大学MOOC Principles of Communication(Southeast University)1458227171 最新慕课完整章节测试答案
Chapter 0 Back ground and preview
文章目录
Chapter 0 Unit Quiz
1、判断题：
选项：
A: 正确
B: 错误
答案: 【 错误】
2、判断题：
选项：
A: 正确
B: 错误
答案: 【 正确】
3、判断题：
选项：
A: 正确
B: 错误
答案: 【 错误】
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: 【 错误】
6、判断题：
选项：
A: 正确
B: 错误
答案: 【 错误】
Chapter 1 Random processes
Chapter 1 Unit Quiz 2
1、判断题：
选项：
A: 正确
B: 错误
答案: 【 错误】
2、判断题：
选项：
A: 正确
B: 错误
答案: 【 正确】
3、判断题：
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?
选项：
A: 正确
B: 错误
答案: 【 错误】
4、判断题：
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
选项：
A: 正确
B: 错误
答案: 【 错误】
5、判断题：
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
选项：
A: 正确
B: 错误
答案: 【 正确】
6、判断题：
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)
选项：
A: 正确
B: 错误
答案: 【 错误】
Chapter 1 Random processes & Chapter 2 Continuous-wave modulation
Chapter 1 Test
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 power in X(t) is 4W.】
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】
7、判断题：