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Adaptive Hybrid Acquisition of PN Sequences Based on Automatic Multipath Cancellation in Frequency-Selective Rayleigh Fading Channels

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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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Abbreviations

AHAP:

Adaptive hybrid acquisition processor

OSHAP:

Ordered statistic hybrid acquisition processor

DS-CDMA:

Direct sequence code division multiple access

PN:

Pseudo-noise

P fa :

Probability of false alarm

OSAP:

Order statistic acquisition processor

AAP:

Adaptive acquisition processor

ACAP:

Automatic censoring acquisition processor

HAPAC:

Hybrid Acquisition Processor based on Automatic multipath Cancellation

AWGN:

Additive white Gaussian noise

MIP:

Multipath intensity profile

pdf:

Probability density function

MGF:

Moment generating functions

Res:

The residue

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Authors and Affiliations

  1. Laboratoire Signaux et Systèmes de Communication, Département d’Electronique, Faculté des sciences de l’ingénieur, Université de Constantine, Route Ain El Bey, Constantine, 25000, Algeria

    Latifa Hacini, Atef Farrouki & Zoheir Hammoudi

Authors
  1. Latifa Hacini
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  2. Atef Farrouki
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  3. Zoheir Hammoudi
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Corresponding author

Correspondence to Latifa Hacini.

Additional information

This work is originally presented in ACTEA 2009, July 15–17, 2009. Notre Dame University, Zouk Mikael, Lebanon.

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Hacini, L., Farrouki, A. & Hammoudi, Z. Adaptive Hybrid Acquisition of PN Sequences Based on Automatic Multipath Cancellation in Frequency-Selective Rayleigh Fading Channels. Wireless Pers Commun 63, 147–166 (2012). https://doi.org/10.1007/s11277-010-0112-7

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