选项:
A: encoding
B: demodulation
C: decoding
D: modulator
答案: 【 demodulation】
3、单选题:
A common problem with electromagnetic wave propagation via sky wave in thehigh fequency (HF) range is .
选项:
A: Wide transmission bandwidth
B: signal multipath
C: Linear time-varying channel
D: Broad-area coverage
答案: 【 signal multipath】
4、多选题:
Two primary resources employed in communication systems are and .
选项:
A: power
B: bandwidth
C: frequency
D: source of Information
答案: 【 power;
bandwidth 】
5、多选题:
The three commonly used method of multiplexing are , and .
选项:
A: FDM
B: TDM
C: CDM
D: FDMA
答案: 【 FDM;
TDM;
CDM】
6、多选题:
选项:
A: transmitter
B: channel
C: receiver
D: source of imformation
答案: 【 transmitter;
channel;
receiver】
7、多选题:
选项:
A: coaxial cable
B: telephone channel
C: universal Serial Bus
D: optical fiber
答案: 【 coaxial cable;
telephone channel;
optical fiber】
8、多选题:
选项:
A: wireless broadcast channel
B: underwater acoustic channel
C: satellite channel
D: mobile radio channel
答案: 【 wireless broadcast channel;
satellite channel;
mobile radio channel】
9、判断题:
选项:
A: 正确
B: 错误
答案: 【 错误】
10、判断题:
选项:
A: 正确
B: 错误
答案: 【 正确】
11、判断题:
选项:
A: 正确
B: 错误
答案: 【 正确】
12、判断题:
选项:
A: 正确
B: 错误
答案: 【 错误】
13、判断题:
选项:
A: 正确
B: 错误
答案: 【 错误】
14、判断题:
选项:
A: 正确
B: 错误
答案: 【 错误】
15、判断题:
选项:
A: 正确
B: 错误
答案: 【 错误】
16、判断题:
选项:
A: 正确
B: 错误
答案: 【 正确】
17、判断题:
选项:
A: 正确
B: 错误
答案: 【 错误】
18、填空题:
答案: 【 transmitter, channel, receiver】
19、填空题:
答案: 【 broadcasting, point-to-point communication】
20、填空题:
答案: 【 transmitted power, channel bandwidth】
21、填空题:
答案: 【 a sinusoidal wave】
22、填空题:
答案: 【 a periodic sequence of rectangular pulses】
23、填空题:
答案: 【 the average signal power, the average noise power】
24、填空题:
答案: 【 band-limited】
Chapter 1 Random processes
第一章单元测验-1
1、单选题:
This random process X (t) =cos(2πfct). the frequencies can be 100, 200, . . . , 600 Hz,then:
选项:
A: The possible values of X (0.001) could be cos(0.2π), cos(0.4π), . . . , cos(l .2π),and each has a probability 1/6.
B: The possible values of X (0.001) could be cos(0.1π), cos(0.2π), . . . , cos(0.6π), and each has a probability 1/6.
C: The possible values of X (0.001) could be cos(0.2π), cos(0.4π), . . . , cos(l .2π)
D: The possible values of X (0.001) could be cos(0.1π), cos(0.2π), . . . , cos(0.6π)
答案: 【 The possible values of X (0.001) could be cos(0.2π), cos(0.4π), . . . , cos(l .2π) 】
2、单选题:
选项:
A:
B:
C:
D:
答案: 【 】
3、多选题:
Which one of the following functions can be the autocorrelation function of a random process?
选项:
A:
B:
C:
D:
答案: 【 ;
;
】
4、判断题:
选项:
A: 正确
B: 错误
答案: 【 错误】
5、判断题:
选项:
A: 正确
B: 错误
答案: 【 正确】
6、判断题:
选项:
A: 正确
B: 错误
答案: 【 错误】
第一章测试
1、多选题:
Considering the properties of the autocorrelation function Rx(τ) of a random process X(t).
选项:
A:
B:
C:
D:
答案: 【
;
】
2、多选题:
Considering the properties of the sine wave plus narrowband noise.
选项:
A: If the narrowband noise is Gaussian, the in-phase and quadrature components are jointly Gaussian.
B: Both the in-phase and quadrature component have the same variance.
C: Both the in-phase and quadrature component have the same mean.
D: The envelope and phase components are statistically independent.
答案: 【 If the narrowband noise is Gaussian, the in-phase and quadrature components are jointly Gaussian.;
Both the in-phase and quadrature component have the same variance. 】
3、多选题:
选项:
A: The mean of Y is 0.
B:
C:
D: Y is also Gaussian
答案: 【 The mean of Y is 0.;
;
;
Y is also Gaussian】
4、多选题:
选项:
A:
B:
C: The power in X(t) is 4W.
D: The power in X(t) is 8W.
答案: 【 ;
The