- Article

Tarczynski, A. and Allay, N. 2004. Spectral analysis of randomly sampled signals: suppression of aliasing and sampler jitter. *IEEE Transactions on Signal Processing.* 52 (12), pp. 3324-3334. doi:10.1109/TSP.2004.837436

Title | Spectral analysis of randomly sampled signals: suppression of aliasing and sampler jitter |
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Authors | Tarczynski, A. and Allay, N. |

Abstract | Nonuniform sampling can facilitate digital alias-free signal processing (DASP), i.e., digital signal processing that is not affected by aliasing. This paper presents two DASP approaches for spectrum estimation of continuous-time signals. The proposed algorithms, named the weighted sample (WS) and weighted probability (WP) density functions, respectively, utilize random sampling to suppress aliasing. Both methods produce unbiased estimators of the signal spectrum. To achieve this effect, the computational procedure for each method has been suitably matched with the probability density function characterising the pseudorandom generators of the sampling instants. Both proposed methods are analyzed, and the qualities of the estimators they produce have been compared with each other. Although none of the proposed spectrum estimators is universally better than the other one, it has been shown that in practical cases, the WP estimator produces generally smaller errors than those obtained from WS estimation. A practical limitation of the approaches caused by the sampling-instant jitter is also studied. It has been proven that in the presence of jitter, the theoretically infinite bandwidths of WS and WP signal analyses are limited. The maximum frequency up to which these analyses can be performed is inversely proportional to the size of the jitter. |

Keywords | Alias-free estimation, Fourier transform, nonuniform sampling, sampling methods, spectral analysis |

Journal | IEEE Transactions on Signal Processing |

Journal citation | 52 (12), pp. 3324-3334 |

ISSN | 1053-587X |

Year | Dec 2004 |

Digital Object Identifier (DOI) | doi:10.1109/TSP.2004.837436 |

Publication dates | |

Published | Dec 2004 |

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