冕仆吉劳氓四闪臂疙谱损吗骡
Chapter 0 Back ground and preview
第零章单元测验
1、单选题：
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 .
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 .
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 .
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 .
A: FDM
B: TDM
C: CDM
D: FDMA
答案: FDM;
TDM;
CDM
6、多选题：
A: transmitter
B: channel
C: receiver
D: source of imformation
答案: transmitter;
channel;
receiver
7、多选题：
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：
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：
A: 正确
B: 错误
答案: 错误
10、判断题：
A: 正确
B: 错误
答案: 正确
11、判断题：
A: 正确
B: 错误
答案: 正确
12、判断题：
A: 正确
B: 错误
答案: 错误
13、判断题：
A: 正确
B: 错误
答案: 错误
14、判断题：
A: 正确
B: 错误
答案: 错误
15、判断题：
A: 正确
B: 错误
答案: 错误
16、判断题：
A: 正确
B: 错误
答案: 正确
17、判断题：
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:
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：
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?
A: 
B: 
C: 
D: 
答案: ;;
4、判断题：
A: 正确
B: 错误
答案: 错误
5、判断题：
A: 正确
B: 错误
答案: 正确
6、判断题：
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).
A: 
B: 
C: 
D: 
答案: ;
2、多选题：
Considering the properties of the sine wave plus narrowband noise.
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：
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：
A: 
B: 
C: The power in X(t) is 4W.
D: The power in X(t) is 8W.
答案: ;
The
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