Adaptive Double-Dwell Code Acquisition Scheme of PN Sequences Using Smart-Antenna and Automatic Censoring Techniques

Benkrinah, Sabra; Benslama, Malek

doi:10.1007/s11277-017-4969-6

Cited by 6 publications

(7 citation statements)

References 25 publications

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“…14,16 Its performance was studied via the smart antennas with the single-dwell serial search system, 14 and with the double-dwell serial search system. 16 The performance of the ACCA-ODV-CFAR was also compared with the automatic trimmed-mean (ATM)-CFAR. 16 The ATM-CFAR censors k1 cells from the lower end and k2 cells from the upper end to eliminate the effect of the interfering signals.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…16 The performance of the ACCA-ODV-CFAR was also compared with the automatic trimmed-mean (ATM)-CFAR. 16 The ATM-CFAR censors k1 cells from the lower end and k2 cells from the upper end to eliminate the effect of the interfering signals. Thus, the range trapped between k1 and Nc − k2 is obtained using the boxplot technique.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…Once the higher samples corresponding to the interfering signals are automatically censored, the remaining ones are taken to compute the adaptive detection threshold using one of the CFAR detection algorithms proposed in the literature. [14][15][16][17] It is well-known that the automatic censoring CFAR detectors do not require any prior knowledge about the number of interfering signals to achieve robust performance, but the drawback of these detectors is the large computational requirements due to the iteration in outlier rejection and background noise level estimation. 18 Against this background, we propose a new robust auto-adaptive approach based on the CFAR algorithm for PN code acquisition of the generalized MC DS-CDMA systems over frequency-selective multipath Rayleigh fading channels.…”

Section: Introductionmentioning

confidence: 99%

“…This essential requirement has led to the development of robust automatic censored methods where the number of unknown interfering signals in the full reference window is estimated and censored. Once the higher samples corresponding to the interfering signals are automatically censored, the remaining ones are taken to compute the adaptive detection threshold using one of the CFAR detection algorithms proposed in the literature 14‐17 . It is well‐known that the automatic censoring CFAR detectors do not require any prior knowledge about the number of interfering signals to achieve robust performance, but the drawback of these detectors is the large computational requirements due to the iteration in outlier rejection and background noise level estimation 18…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A robust auto‐adaptive approach for serial acquisition of generalized multi‐carrier spread spectrum in multipath fading mobile channels

Jouini¹,

Maali²,

Benssalah³

et al. 2020

Int J Communication

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SummaryIn this paper, a new robust auto‐adaptive approach for pseudo‐noise (PN) code acquisition is proposed. It is applied to the generalized multi‐carrier direct‐sequence code‐division multiple‐access (MC DS‐CDMA) systems communicating over frequency‐selective multipath Rayleigh fading channels. This new approach is based on the constant false alarm rate (CFAR) detection algorithm, referred here as automatic selection partial sum ordered statistics (ASPSOS)‐CFAR. The proposed approach does not require any prior information about the background environment and uses maximum likelihood estimation (MLE) method to detect the interfering signals group in the ranked cells for the full reference window. Once this group is identified and censored, the remaining smaller ranked cells are combined to form an estimate of the background noise level to compute the adaptive threshold. Through simulations, the performance of the proposed detector is analyzed and compared with traditional CFAR detectors based on fixed or automatic censoring algorithms. The obtained results show that the proposed detector eliminates the drawbacks of the previously related detectors and offers a robust detection performance to enhance the acquisition process in heterogeneous background environments.

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Section: Simulation Results and Discussionmentioning

confidence: 99%

Section: Simulation Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A robust auto‐adaptive approach for serial acquisition of generalized multi‐carrier spread spectrum in multipath fading mobile channels

Jouini¹,

Maali²,

Benssalah³

et al. 2020

Int J Communication

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show abstract

“…The inter-satellite link adopts time-division-multiple-access (TDMA) technology. Each link is assigned a short time-slot, which means signal acquisition and tracking need to be completed in a short time [ 7 ]. Moreover, inter-satellite link is characterized by complex electromagnetic interference and low signal-to-noise ratio (SNR).…”

Section: Introductionmentioning

confidence: 99%

A Dual-Channel Acquisition Method Based on Extended Replica Folding Algorithm for Long Pseudo-Noise Code in Inter-Satellite Links

Zhao

Chen

Feng

et al. 2018

Sensors

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Inter-satellite links are an important component of the new generation of satellite navigation systems, characterized by low signal-to-noise ratio (SNR), complex electromagnetic interference and the short time slot of each satellite, which brings difficulties to the acquisition stage. The inter-satellite link in both Global Positioning System (GPS) and BeiDou Navigation Satellite System (BDS) adopt the long code spread spectrum system. However, long code acquisition is a difficult and time-consuming task due to the long code period. Traditional folding methods such as extended replica folding acquisition search technique (XFAST) and direct average are largely restricted because of code Doppler and additional SNR loss caused by replica folding. The dual folding method (DF-XFAST) and dual-channel method have been proposed to achieve long code acquisition in low SNR and high dynamic situations, respectively, but the former is easily affected by code Doppler and the latter is not fast enough. Considering the environment of inter-satellite links and the problems of existing algorithms, this paper proposes a new long code acquisition algorithm named dual-channel acquisition method based on the extended replica folding algorithm (DC-XFAST). This method employs dual channels for verification. Each channel contains an incoming signal block. Local code samples are folded and zero-padded to the length of the incoming signal block. After a circular FFT operation, the correlation results contain two peaks of the same magnitude and specified relative position. The detection process is eased through finding the two largest values. The verification takes all the full and partial peaks into account. Numerical results reveal that the DC-XFAST method can improve acquisition performance while acquisition speed is guaranteed. The method has a significantly higher acquisition probability than folding methods XFAST and DF-XFAST. Moreover, with the advantage of higher detection probability and lower false alarm probability, it has a lower mean acquisition time than traditional XFAST, DF-XFAST and zero-padding.

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A Robust Acquisition Technique Using CFAR Adaptive Thresholding in Hybrid Spread Spectrum Systems

Yazdi

Pourmina

Haghbin

2021

Wireless Pers Commun

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Adaptive Double-Dwell Code Acquisition Scheme of PN Sequences Using Smart-Antenna and Automatic Censoring Techniques

Cited by 6 publications

References 25 publications

A robust auto‐adaptive approach for serial acquisition of generalized multi‐carrier spread spectrum in multipath fading mobile channels

A robust auto‐adaptive approach for serial acquisition of generalized multi‐carrier spread spectrum in multipath fading mobile channels

A Dual-Channel Acquisition Method Based on Extended Replica Folding Algorithm for Long Pseudo-Noise Code in Inter-Satellite Links

A Robust Acquisition Technique Using CFAR Adaptive Thresholding in Hybrid Spread Spectrum Systems

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