Abstract: In order to seek a new processor the detective ability of which is stronger than match filter,we must resort to the field of time-variant and high-order processor.APSE is the extension of ALE.ALEcan only effectively detect CW signal and APSE can enhance any periodic signals effectively.Throughsimulational research,we conclude that this processor has lower detective threshold than match filter.We have found a new processor the detective ability of which is better than match filter in both the ideal and multipath channel.