THE THEORY OF BANDPASS SAMPLING
THE THEORY OF BANDPASS SAMPLING
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DOI：
10.1109/78.134430
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发表时间：
1991-09-01
影响因子：
5.4
通讯作者：
WHITE, DR
中科院分区：
文献类型：
--
作者：
VAUGHAN, RG;SCOTT, NL;WHITE, DR
带通信号的采样讨论相对于频带位置，噪声的考虑，和参数的灵敏度。对于一阶抽样，给出了可接受和不可接受的抽样率，并对非最小的实际抽样率进行了讨论。最小采样率是病态的，因为实现中的任何缺陷都会导致混叠。可接受的采样率对混叠的敏感性随着保护带大小从最小采样率开始的增加而降低。在应用带通采样将信号重新定位到基带位置时，由于带外噪声被混叠，信噪比不能保持。信噪比的降低是通过带通信号的位置来量化的。对于从二阶样本构造带通信号，实现插值的成本（动态范围和长度）取决于Kohlenberg的采样因子k，即均匀采样流之间的相对延迟。不允许的离散值k的详细说明表明，一些允许的值比其他更好的实施。k的最佳值对应于正交采样值，其中频带被定位为整数或半整数。
The sampling of bandpass signals is discussed with respect to band position, noise considerations, and parameter sensitivity. For first-order sampling, the acceptable and unacceptable sample rates are presented, with specific discussion of the practical rates which are nonminimum. The minimum sampling rate is pathological in that any imperfection in the implementation will cause aliasing. The susceptibility of the acceptable sampling rates to aliasing decreases with increasing guardband size from the minimum sampling rate.In applying bandpass sampling to relocate signals to a baseband position, the signal-to-noise ratio is not preserved owing to the out-of-band noise being aliased. The degradation in signal-to-noise ratio is quantified in terms of the position of the bandpass signal.For the construction of a bandpass signal from second-order samples, the cost of implementing the interpolant (dynamic range and length) depends on Kohlenberg's sampling factor k, the relative delay between the uniform sampling streams. An elaboration on the disallowed discrete values of k shows that some allowed values are better than others for implementation. Optimum values of k correspond to the quadrature sampling values with the band being either integer or half-integer positioned.