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检索条件"主题词=correlation detectors"

共 91 条记录，以下是21-30 订阅

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Masquerade detection system based on correlation Eigen Matrix and support vector machine

Masquerade detection system based on Correlation Eigen Matri...

引用

International Conference on Computational-Intelligence and Security

作者： Li, Zhanchun Li, Zhitang Liu, Bin Huazhong Univ Sci & Technol Network Ctr Wuhan 430074 Peoples R China

ISBN: (纸本)9781424406043

This article presents a masquerade detection system based on correlation Eigen Matrix and support vector machine (SVM). The system first creates a profile defining a normal user's behavior by correlation Eigen Matrix, and then compares the similarity of a current behavior with the created profile to decide whether the input instance is valid user or masquerader. In order to avoid overfitting and reduce the computational burden, user behavior principal features are extracted by the PCA method SVM is used to distinguish valid user or Masquerader for user behavior after training procedure has been completed by learning. In the experiments for performance evaluation the system achieved a correct detection rate equal to 82.6% and a false detection rate equal to 3.0%, which is consistent with the best results reports in the literature for the same data set and testing paradigm.

关键词： correlation detectors

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Application of cone detectors to detection of signals in structured interference

Application of cone detectors to detection of signals in str...

引用

1996 IEEE Digital Signal Processing Workshop (DSPWS-96)

作者： Ramprashad, SA Parks, TW CORNELL UNIV SCH ELECT ENGNITHACANY 14853

ISBN: (纸本)0780336291

The paper addresses a specific case of the detection of signals in noisy environments. In the situation to be considered, noise is modeled as additive Gaussian noise. Signals, and interference of more structure, are modeled as belonging to linear subspaces. The paper reviews and extends previous work on this problem by applying cone classes to model additional information of the relative energy of signals to structured interferences. detectors designed with this extended model are compared to classical subspace detectors. An example is given to illustrate possible improvements using this new detection scheme.

关键词： correlation detectors

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Blind watermarking in Contourlet domain with improved detection

Blind watermarking in Contourlet domain with improved detect...

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International Conference on Intelligent Information Hiding and Multimedia Signal Processing

作者： Jayalakshmi, M. Merchant, S. N. Desai, U. B. Indian Inst Technol SPANN Lab Dept Elect Bombay 76 Maharashtra India

ISBN: (纸本)9780769527451

This paper presents a novel method of blind image watermarking in contourlet domain. We have used spread spectrum technique for additive watermark embedding. A correlation detector is used to detect the embedded pseudorandom sequence. The binary logo thus retrieved proves authenticity of the image. The similarity of the retrieved binary logo with the original embedded logo is verified using correlation technique. Post processing of the retrieved logo gives better visual effects, further aiding threshold selection for detection. We have verified the robustness of the proposed method against different attacks including StirMark attack. The proposed method is compared with. a wavelet based blind technique and the results prove that contourlet based technique gives better robustness, under similar embedding conditions.

关键词： Blind correlation detectors Watermarking Visual effects embedding digital image watermarking spread-spectrum technique Domain PSEUDORANDOM SEQUENCES

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True RMS power detection with high dynamic range

True RMS power detection with high dynamic range

引用

1999 IEEE MTT-S International Microwave Symposium on the Magic Touch of Microwaves

作者： Klahn, G MPD Technol Inc Hauppauge NY 11788 USA

ISBN: (纸本)0780351355

All communication systems require some form of output power reporting as a means to manage the power efficiency of the output spectrum. Traditionally, this task has been performed with diode detectors. Diode detectors are non-linear devices and require elaborate compensation techniques to linearize and operate as a true RMS (Root Mean Square) detector over a wide dynamic and temperature range. A true RMS power detection scheme has been developed, which has a 22 dB dynamic range with +/- 1 dB accuracy and operates over a temperature range of -40 degrees C to +80 degrees C.

关键词： correlation detectors

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Low-cost and highly reliable detector for transient and crosstalk faults affecting FPGA interconnects

Low-cost and highly reliable detector for transient and cros...

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Design, Automation and Test in Europe Conference and Exhibition (DATE 06)

作者： Omana, M. Cazeaux, J. M. Rossi, D. Metra, C. Univ Bologna DEIS Viale Risorgimento 2 I-40136 Bologna Italy

ISBN: (纸本)9783981080117

In this paper we present a novel circuit for the on-line detection of transient and crosstalk faults affecting the interconnects of systems implemented using Field Programmable Gate-Arrays (FPGAs). The proposed detector features self-checking ability with respect to faults possibly affecting itself thus being suitable for systems with high reliability requirements, like those for space applications. Compared to alternate solutions, the proposed circuit requires a significantly lower area overhead, while implying a comparable, or lower, impact on system performance.. We have verified our circuit operation and self-checking ability by means of post-layout simulations.

关键词： correlation detectors

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Decorrelating detectors for a dual rate synchronous DS/CDMA system

Decorrelating detectors for a dual rate synchronous DS/CDMA ...

引用

IEEE 46th Vehicular Technology Conference - Mobile Technology for the Human Race (VTC 96)

作者： Saquib, M Yates, R Mandayam, N RUTGERS STATE UNIV WINLABPISCATAWAYNJ 08855

ISBN: (纸本)0780331583

This paper addresses the use of decorrelating detectors for a dual rate DS/CDMA system that serves both low bit rate and high bit rate users. All users have the same BPSK modulation technique and the same chip rate. The differences in bit transmission rates result in different processing gains for each class of user. We assume that in an interval of duration T₀, a low rate user transmits one bit while a high rate user transmits M bits. Applying a standard decorrelator to the interval of duration T₀ yields an M bit processing delay for high rate users and a computational complexity that grows with M. In this paper, we propose a decorrelator that generates bit decisions for each high rate user in every subinterval of duration T₀/M. To decode a low rate user, a soft decoding rule is considered. The soft decoding rule will apply maximal ratio combining on M separate decorrelated outputs of each low rate user. The soft decoding dual rate decorrelator eliminates the bit processing delay for high rate users and also reduces the computational complexity of a standard decorrelator. The proposed soft decoding decorrelator is found to perform nearly as well as the standard decorrelator while retaining the near-far resistance property.

关键词： correlation detectors

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Semi-blind decorrelating multi-user detectors for CDMA: Subspace methods

Semi-blind decorrelating multi-user detectors for CDMA: Subs...

引用

9th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 98)

作者： Host-Madsen, A Kwangju Inst Sci & Technol Kwangju 506712 South Korea

ISBN: (纸本)0780348729

We consider the problem of multi-user detection for CDMA systems where the codes of some users are known while others are unknown, semi-blind multi-user detection. An example is at the base station of a cellular communication systems with interference from both in-cell users, with known codes, and out-of-cell users, with unknown codes. In this paper we develop a number of decorrelating, semi-blind multi-user detectors, using a subspace approach. One of the detectors has a computationally efficient structure of a subspace estimation common to all known users, followed by a simple processing specific to each user. The performance of the detectors is compared to that of the purely blind decorrelating detector and the non-blind decorrelating detector, and the semi-blind detectors are seen to have the best performance.

关键词： correlation detectors

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Novel adaptive linearization for digitally modulated multi-carriers power amplifier using pre-distorter cum cross-correlator (PDCC)

Novel adaptive linearization for digitally modulated multi-c...

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Proceedings of the 1999 IEEE MTT-S International Microwave Symposium Digest 'The Magic Touch of Microwaves'

作者： Chia, Yan Wah Michael Zou, Yu Ko, Chi Chung Natl Univ of Singapore Singapore

We have rigorously analysed and developed a novel adaptive predistorter cum cross-correlator to linearize the distortions due to power amplifier for multi-carriers(MC) digitally modulated signals. The cross-correlator extracts the in-band and out-band intermodulation distortions which are exploited by the predistorter for linearization. Improvements in Carrier/Intermodulation (C/I), Noise-Power-Ratio (NPR) and time domain are reported.

关键词： correlation detectors

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Iterative multi-user detection of trellis code multiple access using a posteriori probabilities

Iterative multi-user detection of trellis code multiple acce...

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International Conference on Communications (ICC2001)

作者： Brännström, F.N. Aulin, T.M. Rasmussen, L.K. Chalmers University of Technology Department of Computer Engineering Telecommunication Theory Group SE-412 96 Göteborg Sweden

Iterative detectors for trellis code multiple access (TCMA) are suggested as an alternative to the joint maximum likelihood sequence detector (MLSD). Interleavers are introduced in the TCMA system as a new feature to separate the users. This implies that MLSD is now too complex to implement. The conventional interference cancellation (IC) detector has lower complexity, but its performance is shown to be far from acceptable. Another iterative detector having close to single user performance is therefore suggested. Instead of using lC, this detector updates the branch metric for every iteration and avoids the standard Gaussian approximation. It is also shown that the users can be detected when the interleaver is the only user specific feature in the TCMA system.

关键词： correlation detectors

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Linear finite memory-length multiuser detectors

Linear finite memory-length multiuser detectors

引用

Proceedings of the 1995 IEEE Global Telecommunications Conference. Part 2 (of 3)

作者： Juntti, Markku J. Aazhang, Behnaam Univ of Oulu Oulu Finland

Decorrelating, LMMSE, and the noise-whitening multiuser detectors for code-division multiple-access (CDMA) are ideally infinite memory-length (IIR) detectors. To obtain more practical and robust systems linear finite memory-length (FIR) multiuser detectors are studied in this paper. They are obtained by truncating the IIR detectors or by finding optimal FIR detectors. The optimal FIR detectors are shown to equal asymptotically the truncated detectors under mild conditions. Stable truncated decorrelating (or LMMSE) detector is shown to be near-far resistant, if the received powers are upper bounded, and if the memory-length is large enough (but finite). Numerical examples demonstrate that moderate memory-lengths are sufficient to obtain the performance of the IIR detectors even with severe near-far problem.

关键词： correlation detectors

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