# Where to find answers to principles of digital communications textbook

### Principles of Communication 2023 Chapter Test Answers

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Principles of Communication 2023 Chapter Test Answers_Principles of Communication Superstar Ergonomics Answers

1.5 Chapter Quiz

1, [Single Choice Questions] In an electrical communication system, the transfer of (…) is realized through (…).

A, message electrical signal

B, message information

C, electrical signal information

D, information message

2、【单选题】The probability of the occurrence of a symbol in a certain discrete source of information is 0.25, then the amount of information of this symbol is ()

A, 1

A. p>B,2

C,3

D,4

3,[Single Choice Question] Which of the following statements is false. ()

A,

B,

C,

D,

My Answer: in multinomial, PePb

4,[Single Choice Question] Which of the following equations is correct. ()

A,

B,

C,

D,

5. [Single-choice question] It is known that a certain digital transmission system transmits quadrature digital signals at a transmission rate of 1200 baud. If you keep the system transmission rate unchanged, the transmission rate of binary digital signal transmission rate is how much?

A,1200bit/s;1200 baud

B,1200bit/s;2400 baud

C,2400bit/s;2400 baud

D,2400bit/s;1200 baud

6、【One-Optional】Knowing that a certain binary system has a code rate of 2000 baud,what is the transmission rate of the system? If the code rate remains unchanged, the system transmits octal signals, what is the system’s transmission rate?

A, 2000bit/s;6000bit/s

B, 2000bit/s;3000bit/s

C, 2000bit/s;4000bit/s

D, 2000bit/s;8000bit/s

7、【Judgment Question】Analog communication system is a communication system that uses digital signals to deliver messages. ()

8. [Judgment question] Analog communication systems are more resistant to interference than digital communication systems. ()

9. [Judgment question] Analog/digital conversion is channel coding. ()

10. [Judgment question] There is no synchronization link in analog communication system. ()

11. [Judgment question] M-arithmetic

12. [Judgment question] The reliability of an analog communication system is measured in terms of the output signal-to-noise ratio of the system. ()

2.8 Chapter Quiz

1. [Single Choice Question] The envelope of a narrowband Gaussian noise obeys the () distribution, and the phase obeys the () distribution.

A, Rayleigh;Gaussian

B, Uniform;Normal

C, Rayleigh;Uniform

D, Generalized Rayleigh;Uniform

2、【Single-elective】The phase of a narrowband Gaussian noise obeys the () distribution, and the orthogonal components obey the () distribution.

A, Rayleigh;Gaussian

B, Uniform;Normal

C, Uniform;Rayleigh

D, Generalized Rayleigh;Uniform

3、【Multiple Choice】The following is correct about smooth stochastic processes ()

A, The statistical properties of generalized smooth stochastic processes do not change with the change with the passage of time.

B, The one-dimensional probability density function of a generalized smooth stochastic process is independent of the time starting point.

C. The generalized smooth stochastic process possesses isomorphic ephemerality.

D, A strictly smooth stochastic process must be generalized smooth.

4, [Multiple Choice] If the input to a linear system is a smooth stochastic process, the correct statement about the output stochastic process is ()

A. The mean of the output stochastic process is a constant.

B. The output process is also smooth.

C, The power spectral density of the output process is the power spectral density of the input process multiplied by the square of the mode value of the frequency response of the system.

D, If the input process of a linear system is Gaussian, then the output process of the system is also Gaussian.

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Related Knowledge Point 5: Principles of communication after-school exercises to solve the known spectral function of a model is Sa²(πfτ),find the energy of the signal (Hint: Use the time-domain expression of the signal to find)