132 Result(s)
within
Signal, Image and Speech Processing
**g-** Ge
Article
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Article
Modeling and Characterization of the 3rd Order Charge-Pump PLL: a Fully Event-driven Approach
In this paper, the event-driven concept is applied to the third order Charge-Pump Phase-Locked Loop (CP-PLL) and leads to the description of a behavioral model based on a set of exact and non-linear recursive ...
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Article
Multi-Shot Approach to Multiuser Separation and Interference Suppression in Asynchronous CDMA
In this work, we present a new, computationally simple scheme (termed multi-shot approach) to separate and detect multiuser signals in an asynchronous code-division multiple-access (CDMA) communications system...
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Article
A New Phase Acquisition Method of Address Code Utilizing the Combination of Logistic Map and BP Network
A novel phase acquisition method of code division multiple access (CDMA) address code is proposed in this paper. Based on the combination of chaotic nonlinear maps and backpropagation neural networks, this new...
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Article
Blind Reduced-Rank MMSE Detector for DS-CDMA Systems
We first develop a reduced-rank minimum mean squared error (MMSE) detector for direct-sequence (DS) code division multiple access (CDMA) by forcing the linear MMSE detector to lie in a signal subspace of a red...
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Space-Time Receiver for Multi-Rate CDMA Systems: Multi-Code and Variable Spreading Length Access Methods Comparison
This work proposed the linear minimum mean square error (LMMSE) space-timereceivers for synchronous multi-rate direct sequence code devision multipleaccess (DS/CDMA) systems. The performance of the proposed re...
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Article
Carrier Frequency Recovery Technique in OFDM Systems
Orthogonal frequency division multiplexing (OFDM) systems are highly sensitive to carrier frequency errors. In this paper, a new method utilizing pilots to do frequency synchronization in frequency domain is p...
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Improved LUT Technique for HPA Nonlinear Pre-Distortion in OFDM Systems
In this paper, we focus on the Look-up Table (LUT) technique for the compensation of HPA nonlinear distortion. An improved LUT method is proposed with better performance compared with conventional LUT techniqu...
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Article
Open AccessEvaluating Edge Detection through Boundary Detection
Edge detection has been widely used in computer vision and image processing. However, the performance evaluation of the edge-detection results is still a challenging problem. A major dilemma in edge-detection ...
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Open AccessSelective Weighting of Undecimated Wavelet Coefficients for Noise Reduction in SAR Interferograms
This paper describes a technique for noise reduction in synthetic aperture radar interferometry. The noisy interferogram is decomposed using undecimated wavelet transform and the coefficients are weighted. A n...
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Article
Time-Frequency Atom Decomposition with Quantum-Inspired Evolutionary Algorithms
Time-frequency atom decomposition (TFAD) provides a flexible representation for non-stationary signals, but the extremely high computational effort greatly blocks its practical applications. Quantum-inspired e...
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Article
Open AccessAdaptive Reliable Routing Based on Cluster Hierarchy for Wireless Multimedia Sensor Networks
As a multimedia information acquisition and processing method, wireless multimedia sensor network(WMSN) has great application potential in military and civilian areas. Compared with traditional wireless sensor...
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Open AccessESVD: An Integrated Energy Scalable Framework for Low-Power Video Decoding Systems
Video applications using mobile wireless devices are a challenging task due to the limited capacity of batteries. The higher complex functionality of video decoding needs high resource requirements. Thus, powe...
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Article
Open AccessGabor Directional Binary Pattern: An Image Descriptor for Gaze Estimation
This paper proposes an image descriptor, Gabor Directional Binary Pattern (GDBP), for robust gaze estimation. In GDBP, Gabor magnitude information is extracted firstly from a cropped subimage. The local direct...
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Article
Open AccessMaster Synchronization in Physical-Layer Communications of Wireless Sensor Networks
Synchronization in physical layer of wireless sensor networks is critical in restricting complexity of tag node and power consumption. Considering the master-to-tag communication (i.e., receiving signal from a...
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Article
Cooperative Transmission Using Quasi-Orthogonal Space-Time Block Codes with Adaptive Decode-and-Forward Relaying Protocol
In this paper, we propose a cooperative transmission scheme using quasi-orthogonal space-time block codes (QOSTBCs) for multiple-input multiple-output (MIMO) relay networks. Comparing with the conventional coo...
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Article
Adaptive Control with Guaranteed Contraction Rate for Systems with Actuator Saturation
The problem of adaptive control of linear discrete-time systems with actuator saturation and unknown parameters is investigated. A novel optimal control method is presented first for linear systems with known ...
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Article
Modified Collision-Free Interleavers for High Speed Turbo Decoding
Inter-window shuffle (IWS) interleavers are a class of collision-free (CF) interleavers that have been applied to parallel turbo decoding. In this paper, we present modified IWS (M-IWS) interleavers that can f...
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Article
Distributed Matching Schemes for Multi-source and Multi-relay Cooperative Wireless Networks
In this paper, we investigate how to assign source-relay pairs to achieve cooperative diversity for multi-source and multi-relay wireless networks. The problem of interest is formulated as a matching problem w...
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Article
Reduction of PAPR of OFDM Signals Using Nonlinear Companding Transform
In this paper, we propose and evaluate a novel nonlinear companding transform (NCT) scheme for peak-to-average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) systems. The key...
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Article
Secondary User Selection Scheme Using Adaptive Genetic Algorithms for Cooperative Spectrum Sensing Under Correlated Shadowing
Cooperative spectrum sensing has been shown to be an effective approach to improve the detection performance by exploiting the spatial diversity among multiple secondary users (or unlicensed users). However, d...
