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起止时间:2020-12-09到2021-03-01
更新状态:已完结
Chapter 0 Back ground and preview Chapter 0 Unit Quiz
1、 
A:正确
B:错误
答案: 错误
2、 
A:正确
B:错误
答案: 正确
3、 
A:正确
B:错误
答案: 错误
4、 
A:正确
B:错误
答案: 错误
5、 
A:正确
B:错误
答案: 错误
6、 
A:正确
B:错误
答案: 错误
Chapter 1 Random processes Chapter 1 Unit Quiz 1
1、 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、 
A:
B:
C:
D:
答案:
3、 Which one of the following functions can be the autocorrelation function of a random process?
A:
B:
C:
D:
答案: ;
;
4、 
A:正确
B:错误
答案: 错误
5、 
A:正确
B:错误
答案: 正确
6、 
A:正确
B:错误
答案: 错误
Chapter 1 Random processes Chapter 1 Unit Quiz 2
1、 
A:正确
B:错误
答案: 错误
2、 
A:正确
B:错误
答案: 正确
3、 We have proved that when the input to an LTI system is stationary, the output is also stationary. If we know that the output process is stationary, can we conclude that the input process is necessarily stationary?
A:正确
B:错误
答案: 错误
4、 The process X (t) is defned by X(t) = X, where X is a randomvariable unifrmly distrbutedon [- 1, 1] , the autocorelation function and the power spectral density are: Rx(τ) = 1/3，Sx(f) = 1/3
A:正确
B:错误
答案: 错误
5、 Two random processes X(t) and Y(t) arejointly wide-sense stationar, then the cross-corelation RXY(t1, t2) depends ony on r = t1 – t2
A:正确
B:错误
答案: 正确
6、 Assume that Z(t) = X(t) + Y(t), where X(t) and Y(t) are jointly stationaryrandom processes，then Sz(f) = Sx(f) + Sy(f)
A:正确
B:错误
答案: 错误
Chapter 1 Random processes & Chapter 2 Continuous-wave modulation Chapter 1 Test
1、 Considering the properties of the autocorrelation function Rx(τ) of a random process X(t).
A:
B:
C:
D:
答案: ;
2、 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、 
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、 
A:
B:
C:The power in X(t) is 4W.
D:The power in X(t) is 8W.
答案: ;
The power in X(t) is 4W.
5、 
A:正确
B:错误
答案: 正确
6、 
A:正确
B:错误
答案: 错误
7、 
A:正确
B:错误
答案: 错误
8、 Thermal noise is a stationary, zero-mean Gaussian process.
A:正确
B:错误
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