무선통신개론 2판, 28 ~ 32p 정리 NeoStudio_20241201_233714_산업계측제어 기술사13다운로드 https://youtu.be/FcXZ28BX-xE?feature=shared https://en.wikipedia.org/wiki/Nyquist%E2%80%93Shannon_sampling_theorem https://en.wikipedia.org/wiki/Discrete-time_Fourier_transform#Relation_to_Fourier_Transform https://www.ti.com/video/5527868103001#tab-1 https://jaeseolee3754.tistory.com/34 https://youtu.be/lgJ5KLLZvgc?feature=shared