Filter Optimzation for Pulse Timing Detector.

In the pulse transmission system such as pulse- position modulation (PPM), where the linear filter for pulse-timing detection is optimized and the construction of the detector is considered, one of the essential problems is the timing error contained in the timing information extracted from the received pulse. Several papers have been reported on the linear filters which are claimed to be useful in correcting the error, but the extent of improvement has not been analyzed clearly. This paper compares those filters from the viewpoint of the mean-square timing error and indicates the effectiveness of the filters on the relative basis. In addition, a new suboptimal filter is proposed and compared. Methods for filter optimization and timing detector construction are presented and compared from various viewpoints, such as the easiness of realization. The calculation of the timing error produced by the filter is calculated easily using the result shown in this paper, where the expression is normalized by the pulse-width. It is shown that the proposed suboptimal filter gives an excellent performance compared to the filters proposed in the past. Assuming the pulse transmission using the optical fiber, the calculation is shown based on the white and f² additive noise as well as the Gaussian signal pulse. [ABSTRACT FROM AUTHOR]