Search Results - "Ali Khan, Nabeel"

Sparsity-Aware Adaptive Directional Time–Frequency Distribution for Source Localization by Ali Khan, Nabeel, Ali, Sadiq

“…Multi-component characteristics and missing data samples introduce artifacts and cross-terms in quadratic time–frequency distributions, thus affecting their…”
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Reconstruction of Non-stationary Signals with Missing Samples Using Time–frequency Filtering by Ali Khan, Nabeel, Mohammadi, Mokhtar

“…This study proposes a new time–frequency (TF) method for the recovery of missing samples from multicomponent signals. This is achieved by a combination of a…”
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Spike Detection Based on the Adaptive Time–Frequency Analysis by Mohammadi, Mokhtar, Ali Khan, Nabeel, Hassanpour, Hamid, Hussien Mohammed, Adil

“…This paper presents a novel spike detection algorithm in nonstationary signals using a time–frequency ( t – f ) approach. The proposed algorithm exploits the…”
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Automatic seizure detection using a highly adaptive directional time–frequency distribution by Mohammadi, Mokhtar, Ali Khan, Nabeel, Pouyan, Ali Akbar

“…Electroencephalogram (EEG) signals can be used by a proficient neurologist to detect the presence of seizure activity inside the brain. Automated detection of…”
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Direction of arrival estimation using adaptive directional time-frequency distributions by Ali Khan, Nabeel, Ali, Sadiq, Jansson, Magnus

“…Time-frequency distributions (TFDs) allow direction of arrival (DOA) estimation algorithms to be used in scenarios when the total number of sources are more…”
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Principles of time–frequency feature extraction for change detection in non-stationary signals: Applications to newborn EEG abnormality detection by Boashash, Boualem, Azemi, Ghasem, Ali Khan, Nabeel

“…This paper considers the general problem of detecting change in non-stationary signals using features observed in the time–frequency (t,f) domain, obtained…”
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A new feature for the classification of non-stationary signals based on the direction of signal energy in the time–frequency domain by Khan, Nabeel Ali, Ali, Sadiq

“…The detection of seizure activity in electroencephalogram (EEG) segments is very important for the classification and localization of epileptic seizures. The…”
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Modified Time-Frequency Marginal Features for Detection of Seizures in Newborns by Khan, Nabeel Ali, Ali, Sadiq, Choi, Kwonhue

“…The timely detection of seizure activity in the case of newborns can help save lives. Clinical signs of seizures in newborns are difficult to observe, so, in…”
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Seismic Random Noise Attenuation Using Sparse Low-Rank Estimation of the Signal in the Time-Frequency Domain by Anvari, Rasoul, Kahoo, Amin Roshandel, Mohammadi, Mokhtar, Khan, Nabeel Ali, Chen, Yangkang

“…Suppression of random noise in seismic data is a challenging preprocessing task. We propose a new denoising method, which includes the following steps. First,…”
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A Modified Viterbi Algorithm-Based IF Estimation Algorithm for Adaptive Directional Time–Frequency Distributions by Khan, Nabeel Ali, Mohammadi, Mokhtar, Djurović, Igor

“…Time–frequency (TF)-based instantaneous frequency estimation algorithms fail to achieve the desired performance when the underlying TF distribution suffers…”
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Locally Optimized Adaptive Directional Time–Frequency Distributions by Mohammadi, Mokhtar, Pouyan, Ali Akbar, Khan, Nabeel Ali, Abolghasemi, Vahid

“…This paper addresses the problem of estimating the parameters of adaptive directional time–frequency distributions (ADTFDs). ADTFDs locally optimize the…”
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Instantaneous frequency estimation of intersecting and close multi-component signals with varying amplitudes by Khan, Nabeel Ali, Mohammadi, Mokhtar, Ali, Sadiq

“…Instantaneous frequency (IF) estimation of multi-component signals with closely spaced and intersecting signal components of varying amplitudes is a…”
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An Efficient and Accurate Multi-Sensor IF Estimator Based on DOA Information and Order of Fractional Fourier Transform by Khan, Nabeel Ali, Ali, Sadiq, Choi, Kwonhue

“…Instantaneous frequency in multi-sensor recordings is an important parameter for estimation of direction of arrival estimation, source separation, and sparse…”
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Exploiting Temporal Correlation for Detection of Non-stationary Signals Using a De-chirping Method Based on Time–Frequency Analysis by Khan, Nabeel Ali, Ali, Sadiq

“…Novel time–frequency ( t – f ) methods are developed for the detection of non-stationary signals in the presence of noise with uncertain power. The proposed…”
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An Efficient Direction of Arrival Estimation Algorithm for Sources with Intersecting Signature in the Time–Frequency Domain by Khan, Nabeel Ali, Ali, Sadiq, Choi, Kwonhue

“…An efficient direction of arrival estimation method is proposed. The proposed algorithm accurately estimates the instantaneous frequency of signals received by…”
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A highly adaptive directional time–frequency distribution by Mohammadi, Mokhtar, Pouyan, Ali Akbar, Khan, Nabeel Ali

“…This paper presents an automatic method of computing a high-resolution adaptive time–frequency distribution. A recently developed locally adaptive directional…”
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Performance Comparison of Time-Frequency Distributions for Estimation of Instantaneous Frequency of Heart Rate Variability Signals by Khan, Nabeel, Jönsson, Peter, Sandsten, Maria

“…The instantaneous frequency (IF) of a non-stationary signal is usually estimated from a time-frequency distribution (TFD). The IF of heart rate variability…”
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Cross-term elimination in Wigner distribution based on 2D signal processing techniques by Ali Khan, Nabeel, Ahmad Taj, Imtiaz, Noman Jaffri, M., Ijaz, Salman

“…An efficient method based on 2D signal processing techniques and fractional Fourier transform is presented to suppress interference terms of Wigner…”
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A robust and efficient instantaneous frequency estimator of multi-component signals with intersecting time-frequency signatures by Khan, Nabeel Ali, Ali, Sadiq

“…•A method for instantaneous frequency estimation of signals with intersecting time-frequency signature is developed.•The method does not require TFD…”
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Cross-Term Suppression in Time Order Distribution for AWGN Signal by Mahmood, Waqas, Khan, Nabeel Ali, Memon, Noor Muhammad, Chaudhry, Fayyaz Ahmed

“…A technique of cross-term suppression in WD (Wigner Distribution) for a multi-component signal that is embedded WGN (White Gaussian Noise) is proposed. In this…”
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