Frequency measurement method based on delay chain;

A factorjzation algorithm for linear-phase paraunitary filter banks with optimized delay chains;

It collects output signals from the delay chain at the same time in order to enhance the randomness of the output sequence.

Modeling internet link delay based on measurement

By dealing with the raw giant data samples authorized by CAIDA,we obtain one-way link delay.

Furthermore,a research on the relationship between the traveling diameter and the traveling time from the whole and local data samples supposed that link delay was the leading cause for the great variance of the traveling time,and a revising algorithm was proposed to process the raw data samples to .

Traditional DLL design using only one layer of delay line faces the contradiction between the number of delay units and precision,resulting in huge amount of logic resource and chip area.

Experiments show that the proposed method has solved the problem of the traditional multi-phase sampling approach,to which phase shift resolution is decreased with the frequency increasing,so that the fine resolution can be obtained by limiting delay lines and no increase of counting clocks.