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The paper introduces an OFDM signal detector based on cyclic correlation function. The detector belongs to the class of blind SCD detectors. The paper presents the main relations connected with the idea of cyclostationarity and cyclostationary features of OFDM signals. Results of simulations are presented as well.
Cognitive Radio (CR) is a technique that was headed ahead for utilizing the unused spread spectrum effectively with less interference. The principal task of a CR system is to sense the holes (spaces) effectively and efficiently in the designated frequency spectrum. Here in this work spectrum sensing is carried out by Cyclostationary detector. A random signal is generated and it is modulated either...
In this paper, we analyze multiple-input multiple-output quadrature spatial modulation (QSM-MIMO) systems that operate under imperfect channel information over correlated α-μ fading channels. A simple and closed-form expression for the pairwise error probability (PEP) is provided. Based on the obtained PEP, a closed-form upper bound expression for the average bit error probability (BEP) is obtained...
Due to environment disturbance, interference between the normal modes, and the ambient noise, the spatial correlation between received signals is attenuated. In this paper, we consider the problem of detection performance degradation caused by spatial correlation attenuation, and a broadband correlation detection method based on the normal mode extraction is proposed accordingly. The method extracts...
In this paper we propose a task-driven progressive part localization (TPPL) approach for fine-grained object recognition. Most existing methods follow a two-step approach which first detects salient object parts to suppress the interference from background scenes and then classifies objects based on features extracted from these regions. The part detector and object classifier are often independently...
The Low Probability of Intercept (LPI) signals are of great interest in underwater acoustics. LPI signals are designed such that their presence is difficult to detect, hence taking countermeasures against them are less likely. The traditional method of LPI waveform design is to spread the signal energy in time and/or frequency thus making it indistinguishable from ambient noise. In this paper, we...
This paper turns on blotches detection in archived video. Blotches could be considered as the most common artifacts in archived video. This type of artifacts is not temporally correlated, it can be considered as impulse noise in time. To detect blotches, the proposed approach is performed into two mains steps: blotch regions candidate extraction and classification of these regions as blotches or not...
Spectrum sensing presents a substantial challenge in the novel emerging telecommunications technologies, and a crucial step that should be performed by cognitive user to identify the unoccupied frequency bands, in order to enhance the spectral efficiency and the QoS to both licensed and unlicensed users. In this paper, we propose a novel sensing approach based on the cross-correlated moments' selection...
Adaptive radar detection and estimation schemes are often based on the independence of the secondary data used for building estimators and detectors. This paper relaxes this constraint and deals with the non-trivial problem of deriving detection and estimation schemes for joint spatial and temporal correlated radar measurements. Latest results from Random Matrix theory, used for large dimensional...
MIMO technology increases channel capacity and data rates using multiple antennas and multiple receiver chains. In wideband scenario, each receiver has multiple copies of estimated channel matrices, and selection of a well conditioned channel matrix is required for faithful detection. There are ample of methods reported for channel estimation. This paper presents an algorithm which selects a desired...
Recently, steganalysis based on hypothesis test theory becomes a focus. However, the correlation between adjacent pixels is not exploited and this is obviously not reasonable. In this paper, a new detector for least significant bit matching (LSBM) steganography is proposed with the consideration of pixel correlation. The cover pixels are modeled by multivariate Gaussian distribution and a new detector...
In the actual wireless communication systems, non-Gaussian noise often has a negative effect on the signals which cognitive users finally receive. In addition, due to the high frequency of collecting samples, there may be a certain correlation among the noise components. A detection method based on fractional lower order moments (FLOM) is applied in this paper to solve spectrum sensing in weakly correlated...
Region of interest (ROI) generation used to extract candidate windows which are likely to have pedestrians is an important step in pedestrian detection systems. In this paper, we propose a novel algorithm to reduce the number of candidate windows extracted as ROI to reduce the computation time of pedestrian detection. In our proposed method, we take advantage of the temporal correlation between the...
Nowadays, with the expansion of virtual spaces, interactions between anonymous users have also increased. These interactions can provide new opportunities and threats for users of this virtual spaces. One way to reduce these threats in such spaces is to use feedback-based reputation systems to estimate the trustworthiness of users. However, the feedback-based reputation systems are known to be particularly...
An experimental investigation has been carried out to characterize and discriminate seven saffron samples and to verify their declared geographical origin using a voltammetric electronic tongue (VE-tongue). The ability of multivariable analysis methods such as Principal Component Analysis (PCA), Hierarchical Cluster Analysis (HCA) to classify the saffron samples according to their geographical origin...
Acoustic signal, speech, having a property for detecting the gender of a speaker. This is well known as Gender Detection (GD). In this paper, we propose pitch based gender detection algorithm. Pitch is the fundamental frequency of speech signal. Gender Detection using pitch can be performed in time domain, frequency domain, or in both. In this current paper, we propose an efficient time domain based...
Multiple modalities such as color, texture, shape and motion need to be analyzed separately and fused together to get the comprehensive result in content-based video concept analysis. We propose a multimodal fusion method based on a mechanical node equilibrium model. It treats the scores ofmultiple modalities and the fused score as physical nodes. Between these nodes, we define correlations which...
This paper proposes a technique for intercepting the symmetric signals and uses the example of the widely used Triangular FM waveform as a case study, due to its importance. The interception process involves performing convolution of the received signal with itself. Due to the symmetric nature of the Triangular FM waveform, the output of this self-convolution procedure is the same as the autocorrelation...
Methods such as Compton imaging can be used to image a radiation field, including localizing different radioactive isotopes. Depth of interaction detection enables Compton imaging using Cadmium Zinc Telluride (CZT) detector for gamma ray energies above ∼300 keV. We have developed an imaging technique for low energy gamma rays, using an array of CZT sensors, based on the non-uniform penetration of...
In the framework of the construction of a novel Femtoscope Array for Correlation and Spectroscopy, named FARCOS, aiming at the identification in charge and mass even of particles stopping in the first detection layer, we are performing a thorough characterization of the silicon detector layers in terms of the collection properties as a function of the point of incidence. We have experimental evidence...
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