Title :
Effects of cell correlations in a matched-filter PN code acquisition for direct-sequence spread-spectrum systems
Author :
Sheen, Wern-Ho ; Tzeng, Jiun-Kai ; Tzou, Ching-Kae
Author_Institution :
Dept. of Electr. Eng., Nat. Chung-Cheng Univ., Taichung, Taiwan
fDate :
5/1/1999 12:00:00 AM
Abstract :
Rapid pseudonoise (PN) code acquisition with matched-filter correlators has been very popular in direct-sequence (DS) spread-spectrum systems. Conventionally, the analysis of this acquisition method is based on the assumption that the detections among cells are independent. However, there may be strong correlations among cell detections for the case that the cell size is less than a chip duration. In this paper, the mean acquisition time performance of the acquisition method is analyzed with the cell correlations being taken into account. Numerical results show that depending on the threshold value and other system parameters, the effect of cell correlations may be over 20% of the mean acquisition time for signal-to-noise ratios (SNR) of practical interest. The analytical results are substantiated by computer simulations
Keywords :
cellular radio; correlators; filtering theory; matched filters; noise; pseudonoise codes; spread spectrum communication; synchronisation; DS-SS; SNR; cell correlations; cell detection; cell size; chip duration; computer simulations; direct-sequence spread-spectrum systems; matched-filter PN code acquisition; matched-filter correlators; mean acquisition time performance; pseudonoise code acquisition; signal-to-noise ratios; system parameters; threshold value; Computer errors; Computer simulation; Correlators; Face detection; Matched filters; Performance analysis; Signal to noise ratio; Spread spectrum communication; Timing; Tracking loops;
Journal_Title :
Vehicular Technology, IEEE Transactions on
