Pseudo-Noise Code Synchronizer Using Extended Kalman Filter and Modified Delay Lock Loop

摘要

The present invention relates to a pseudo noise (PN) code synchronizer using an extended Kalman filter and a modified delay-locked loop (DLL) of a reliable band system for packet wireless data communication in a multiple access environment. Parallel matching filter acquisition means (10) for performing a phase acquisition process within one chip to increase tracking performance in the appearing frequency selective fading transmission path; Control means for outputting a correlation signal generation control signal and a converted phase value for phase difference control; Pseudo noise (PN) code generating means (12) for generating a half-chip fast correlation signal and a half-chip late correlation signal in accordance with a correlation signal generation control signal; First mixing means (13) for mixing and outputting the captured signal and the half-chip late correlation signal; Second mixing means 14 for mixing and outputting the captured signal and the half-chip fast correlation signal; First integrating means (15) for integrating and outputting a signal input from said first mixing means (13); Second integrating means (16) for integrating and outputting a sinhol input from the second integrating means (14) for integrating and outputting the signal input from the second mixing means (14); Adding means (17) for adding and outputting signals input from said first and second integrating means (15, 16); Rake receiving means (18) for outputting a signal of said adding means (17) by adjusting a frequency phase under the control of said control means (11); And extended Kalman filtering means 19 for filtering the signal input from the rake receiving means 18 and outputting a pseudo noise (PN) code synchronizing signal to increase the tracking performance of the spread spectrum synchronization system. It is possible to reduce the number of users per unit time, thereby enabling efficient communication, and the present invention can be applied to a reverse link synchronization system of a code division multiple access (CDMA) system.