Maximum-Likelihood Acquisition of Spread-Spectrum Signals in Frequency-Selective Fading Channels

Oh-Soon SHIN  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E97-A   No.7   pp.1642-1645
Publication Date: 2014/07/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E97.A.1642
Type of Manuscript: LETTER
Category: Spread Spectrum Technologies and Applications
Keyword: 
acquisition,  frequency-selective fading,  maximum-likelihood estimation,  spread-spectrum,  

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Summary: 
A maximum-likelihood code acquisition scheme is investigated for frequency-selective fading channels with an emphasis on the decision strategies. Using the maximum-likelihood estimation technique, we first derive an optimal decision rule, which is optimal in the viewpoint of probability of detection. Based on the derived optimal decision rule, a practical and simple decision rule is also developed, and its performance is assessed for both single dwell and double dwell acquisition systems. Simulation results demonstrate that the proposed acquisition scheme significantly outperforms the previously proposed schemes in frequency-selective fading channels.