| Summary: | 碩士 === 國立臺灣科技大學 === 資訊工程系 === 104 === Precise measurement is one of the essential requirement in the field of clock skew measurement. Yu-Chi Yang and Oka recently developed an improved Hough transform-based clock skew measurement method. This method is able to reach a ppm level precision estimation of clock skew with only few minutes of measurement, and it is robust in communications with lower outliers, which happens when the delay jitters are large. This research extends Yang’s method to address the case of offsets in bimodal distribution. In this research, we use Ostu’s algorithm to separate the offsets into two groups, then execute the rest of three steps process. Finally, we give the weight to compute the skew. This preprocessing prevents the region height from excessive increasing.
We compared our method with Yang’s method. The results of experiments show that the proposed method is able to provide more stable estimation in bimodal distribution when the number of primary peak is close to that of the second peak. In general, the proposed method spends 13.7% more than Yang’s method.
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