Serial search acquisition system with adaptive threshold and opt

Details Serial search acquisition system with adaptive threshold and opt Serial search acquisition system with adaptive threshold and opt

1995-07-25

1997-06-24

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375206, 375367, H04B 1500, H04K 100, H04L 2730

Patent

active

056423772

ABSTRACT:
A PN code acquisition system for Code Division Multiple Access (CDMA) Direct Sequence Spread Spectrum (DSSS) systems, with automatic decision threshold, is based on the combination of the Maximum Likelihood (ML) and Serial Search (SS) acquisition approaches. In contrast to the conventional SS acquisition system, the disclosed system adaptively estimates optimal threshold by exploiting the statistics of the signal and noise, and makes an optimal decision based on the threshold. The system estimates the threshold by employing ML estimation and applies the threshold as in SS acquisition and makes a decision by comparing the updated threshold with the current signal strength. Together with post detection verification logic, this approach will increase detection probability and reduce false alarm probability significantly. An optimum system parameter design approach and the advantages of this approach as compared to conventional approaches (ML or SS acquisition) are demonstrated.

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"Double Dwell Maximum Likelihood Acquisition Systems With Continuous Decision Making For CDMA and Direct Spread".
"Multiple Dwell Serial Search: Performance And Application To Direct Sequence Code Acquisition", by D. DiCarlo and C. Weber, IEEE Trans. on Commun., pp. 650-659, May 1983.
"A Unified Approach To Serial Search Spread-Spectrum Code Acquisition. Part 1: General Theory," by A. Polydoros and C. Weber, IEEE Trans. on Commun., pp. 542-549, May 1984.

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