混叠 Resources

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2. Regarding the Doppler spectrum of wireless channels, please answer the following questions: (1) In certain wireless channels, Doppler frequency shift can cause aliasing in the output signal. Describe the various causes of aliasing; (2) There exists a classic spectrum in wireless channel Doppler spectra. Explain the mechanism behind this spectral shape; (3) Write code using Simulink tools (via S-Function approach) to generate a single-path Rayleigh channel with a classic Doppler spectrum shape, where the mobile speed is 120 km/h. Additionally, answer: Possible methods to verify the correctness of the computer-generated classic spectrum.

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(1) In certain wireless channels, Doppler shift can cause aliasing in the output signals. This document analyzes various causes of aliasing and explains the mechanism behind the classic Doppler spectrum. (2) The implementation details include creating a single-path Rayleigh channel with Simulink using S-Function, configured for 120 km/h velocity with classic Doppler spectrum. (3) Validation methods using spectral analysis tools and theoretical comparisons are discussed to verify the generated spectrum's correctness.

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Given a signal x(t), sampling it to obtain x(n), will spectral aliasing occur? This project uses FFT to analyze its spectrum. The implementation involves: 1. Programming to plot the signal waveform; 2. Performing FFT on x(n) with N=16 and plotting the magnitude-frequency characteristic curve; 3. Performing FFT on x(n) with N=1024 and plotting the magnitude-frequency characteristic curve; 4. Analyzing the results from steps 2 and 3. The design debug report requires: working principle summary, design approach, challenges and solutions, results analysis, and program code with operational steps.

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