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这2天在看Bandpass SDM，在IF 采样时需要考虑的一些问题，希望有帮助！
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
[ 本帖最后由 iaman 于 2008-4-22 14:45 编辑 ] |
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发表于 2008-4-22 14:44:55
