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In this paper, the steady-state throughput of random-access packet broadcasting in optical CDMA network is analyzed, where the packet size is assumed to be fixed. Since the MAI and beat noise pose a significant impact on system performance in T/W optical CDMA system, using error correction code is an effective way to alleviate such adverse impact. Accordingly, the bit error rate can be further decreased...
Telehealthcare is a global trend affecting clinical practice in the world. With the progress and development of telecommunication technologies, telecom facilities have afforded telehealthcare a new approach for chronic disease management. The electrocardiogram (ECG) is commonly used to detect abnormal heart rhythms and to investigate the cause of heart abnormalities. To reduce the cardiologists' loading...
In this paper, we present a novel set of features which mainly comprises Fourier descriptors to facilitate the classification of white matter (WM) fiber tracts reconstructed from diffusion tensor imaging (DTI) tractography. Particularly, Fourier descriptors composing the feature vectors are different frequency terms of the discrete Fourier transform of the Euclidean coordinates of the step points...
In feed-forward networks, output pairwise correlations can increase with firing rate. Here, we study correlations between sensory neurons with global inhibitory feedback and cross-correlated external inputs. The average pairwise correlation coefficient is computed from simulations of a network of noisy leaky integrate-and-fire neurons with delayed spike-driven feedback. We focus on the relation between...
According to build the transient leakage models of the ship piping and research about the mechanism of negative pressure wave, the author gets the method of the ship piping leakage detection by combining with flow balance method. The frequently-used leakage detection of negative pressure wave, because the original signal has lots of noises and the frequent adjustable pump or the reset valve of ship...
A number of matrix-based data distortion methods are presented and experimentally studied in this paper. The performances of seven methods are compared in terms of utility, privacy and computational cost. We find that left multiplication based random projection methods are useless in data privacy protection. Even though there is no application-free solution in data privacy protection, the nonnegative...
In this paper, we present 3DLoc: an integrated system of hardware and software toolkits for locating an 802.11-compliant mobile device in a three dimensional (3D) space. 3DLoc features two specialized antennas: an azimuth antenna and an elevation antenna, for detecting the azimuth and elevation angles of a mobile device respectively in real time. To improve positioning accuracy in real-world urban...
This paper presents an iterative Maximum Likelihood Decoding (MLD) scheme for Multiple Input Multiple Output (MIMO) systems using Space-Time Block Codes (STBC) in strong directional interference scenario. The proposed scheme avoids matrix-inversion computation needed in ordinary reception schemes and estimates noise-subspace-projected channel matrix instead of real channel matrix to perform decoding...
Aim at the problem of sea-sky-line detection in sea-sky background image, a new method which is based on histogram analysis and linear fitting is proposed. It can obtain the information of pixels near the Sea-sky-line through an analysis of the histogram, and calculating the rough area to get rid of irrelevant pixels in order to extract the sea-sky-line through the method of linear fitting. The experimental...
Image registration is crucial for various image analysis tasks. In particular, most approaches to correction of bleed-through distortion on handwritten document images require the recto image and the verso image to be precisely registered. In this paper, we present a fully automatic method which detects specific number of corresponding control points from historical documents for the purpose of registration...
Current Alamouti's reception scheme for multiple input multiple output (MIMO) communication systems may fail to work when strong interferences exist in the MIMO channel. This paper analyzes and compares three reception schemes for MIMO systems using orthogonal space-time block codes (OSTBCs) suffered directional interferences. These schemes include conventional maximum likelihood decoding (MLD) scheme,...
"The Marauder's Map" is a magical map in J. K. Rowling's fantasy series, "Harry Potter and the Prisoner of Azkaban". It shows all moving objects within the boundary of the "Hogwarts School of Witchcraft and Wizardry". In this paper, we introduce a similar attack to location privacy in wireless networks. Our system, namely the digital Marauder's map, can reveal the locations...
This paper presents an interference suppression reception scheme for the multiple input multiple output (MIMO) communication systems using orthogonal space-time block codes (OSTBCs) in strong interference scenario. Based on the noise subspace projection, the maximum likelihood decoding (MLD) for OSTBCs can be achieved by simple linear processing in this scheme. Moreover, the approach to obtain the...
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