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US 7,924,195 B2Granted
Hardware-efficient reconstruction for periodic non-uniformly sampled signals
AssigneeRobert Bosch GmbH
InventorsJohan Vanderhaegen, Christoph Lang, Frank Hofmann
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Abstract
Method and apparatus for signal reconstruction enabling the sharing of analog-to-digital converter resources among signals. Embodiments include a signal reconstruction method that allows reconstruction of multiple non-uniformly sampled signals while avoiding unwanted side effects such as aliasing.
Claims9
A method of sharing an analog-to-digital converter (ADC) between paths with different sampling rates in a wireless communication system, the method comprising:
- receiving a periodically non-uniformly sampled signal, wherein the sampled signal is considered in the time-domain signal and in the frequency-domain;
- dividing the signal in the time-domain in M periods of K length;
- dividing the signal in the frequency-domain in K groups of length M, wherein one in every K samples is missing for each sampling period and K is a Fast Fourier Transform (FFT) radix value, and further wherein at least one of the groups is zero and that the number of zero groups is larger than the number of missing time-domain samples per period;
- and
- applying a radix K FFT and radix K IFFT to reconstruct the signal.
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A signal reconstructing system including a reconstruction kernel configured to:
- receive a periodically non-uniformly sampled signal, wherein the sampled signal is considered in the time-domain signal and in the frequency-domain;
- divide the signal in the time-domain in M periods of K length;
- divide the signal in the frequency-domain in K groups of length M, wherein one in every K samples is missing for each sampling period and K is a Fast Fourier Transform (FFT) radix value, and further wherein at least one of the groups is zero and that the number of zero groups is larger than the number of missing time-domain samples per period;
- and
- apply a radix K FFT and radix K IFFT to reconstruct the signal.
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Dependencies are inferred from the claim text.