https://scholars.lib.ntu.edu.tw/handle/123456789/147528
標題: | Reducing sampling error by prolate spheroidal wave functions and fractional Fourier transform | 作者: | JIAN-JIUN DING SOO-CHANG PEI |
公開日期: | 2005 | 卷: | IV | 起(迄)頁: | IV217-IV220 | 來源出版物: | ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings | 摘要: | It is known that one can use Shannon's theory to sample a band-limited signal. In this paper, we introduce how to use prolate spheroidal wave functions (PSWFs) to sample a time-limited and nearly band-limited signal. PSWFs have the property of optimal energy concentration. Thus we can apply it for sampling theory to reduce the aliasing error of the recovered signal. We derive the theory that can estimate the upper bound of the error. With it, we can determine that, to achieve certain accuracy, how many samples we should acquire. Moreover, we combine the proposed sampling theory with the fractional Fourier transform (FRFT). We also find an important theory, i.e., to achieve a certain degree of accuracy, the number of sampling points required for a signal is proportional to the 'area' of its time-frequency distribution. © 2005 IEEE. |
URI: | http://scholars.lib.ntu.edu.tw/handle/123456789/317593 http://ntur.lib.ntu.edu.tw/bitstream/246246/200704191001471/1/01415984.pdf https://www.scopus.com/inward/record.uri?eid=2-s2.0-33646809794&doi=10.1109%2fICASSP.2005.1415984&partnerID=40&md5=e98bae42d82b1020cfcfcb8e0e81f861 |
ISSN: | 15206149 | DOI: | 10.1109/icassp.2005.1415984 | SDG/關鍵字: | Boundary conditions; Error correction; Estimation; Fourier transforms; Sampling; Band-limited signal; Prolate spheroidal wave functions (PSWF); Sampling theory; Shannon's theory; Signal processing |
顯示於: | 電機工程學系 |
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01415984.pdf | 236.71 kB | Adobe PDF | 檢視/開啟 |
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