FFT Realization of OMOAM Signals
| Autor: | Jin-Hua Wang, 王錦華 |
|---|---|
| Rok vydání: | 2003 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 91 A digital realization of a novel modulation family called orthogonally multiplexed orthogonally amplitude-modulated (OMOAM) signals [10] is investigated in this thesis. Even if can be constructed by different time-limited basis sets, OMOAM signals can be represented by data-amplitude-modulated subcarriers which have equal frequency spacing and are orthogonal to each other. This result is analogous with the modulation scheme of the orthogonal frequency-division multiplexing. Therefore, the inverse discrete Fourier transform is applied to process digital baseband modulation and can be implemented by the IFFT algorithm to reduce computational complexity. Realized as mention above, OMOAM feeds many zero-valued data into IFFT in some cases when not all of the bases are chosen. Consequently, a checking mechanism can be involved in the radix-2 FFT algorithm to reduce computational complexity more. The amount of reduced complexity is discussed when OMOAM signals are constructed in different basis sets with different parameters. And the performance trend related to each parameter is inferred. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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