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? 3 ? FFT ??????

? 3 ? FFT ??????

? 3 ? FFT ??????. 3.1 ?? 3.2 ???? DFT ????????? 3.3 ?????? DIT ??? 2-FFT ?? 3.4 ?????? DIF ??? 2-FFT ?? 3.5 N ????? FFT ?? 3.6 ???? Z ??? Chirp-Z ????? 3.7 ?? FFT ?????????? 3.8 FFT ?????. 3.2 ???? DFT ?????????. 3.2.1 ???? DFT ??????. ??????????????? 1/N.

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1.26k views • 111 slides
1.DFT ????????????????? 2.1965 ?? Cooley, Tukey? ?????????????? ?

1.DFT ????????????????? 2.1965 ?? Cooley, Tukey? ?????????????? ?

??. 1.DFT ????????????????? 2.1965 ?? Cooley, Tukey? ?????????????? ? 3. ???????? DFT ???????? 1 ? 2 ???? 4. ??????? 2FFT ???. ? 4 ?????. 1. ????????? -2FFT ??????????????????????? 2. ????????? -2FFT ??????????????????????? 3. ?? IFFT ??. ? 4 ? ??????? (FFT). 4.1 ?? 4.2 ? 2FFT ??

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1.38k views • 100 slides
??? ?--2?????? FFT ??D ecimation-in-Frequency(DIF) (Sander-Tukey)

??? ?--2?????? FFT ??D ecimation-in-Frequency(DIF) (Sander-Tukey)

??? ?--2?????? FFT ??D ecimation-in-Frequency(DIF) (Sander-Tukey). ??????. ????????N=2 M (M?????????????????X(k)(??M????????????????????????????2??????FFT??????Sander-Tukey???. ?????? 1.??. DFT ???. ?????? X(k) ?k????????????x(n)?n??????????????x(n)?n????????? : ?????x(n),0 ? n?N/2-1 ;

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976 views • 80 slides
2.4 ?? FFT ???????? 1 ? IDFT ?????

2.4 ?? FFT ???????? 1 ? IDFT ?????

2.4 ?? FFT ???????? 1 ? IDFT ????? ?? FFT ????????????????? (Inverse Discrete Fourier Transform ??? IDFT) ??? DFT ? IDFT ??????. ? DIT?IFFT ????. ? DIT?IFFT ???? ( ???? ). ???????? FFT ????? IFFT ?????????? ??. ????????????. 2 ?????? FFT

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841 views • 35 slides
Comm Final Project Proposal 802.11a Physical Layer

Comm Final Project Proposal 802.11a Physical Layer

Comm Final Project Proposal 802.11a Physical Layer. ??? ??? B93902016 ??? ??? B93901154 ??? ??? B93902076 ???. 802.11a Physical Layer Structure. Modulation. OFDM transmit infomation by modulated signal and always use M-PSK, M-QAM. M-PSK modulation M-QAM. 802.11a Modulation Mode.

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121 views • 11 slides

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