What does "83 1 Communication and Signal System" mean in the communication and information system course of University of Electronic Science and Technology of China (Chengdu)?

83 1 written test of communication and signal system (closed book)

180 minutes 150 minutes

I. General requirements

Candidates are required to master the basic concepts, theories and analysis methods of continuous and discrete signals and systems; Understand the basic methods of establishing signal and system mathematical model, signal analysis, solving system output and system performance in time domain and transform domain. Master basic concepts and basic operations, and be able to use them flexibly. Candidates are required to master the basic principles and performance analysis methods of digital and analog communication.

Second, the content and proportion

Communication principle accounts for 30%, and signal system accounts for 70%.

Oppenheim's Signals and Systems (Second Edition) was published by Xi Jiaotong University Press.

Digital and Analog Communication System (7th Edition) is published by Electronic Industry Press.

1, deeply understand the basic principle of analog signal modulation and demodulation. Familiar with the calculation method of signal characteristics and related parameters of analog linear amplitude modulation (including amplitude modulation, DSB and single sideband) and the calculation method of anti-noise performance signal-to-noise ratio of amplitude modulation system. Deeply understand the characteristics, modulation/demodulation methods and related calculation methods of analog angle modulation FM and PM signals.

2. Deeply understand the waveform generation and basic characteristics of digital baseband signals. Proficient in power calculation of digital signals and power spectrum calculation of digital signals with the same waveform. Familiar with binary signal receiving method and error code analysis. Deeply understand intersymbol crosstalk and Nyquist criterion, and master the judgment method and design method of intersymbol crosstalk-free system. Deeply understand the basic principles of some corresponding systems. Familiar with the calculation method of precoding and related coding.

3. Deeply understand the basic characteristics of digital band modulation signals (including 2ASK, 2FSK, 2PSK and 2PSK, QPSK and DQPSK), be familiar with their spectrum and bandwidth calculation, and be familiar with relevant differential coding and decoding calculation methods. Familiar with coherent demodulation method and error rate calculation of binary digital modulation signal.

4. Deeply understand the basic principle and realization method of analog signal digitization and the principle of PCM system. Familiar with the sampling theorem and calculation method of analog signals. Deeply understand the basic principle of quantization and master the analysis method of signal quantization noise and quantization signal-to-noise ratio. Deeply understand the basic realization methods of quantization and coding, and master the A-law 13 polyline and logarithmic coding methods. Familiar with the calculation method of PCM system parameters.

5. Deeply understand the basic principle of QAM system, master the signal constellation, and quantitatively calculate the relevant signal parameters.

6. Deeply understand the basic principle and signal generation method of minimum frequency domain keying MSK signal.

(ii) Signals and systems:

1. Master the classification, basic operation and singular function properties of common continuous-time and discrete-time signals, and understand the properties of continuous-time and discrete-time systems.

2. Master the time domain analysis method of linear time-invariant system. Master the basic operations of convolution integral and convolution summation.

3. Deeply understand the Fourier series decomposition of continuous time periodic signals and its physical significance; Master the Fourier series properties of continuous time periodic signals and the calculation method of LTI system response to complex exponential signals.

4. Deeply understand the physical meaning of continuous-time and discrete-time Fourier transform; Familiar with the method of solving Fourier transform (including inverse transform) by using the basic properties of Fourier transform flexibly from the basic transform pairs; Correctly understand the related concepts such as frequency response and filtering, and be familiar with various filters; Master the basic theory of signal amplitude modulation and sampling, and deeply understand the sampling theorem.

Chapter 9: Laplace transform

5. Master the S-domain analysis method of continuous-time LTI system. Accurately understand the definition of bilateral Laplace transform, the concept of convergence domain and the relationship between Fourier transform and Laplace transform; Master the method of solving Laplace transform (including inverse transform) by flexibly using the basic properties of Laplace transform from the basic transform pairs; Deeply understand the expression of system function H(s) of continuous-time LTI system on the basic characteristics of the system; Using bilateral or unilateral Laplace transform skillfully to solve the response of the system (including specific circuits); Master the block diagram representation of continuous-time LTI system, the transformation between system functions and the description of linear constant coefficient differential equations.

6. Familiar with the Z-domain analysis method of discrete-time LTI system. Accurately understand the definition of bilateral Z-transform, the concept of convergence domain and the relationship between discrete-time Fourier transform and Z-transform; Grasp the method of solving Z transform (including inverse transform) by using the basic properties of Z transform flexibly from the basic transform pairs; Deeply understand the representation of system function H(z) of discrete-time LTI system to the basic characteristics of the system; Skillfully use bilateral or unilateral Z transform to solve the response of the system; Familiar with the block diagram representation of discrete-time LTI system, the transformation between system functions and the description of linear constant coefficient difference equation.

Third, the question type and score

The topics are calculation, proof, short answer, drawing, etc.