PN code acquisition using smart antennas and adaptive thresholding for spread spectrum communications

Sofwan, Aghus; Barkat, M.; AlQahtani, Salman A.

doi:10.1007/s11276-015-0969-1

Cited by 8 publications

(1 citation statement)

References 35 publications

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“…Correlation based techniques are commonly used for hypothesis testing problem in various radar and communications applications. In wireless communications, it has been used in spread spectrum direct sequence code division multipleaccess DS-CDMA systems for the PN code synchronization [20] and [21], while in CRs, the design of detectors that utilize the built-in periodicity autocorrelation property of the CP-OFDM primary users have been derived in [22], [23], [24] and [25], and is also considered in this paper.…”

Section: Introductionmentioning

confidence: 99%

A fast spectrum sensing for CP-OFDM cognitive radio based on adaptive thresholding

et al. 2016

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Recently, cyclostationarity (CS) based detection methods exploiting the autocorrelation periodicity property of the orthogonal frequency division multiplexing (OFDM) signals attracted a lot of attention. These detection methods are more complex than energy detection but they have better detection performance in low-SNR regimes. The drawback, however, is their extensive computational complexity. In this paper, we propose a computationally efficient spectrum sensing method for detecting unsynchronized OFDM signals in additive white Gaussian noise (AWGN). The proposed method exploits the second-order CS property of OFDM signals to set an adaptive threshold, which achieves the desired constant false alarm rate (CFAR) property. The complexity of the proposed method is significantly reduced compared with the scheme proposed in [22]. Monte-Carlo simulations illustrate that the performance of the proposed detector outperforms the classical energy detector (ED), the sliding window detector (SW) and Axell's detector in addition to guaranteeing a low sensing time

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Section: Introductionmentioning

confidence: 99%

A fast spectrum sensing for CP-OFDM cognitive radio based on adaptive thresholding

et al. 2016

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

Benkrinah

Benslama

2017

Wireless Pers Commun

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PN code acquisition using smart antennas and adaptive thresholding for spread spectrum communications

Cited by 8 publications

References 35 publications

A fast spectrum sensing for CP-OFDM cognitive radio based on adaptive thresholding

A fast spectrum sensing for CP-OFDM cognitive radio based on adaptive thresholding

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

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

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