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Performance analysis for an adaptive filter code-tracking technique in direct-sequence spread-spectrum systems
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DOI：10.1109/26.705406.png)
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This paper investigates tracking of direct-sequence spread-spectrum (DS/SS) signals based on an adaptive filtering technique, It is shown that a recently proposed hardware for code acquisition is also capable of code tracking, and, hence, by performing both acquisition and tracking with the same circuitry, a significant simplification in the overall DS/SS receiver structure is gained. Analytical results show that the proposed scheme has good tracking performance, as measured by the hold-in time and the false alarm penalty time, and is less sensitive to variations in the signal-to-noise ratio (SNR) compared to conventional delay-locked loops (DLL's). Moreover, simulation results show that the proposed adaptive filter tracking scheme has a smaller residual tracking error than that produced by a conventional maximum-likelihood estimator (MLE).
Keyword:
adaptive filter
code tracking
spread spectrum
synchronization
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8.3
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1.2W
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3.6W
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