An Adaptive Threshold Technique for Fast PN Code Acquisition in DS-SS Systems

This paper presents an efficient technique to considerably reduce pseudonoise (PN) code acquisition time by adjusting threshold values, depending on the pre-estimated correlation energy in direct-sequence spread spectrum (DS-SS) systems. The proposed technique utilizing a threshold generation mode (...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2011-07, Vol.60 (6), p.2870-2875
Main Authors: YEOM, Soonam, JUNG, Yunho, LEE, Seongjoo
Format: Article
Language:English
Subjects:
3G mobile communication
Acquisitions
Algorithm design and analysis
Algorithms
Applied sciences
Code division multiple access (CDMA)
Coding, codes
Correlation
Correlators
direct-sequence spread spectrum (DS-SS)
Exact sciences and technology
Hardware
Information, signal and communications theory
Marketing
Mathematical models
mean code acquisition time
Multiaccess communication
Searching
Signal and communications theory
Signal to noise ratio
Spread spectrum
Spreads
Studies
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
threshold generation mode (TM)
Thresholds
Transmission and modulation (techniques and equipments)
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Summary:This paper presents an efficient technique to considerably reduce pseudonoise (PN) code acquisition time by adjusting threshold values, depending on the pre-estimated correlation energy in direct-sequence spread spectrum (DS-SS) systems. The proposed technique utilizing a threshold generation mode (TM) prior to a search mode is employed to a conventional double-dwell serial-search algorithm, and the TM determines the threshold values of both search and verification modes, depending on its correlation energy. We present a mathematical model of the proposed scheme to analyze it with respect to the mean code acquisition time in synchronous code-division multiple-access (CDMA) systems such as Third-Generation Partnership Project 2 (3GPP2) under a Rayleigh-fading channel. Numerical results show that the proposed method can reduce the mean code acquisition time by more than 60% and compensate for the performance degradation in high signal-to-noise ratios (SNRs) with no increase in hardware costs, compared with the conventional algorithm that adopts a soft-decision technique.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2011.2158868