From special analogous crystal filters to digital impacting filters

The implementation of high-speed and high-efficiency wireless communications, or Ultra Narrow Band (UNB) modulation, depends on the design of a special digital filter, which needs to not only maintain or even enlarge the minute differences in modulated waveforms, but also weaken noise or interferenc...

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Bibliographic Details
Published in:Digital signal processing 2012-07, Vol.22 (4), p.690-696
Main Authors: Feng, Man, Wu, Lenan, Gao, Peng
Format: Article
Language:English
Subjects:
Crystal filter
Crystal filters
Digital
Digital filters
Digital impacting filter
Extended Binary Phase Shift Keying (EBPSK)
Frequency response
Group delay
High speed
Modulation
Noise
Ultra Narrow Band (UNB)
Waveforms
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Summary:The implementation of high-speed and high-efficiency wireless communications, or Ultra Narrow Band (UNB) modulation, depends on the design of a special digital filter, which needs to not only maintain or even enlarge the minute differences in modulated waveforms, but also weaken noise or interference. This paper proposes a novel but simple digital impacting filter produced by exploiting the mechanism of zero group delay crystal filters. The proposed filter can cooperate with the usual small-angle modulation of UNB modulation, especially with Extended Binary Phase Shift Keying (EBPSK) modulation, which can convert the signal characteristics in noise into high-amplitude impacting at the phase jump points, such that the UNB signal is easy to detect. A computer simulation illustrates the validity of the proposed filter.
ISSN:1051-2004
1095-4333
DOI:10.1016/j.dsp.2012.02.011