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The finite impulse response (FIR) digital filter for non-uniform time samples is investigated. By the upsampling technique this filter design is reduced to determining filter coefficients with many zeros. Only those coefficients that are not zeros correspond to time samples which are used to obtain the filtered output. Determining such a set of filter coefficients is exactly a best m-term approximation...
A pseudo-noise code regeneration method is proposed to break through the regeneration accuracy limit incurred by digital implementation. In this method, noncommensurate sampling is used to obtain subsample time-delay difference distinguishability, which is then employed to adjust the phase of the clock driving code regeneration using the dynamic fine phase shift capability of state-of-the-art FPGAs...
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