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Design of the Optimal Phase for the Interpolant Filter in the Second-order Bandpass Sampling System
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 Title & Authors
Design of the Optimal Phase for the Interpolant Filter in the Second-order Bandpass Sampling System
Baek, Jein;
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 Abstract
In the bandpass sampling(BPS), the sampling frequency for the analog-to-digital converter is lower than that of the signal to be sampled. Since the BPS operation results in the signal spectrum to be copied on the baseband, it is possible for the frequency down-converter to be conveniently omitted. The second-order BPS system is introduced in order to cancel the aliased interference components from the BPS output that may be generated by the BPS processing. In this paper, we introduce a design method for the optimal phase of the interpolant filter in the second-order BPS system which enables to maximally cancel the aliased components. Being mathematically derived, this method can always be applied independently to the spectral characteristics of the BPS input signal. The performance improvements by the suggested method has been measured statistically with various power spectra of the received signal, and it has been shown that the maximal amount of the improvements reaches up to 5~20 [dB] in comparison with the previous suboptimal algorithm.
 Keywords
bandpass sampling;subsampling;second-order BPS;interpolant filter;
 Language
Korean
 Cited by
 References
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