Adaptive Hybrid Acquisition of PN Sequences Based on Automatic Multipath Cancellation in Frequency-Selective Rayleigh Fading Channels |
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Authors: | Latifa Hacini Atef Farrouki Zoheir Hammoudi |
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Affiliation: | 1.Laboratoire Signaux et Systèmes de Communication, Département d’Electronique, Faculté des sciences de l’ingénieur,Université de Constantine,Constantine,Algeria |
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Abstract: | A hybrid PN-code acquisition scheme is proposed and studied for direct sequence code division multiple access communications
in frequency-selective Rayleigh fading channels. The most important feature of the proposed system is its ability to dynamically
estimate the number of multipath signals that may lie in the reference channel. The basic idea of the considered algorithm
is to sort the partial correlations and carry out successive censoring tests by updating the noise estimation until the first
path synchronization. Exact expressions for the probability of false alarm and the mean acquisition time are derived. The
performances of the proposed system are then studied and compared with those of the adaptive hybrid acquisition processor
(AHAP) and the ordered statistic hybrid acquisition processor (OSHAP). The effects of various channel parameters on the acquisition
performance, namely the number of resolvable paths, the multipath intensity profile and the signal-to-noise ratio are also
investigated. Numerical results show that the proposed acquisition scheme outperforms the conventional ones which are based
on AHAP and OSHAP algorithms. |
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