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Because of the effect of the space local scattering, when two non-coherent desired signals are incident in the mainlobe of the beampattern at the same time, the beampattern of the conventional adaptive beamformer can form a null in one of the desired signal directions, which will further destroy the integrity of the mainlobe and lead the output signal-to-interference-plus-noise ratio (SINR) to drop...
This paper addresses the robust beamforming design for a downlink cloud radio access network (cloud RAN) subject to per-base-station (BS) power constraint and individual signal-to-interference-plus-noise ratio (SINR) requirements. Our objective is to minimize the overall network power and backhaul cost while guaranteeing the users' SINR constraints for every channel realization by designing the joint...
In this paper, we investigate multiple-input single-output (MISO) simultaneous wireless information and power transfer (SWIPT) broadcast channels with confidential messages (BCC) scenario, in which a multiple-antenna transmitter simultaneously transmits confidential messages and power to multiple single-antenna receivers. Considering the imperfect channel state information (CSI), we study the joint...
We propose an enhanced automatic modulation classification algorithm based on Kolmogorov-Smirnov test. The proposed classifier employs the real and imaginary components extracted from the received signal as separate decision statistics. Also, unlike the conventional K-S test based algorithm, mean square error (MSE) between the empirical cumulative distribution and the hypothesized distribution for...
In this paper, the problem of adaptive beamforming in the presence of direction-of-arrival (DOA) mismatch is investigated. To develop a robust beamformer against such an imperfection, a new approach is devised by formulating an output signal-to-interference-plus-noise ratio (SINR) maximization problem. In particular, the proposed robust beamforming approach consists of two steps. At first, the standard...
Synthetic aperture Radar tomography has been widely used in 3D reconstruction in urban area. It can distinguish multi persistent scatterers in the same range-azimuth resolution cell. But how to detect and estimate the number and parameters of persistent scatterers is still an important and difficult problem need to be resolved. In this paper, a new method based on RELAX and generalized likelihood...
In this paper, a low-complexity robust adaptive beamforming method is proposed to against array steering vector (ASV) mismatch and effects of low snapshots. The robustness of proposed method depends on two aspects: the non-uniform diagonal loading which prevent the beamformer weight vector from converging to the noise components and variable diagonal loading factor can be changed adaptively when the...
The robustness of adaptive beamforming is relate to the input signal-to-noise ratio (SNR). In order to further improve the performance of input SNR estimation, a modified method of input SNR estimation for robust adaptive beamforming is proposed. Comparatively accurate value of the input SNR can be obtained by the proposed method, especially when the input SNR exceeds 0 dB. When the proposed method...
In this paper, a new algorithm to broaden the width of null is proposed. The algorithm is based on the property of subspace orthogonal principle between signal and noise and on virtual antenna array. Also diagonal loading technique is used to form robust beam pattern. With the theoretical analysis and computer simulations, it's shown that the superiority of proposed algorithm over other null broadening...
Paper is focused on problem of robust feature detector stability and efficiency in case when intensity distribution is uneven over image. Results of feature detector simulation and equations for estimation rate of false alarms and probability of correct detection are presented in paper.
In this research, we proposed the audio watermarking system with adaptive multilevel DWT (discrete wavelet transform) — SVD (singular value decomposition) based on BCH (Bose-Chaudhuri-Hocquenghem) code. The host audio signal is embedded with a watermark signal in the form of an image signal accompanied by several attacks on the watermarking system. The results showed that the perceptual quality of...
Set-Based Design (SBD) is an attractive paradigm to address challenges of a highly complex design space. Application of SBD is being actively explored by the US Navy to aid design of future naval shipboard systems. This paper reports a methodology following utilization of well-established product development and robust design tools that enable conducting SBD. Outputs from quality function deployment...
In this work, we present a novel robust distributed beam-forming (RDB) approach to mitigate the effects of channel errors on wireless networks equipped with relays based on the exploitation of the cross-correlation between the received data from the relays at the destination and the system output. The proposed RDB method, denoted cross-correlation and subspace projection (CCSP) RDB, considers a total...
Speech is the natural and vocalized form of human communication. Automatic Speech Recognition makes the computer to understand what was spoken by the speaker. Power Normalized Cepstral Coefficients (PNCC) is a feature extraction technique that uses power law non linearity. When the environmental condition changes, the accuracy of the system degrades. PNCC provides better enhancement in acoustical...
Synthetic aperture radar (SAR) image interpretation and analysis are heavily affected by the speckle noise typical of coherent acquisition systems. Very recently, a novel despeckling approach based on the exploitation of a priori information about the scattering behavior of the illuminated surface has been presented. The new scattering-based algorithms, named SB-PPB and SB-SARBM3D, represent a scattering-oriented...
We propose a diffusion expectation-maximization algorithm with adaptive combiner for distributed estimation over sensor networks. Due to the spatial distribution of the nodes, variation of node profile across the network is a common phenomena in real applications. The unreliable nodes exist and provide inaccurate estimates, which may be caused by high levels of noise or malicious attacks. Instead...
Orthogonal Frequency Division Multiplexing based M-ary Frequency Shift Keying (OFDM-MFSK) is a non- coherent modulation scheme that was proposed for robust transmission over fast fading environments. It combines the MFSK modulation scheme with OFDM. In this paper, the Generalised Frequency Division Multiplexing (GFDM) waveform is considered to use with MFSK to take the advantages of the low out of...
Wearable devices for real-time ECG monitoring and analysis require an accurate but simple QRS detection algorithm which does not consume too much computational load. Dual-threshold QRS detection techniques are one of the promising solutions to overcome this problem. This study investigates the performance and robustness of a dual-threshold QRS detection method under different levels of noise and physical...
Robust design methodology is concerned with the process and the product design while minimizing the effects of uncertainties in design and external noises. In robust design, optimum system design is sought with special emphasis on the insensitiveness of objective functions due to uncertainties. This study focuses on the robust design studies of vibration and shock isolation of sensitive electronic...
This paper deals with the problem of robust output regulation for a set of Quad-Rotors forming a geometric pattern. The proposed control strategy is based on sliding- modes techniques, and it is able to robustly regulate the corresponding Quad-Rotors positions and angles in the presence of some class of disturbances acting on the Quad-Rotors. The proposed regulation is composed by cascaded continuous...
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