基帶采樣率內(nèi)任意帶通信號的正交采樣
A NEW QUADRATURE SAMPLING APPROACH FOR ARBITRARY BANDPASS SIGNAL WITHIN BASEBAND SAMPLING RATE
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摘要: 提出了一種在基帶采樣率內(nèi)對任意帶通信號的正交采樣技術(shù)。載頻位于ADC(模/數(shù)轉(zhuǎn)換器)基帶采樣率內(nèi)的任意帶通信號,經(jīng)1/2抽取和(-1)n調(diào)制,再由全通線性多相濾波器內(nèi)插后,得到其復(fù)包絡(luò)的調(diào)制輸出XI(n)和XQ(n)。
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關(guān)鍵詞:
- 帶通信號; 正交采樣; 復(fù)包絡(luò); 多相濾波器組
Abstract: A new quadrature sampling technique for arbitrary bandpass signal within baseband sampling rate is presented. The input bandpass signal whose carrier frequency lies in the A/D baseband sampling rate is first decimated by factor 2 and modulated by (-1)n, and then is interpolated by a linear phase FIR all-pass filter, finally the modulated complex envelope of bandpass signal can be produced. -
Rice D W, Wu K H. Bandpass signal sampling and coherent detection. IEEE Trans. on AES, 1982, AES-18(4):731-739.[2]Rader C M. A supple method for sampling in-phase and quadrature component. IEEE Trans. on AES, 1984, AES-20(6): 821-824.[3]Liu H L, Ghafoor A, et al. A new quadrature sampling and processing approach. IEEE Trans. on AES, 1989, AES-25(5): 733-747.[4] Pellon L E. A double Nyquist digital product detector for quadrature sampling. IEEE Trans. on Signal Processing, 1992, SP-40(7): 1670-1681.[4]Pyfer M F, Ansari R. The design and application of optimal FIR fractional phase filters. Proc .of ICASSP, Dallas, Texas, USA. 1987: 896-899. -
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