Unified approach for performance analysis of Cognitive Radio Spectrum Sensing over correlated multipath fading channels

Al-Juboori, Salam; Fernando, Xavier

doi:10.1109/wowmom.2015.7158194

Cited by 6 publications

(5 citation statements)

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“…The higher the number of tapers, the more processing burdens unnecessarily invoked and, hence, practically meaningful values need to be managed. One of the essential evaluation tools is the receiver operation characteristic (ROC) curve, which governs the two probabilities given in (22) and (24). Since the ROC curve shows the achieved as a function of the , it exposes the general performance for a particular detector.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Among several recent studies in this regard, one particularly interesting investigation [22] showed that fading, such as Nakagami type, can cause harmful correlation between channels and this will degrade the detection process. Therefore, a mitigation approach employing diversity techniques, especially MRC, was suggested to alleviate such fading effects and eventually render the SE performance more robust against noise uncertainty [13,22]. An alternative remedy of fading is by exploiting multicarrier (MC) or multitoned (MT) transmission features.…”

Section: Introductionmentioning

confidence: 99%

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Spectrum sensing in cognitive radio using multitaper method based on MIMO-OFDM techniques

et al. 2019

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The current inefficient utilization of frequency spectrum has alerted regulatory bodies to streamline improvements. Cognitive radio (CR) has recently received considerable attention and is widely perceived as a promising improvement tool in estimating, or equivalently sensing, the frequency spectrum for wireless communication systems. The cognitive cycle in CR systems is capable of recognizing and processing better spectrum estimation (SE) and hence promotes the efficiency of spectrum utilization. Among different SE methods, the multi-taper method (MTM) shows encouraging results. Further performance improvement in the SE for CR can be achieved by applying multiple antennas and combining techniques. This paper proposes a constructive development of SE using MTM, abbreviated as MTSE, and by employing multiple-input multiple-output (MIMO), parsed into separate parallel channels using singular value decomposition (SVD), and maximum ratio combining (MRC) configurations. Deviating from these improvements, however, multicarrier systems such as orthogonal frequency division multiplexing (OFDM) show inferior sensing performances due to the noise multiplicity generated and combined from all subcarrier channels. By means of the quadrature matrix form, the probabilities for such integrated settings of SE have been derived to reach at their approximate asymptotes. Numerical simulations revealed specific better performances stemmed from coupling the fashionable MTSE and MIMO technologies.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spectrum sensing in cognitive radio using multitaper method based on MIMO-OFDM techniques

et al. 2019

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“…In our earlier work [17], we extended the investigations in [15] by deriving exact closed-form expressions for constant and exponentially correlated L-antenna branches in Nakagami-m channel for MRC diversity technique.…”

Section: Introductionmentioning

confidence: 99%

“…Second, in order to gain an insight into the derived expressions, numerical evaluations are done for both MRC and EGC diversity solutions. We consider SNR values and fading severities that are different than those considered in [17]. Numerical results show that the inter-branch correlation impacts the detector performance significantly.…”

Section: Introductionmentioning

confidence: 99%

Multiantenna Spectrum Sensing Over Correlated Nakagami-$m$ Channels With MRC and EGC Diversity Receptions

Al-Juboori

Fernando

2018

IEEE Trans. Veh. Technol.

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Increasing number of antennas are closely packed in emerging multiantenna systems and correlation among them can no longer be ignored. In this paper, such a multiantenna spectrum sensing system is investigated considering dual, triple, four and up to infinite number of correlated antenna branches. Constant, arbitrary and exponential correlation among the antenna branches are considered. Closed form expressions for the detection probability, in terms of the confluent hypergeometric function, is derived assuming maximal ratio combining (MRC) and equal gain combining (EGC) diversity techniques in Nakagami-m multipath fading channel. Numerical results quantify the interbranch correlation that impacts the detector performance significantly. However, results also show that this effect could be compensated by employing the appropriate diversity combining technique and by increasing the diversity branches. Furthermore, we find that at high m values (Rician like channel), low false alarm probability and highly correlated environments, EGC which is a simpler scheme performs as good as MRC which is a more complex scheme.

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“….17)Now, by choosing appropriate parameter values to satisfy the condition within, the solution of (3.15) is[78,79] …”

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confidence: 99%

Multichannel spectrum sensing over correlated fading channels with diversity reception

Al-Juboori¹,

Fernando²

2022

Preprint

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Accurate detection of white spaces is crucial to protect primary user against interference with secondary user. Multipath fading and correlation among diversity branches represent essential challenges in Cognitive Radio Network Spectrum Sensing (CRNSS). This dissertation investigates the problem of correlation among multiple diversity receivers in wireless communications in the presence of multipath fading. The work of this dissertation falls into two folds, analysis and solution. In the analysis fold, this dissertation implements a unified approach of performance analysis for cognitive spectrum sensing. It considers a more realistic sensing scenario where non-independent multipath fading channels with diversity combining technique are assumed. Maximum Ratio Combining (MRC), Equal Gain Combining (EGC), Selection Combining (SC) and Selection and Stay Combining (SSC) techniques are employed. Arbitrarily, constant and exponentially dual, triple and L number of Nakagami-m correlated fading branches are investigated. We derive novel closed-form expressions for the average detection probability for each sensing scenario with simpler and more general alternative expressions. Our numerical analysis reveals the deterioration in detection probability due to correlation especially in deep fading. Consequently, an increase in the interference rate between the primary user and secondary user is observed by three times its rate when independent fading branches is assumed. However, results also show that this effect could be compensated for, through employing the appropriate diversity technique and by increasing the diversity branches. Therefore, we say that the correlation cannot be overlooked in deep fading, however in low fading can be ignored so as to reduce complexity and computation. Furthermore, at low fading, low false alarm probability and highly correlated environments, EGC which is simpler scheme performs as good as MRC which is a more complex scheme. Similar result are observed for SC and SSC. For the solution fold and towards combatting the correlation impact on the wireless systems, a decorrelator implementation at the receiver will be very beneficial. We propose such decorrelator scheme which would significantly alleviate the correlation effect. We derive closed-form expressions for the decorrelator receiver detection statistics including the Probability Density Function (PDF) from fundamental principles, considering dual antenna SC receiver in Nakagami-m fading channels. Numerical results show that the PDF of the bivariate difference could be perfectly represented by a semi-standard normal distribution with zero mean and constant variance depending on the bivariate's parameters. This observation would significantly help simplifying the design of decorrelator receiver. The derived statistics can be used in the problem of self-interference for multicarrier systems. Results also show the outage probability has been improved by double, due to the decorrelator.

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Unified approach for performance analysis of Cognitive Radio Spectrum Sensing over correlated multipath fading channels

Cited by 6 publications

References 20 publications

Spectrum sensing in cognitive radio using multitaper method based on MIMO-OFDM techniques

Spectrum sensing in cognitive radio using multitaper method based on MIMO-OFDM techniques

Multiantenna Spectrum Sensing Over Correlated Nakagami-$m$ Channels With MRC and EGC Diversity Receptions

Multichannel spectrum sensing over correlated fading channels with diversity reception

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