基带采样率内任意带通信号的正交采样
A NEW QUADRATURE SAMPLING APPROACH FOR ARBITRARY BANDPASS SIGNAL WITHIN BASEBAND SAMPLING RATE
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摘要: 提出了一种在基带采样率内对任意带通信号的正交采样技术。载频位于ADC(模/数转换器)基带采样率内的任意带通信号,经1/2抽取和(-1)n调制,再由全通线性多相滤波器内插后,得到其复包络的调制输出XI(n)和XQ(n)。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.
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