二階非均勻帶通采樣信號(hào)的快速恢復(fù)
SECOND-ORDER NONUNIFORM SAMPLING FOR THE FAST RECOVERY OF BANDPASS SIGNAL
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摘要: 本文討論了實(shí)帶通信號(hào)在二階非均勻采樣下的快速頻域搬移、恢復(fù),即用FFT方法將實(shí)帶通信號(hào)恢復(fù)到兩倍帶寬(2B)內(nèi)的復(fù)解析信號(hào),而幅度和相位保持不變,最后經(jīng)過(guò)簡(jiǎn)單的運(yùn)算,得到原始頻率。計(jì)算機(jī)模擬證實(shí)了上述方法。
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關(guān)鍵詞:
- 非均勻采樣; FFT; 內(nèi)插恢復(fù); 混疊; 頻率移動(dòng)
Abstract: Fast recovery and frequency-shifting of real bandpass signal based on second-order sampling is discussed. Using FFT and complex filtering, real bandpass signal can be recovered as a analytic signal whose central frequency is within two times of its bandwidth, and phase property is not changed. Finally, using simple computation, original frequency can be acquired. Computer simulation shows the correction of the method. -
Turletti T, Tennenhouse D. Estimating the computational requirements of a software GSM base station. Proc. IEEE 1997 International Conference on Communications, Montreal, Quebec, Canada: 1997, 169-175.[2]Vaughan R G, Scott N L, White D R. The theory of bandpass sampling. IEEE Trans. on SP, 1991, SP-39(9): 1973-1984.[3]Coulson A J. A generalization of nonuniform bandpass sampling. IEEE Trans. on SP, 1995, SP-43(3): 694-794.[4]Crochiere R E, Rabiner L R. Multirate Digital Signal Processing. Englewood Cliffs: Prentice-Hall Inc. 1983.[5]Coulson A J, Vaughan R G, Poletti M A. Frequency-shifting using bandpass sampling. IEEE Trans. on SP, 1994, SP-42(6): 1556-1559. -
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