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检索条件"主题词=Projection Algorithms"

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A new structure for sound reproduction system

A new structure for sound reproduction system

引用

2008 IEEE International Symposium on Circuits and Systems (ISCAS 2008), vol.4

作者： Ligang Liu Masahiro Fukumoto Sachio Saiki Kochi Koka Daigaku Kami Kochi JP Kochi University of Technology Japan

A novel structure with direct inversion of a multiple input multiple output (MIMO) system is proposed in this paper. Based on this structure, 2 adaptive algorithms, LMS like and Affine projection Algorithm (APA), are proposed to directly obtain an accurate estimate of the inverse of the plant system. The proposed algorithms have faster convergence speed than the FxLMS algorithm. Furthermore, this structure does not necessitate any a prior information of plant system and it can trace the fluctuation of the plant. It is shown through simulations that the proposed method overperforms the FxLMS algorithm in convergence speed so it is much applicable to real world environments than the FxLMS algorithm.

关键词： Finite impulse response filter Convergence Control systems Loudspeakers MIMO projection algorithms Fluctuations Adaptive filters Least squares approximation Adaptive algorithm

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Strong convergence of the projection method in convex feasibility problem

Strong convergence of the projection method in convex feasib...

引用

9th International Symposium on Symbolic and Numeric algorithms for Scientific Computing

作者： Stefan, Maruster W Univ Timisoara Dept Informat Timisoara Romania

The strong convergence properties of the projection method for convex feasibility problem are investigated in the frame of a real Hilbert space. The significant role of the regularity properties for strong convergence... 详细信息

ISBN: (纸本)9780769530789

关键词： Hilbert space Convergence of numerical methods Scientific computing Informatics Joining processes Iterative methods Books projection algorithms

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Compressive phase retrieval

Compressive phase retrieval

引用

Conference on Wavelets XII

作者： Moravec, Matthew L. Romberg, Justin K. Baraniuk, Richard G. Rice Univ Dept Elect & Comp Engn POB 1892 Houston TX 77251 USA Georgia Tech Sch Elect & Comp Engn Atlanta GA USA

ISBN: (纸本)9780819468499

The theory of compressive sensing enables accurate and robust signal reconstruction from a number of measurements dictated by the signal's structure rather than its Fourier bandwidth. A key element of the theory is the role played by randomization. In particular, signals that are compressible in the time or space domain call be recovered from just a few randomly chosen Fourier coefficients. However, in some scenarios we can only observe the magnitude of the Fourier coefficients and not their phase. In this paper, we study the magnitude-only compressive sensing problem and in parallel with the existing theory derive sufficient conditions for accurate recovery. We also propose a new iterative recovery algorithm and study its performance. In the process, we develop a new algorithm for the phase retrieval problem that exploits a signal's compressibility rather than its support to recover it from Fourier transform magnitude measurements.

关键词： compressive sensing phase retrieval projection algorithms

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Linearly constrained orthogonal projection algorithm for reduced rank adaptive array processing

Linearly constrained orthogonal projection algorithm for red...

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Antennas and Propagation Society International Symposium

作者： Ding Qian jun Fei Ai guo Chen Hui

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An Efficient Oblique projection Algorithm for V-BLAST Detection with Novel Ordering

An Efficient Oblique Projection Algorithm for V-BLAST Detect...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Zizhe Ding Xian-Da Zhang Qiubin Gao Yong-Tao Su Department of Automation Tsinghua University Beijing China

A novel oblique projection based detection scheme is proposed to reduce the computational cost of the vertical Bell Laboratories Layered Space-Time (V-BLAST) receivers. It constructs the ordinary zero-forcing (ZF) and minimum mean- square error (MMSE) detectors by oblique projector implementation, and has a computationally efficient way via projection matrix recursion. Different from the existing ones, we design a so-called "inverse" detection order to facilitate this new approach, whose complexity compares favorably with the competing alternatives. Theoretical analysis and simulation results show the efficiency of the proposed algorithm.

关键词： projection algorithms Detectors Detection algorithms Algorithm design and analysis Automation Computational efficiency Signal analysis Computational modeling Analytical models Data mining

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Adaptive Parallel Variable-Metric projection Algorithm -An Application to Acoustic Echo Cancellation

Adaptive Parallel Variable-Metric Projection Algorithm -An A...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Masahiro Yukawa Isao Yamada Department of Communications and Integrated Systems Tokyo Institute of Technology Japan

In this paper, we propose a novel adaptive filtering algorithm named adaptive parallel variable-metric projection (APVP) algorithm, which includes the proportionate normalized least mean square (PNLMS) algorithm as its special example. The proposed algorithm is based on parallel projection (onto multiple closed convex sets) with time-varying metrics. A convergence analysis of the proposed algorithm is presented with the aid of the adaptive projected subgradient method. Numerical examples demonstrate that the proposed algorithm realizes echo cancellation superior to the conventional algorithms.

关键词： projection algorithms Acoustic applications Echo cancellers Filtering algorithms Convergence Adaptive filters Algorithm design and analysis Electronic mail Hilbert space Multiple access interference

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Single-antenna projection algorithm to discriminate super-imposed Secondary Surveillance Radar Mode S signals

Single-antenna projection algorithm to discriminate super-im...

引用

European Radar Conference (EURAD)

作者： E.G. Piracci N. Petrochilos G. Galati CIVV & DISP Tor Vergata University of Rome Rome Italy University of Hawaii Manoa Honolulu HI USA

This paper presents a novel, effective algorithm to discriminate and separate super-imposed SSR (Secondary Surveillance Radar) Mode S signals. Our goal is a blind separation of multiple SSR sources using a single channel receiver. Other algorithms perform sources separation exploiting space diversity or statistical properties, but with the practical inconvenience of the need for a multi-channel receiver. As today SSR stations are equipped with single-channel receivers (for Multilateration and Wide Area Multilateration applications, M-LAT, WAM) the proposed algorithm is aimed to be operationally useful.

关键词： projection algorithms Surveillance Radar Frequency Transponders Antenna measurements Time measurement Decoding Array signal processing Signal processing

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Blind Adaptive Channel Equalization Based on Affine projection Algorithm

Blind Adaptive Channel Equalization Based on Affine Projecti...

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International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications (MAPE)

作者： Yu-Zhong Jiang Shu-Xia Zhang Liang-Yuan College of Information and Electrical Engineering Naval University of Engineering Hubei China College of Naval Arms Command Nanjing Jiangsu China

In this Letter, we address a novel constant modulus algorithm (CMA) based on affine projection algorithm (APA) for blind equalization transmission channel of QPSK systems to deal with inter symbol interference (ISI). Our algorithm is more rapidly convergence, tracking properties and slightly improved steady-state equalization performance than the same category algorithms such as LMS-CMA and NLMS-CMA, and computationally more efficient with similar convergence compared with least squares algorithm (LS-CMA). Simulation results are presented to compare our APA-CMA algorithm with the blind NLMS-CMA and LS-CMA schemes.

关键词： Adaptive equalizers Blind equalizers projection algorithms Convergence Signal processing algorithms Lagrangian functions Intersymbol interference Vectors Computational efficiency Microwave antennas

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An airborne image stabilization method based on the Gaussian mixture model

An airborne image stabilization method based on the Gaussian...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： Hongbin Deng Yunde Jia Yihua Xu Wei Liang Beijing Inst Technol Sch Comp Sci & Technol Beijing 100081 Peoples R China

ISBN: (纸本)9781424409907

In this paper, an image stabilization method based on the adaptive Gaussian mixture model (GMM) is presented in order to smooth down the airborne image vibration. Firstly, the projection algorithm is adopted for the motion estimation;Secondly, GMM parameter is obtained after analyzing characteristics of the first n images;Finally, a stable image sequence is achieved after GMM motion filter operates on the motion parameter. The experimental results show that the method has the advantage of fast speed and effectively smooth unwanted vibration of image sequences.

关键词： Motion estimation Digital images Motion compensation Image sequences Vibrations Motion analysis Matched filters projection algorithms Image analysis Image motion analysis

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Super-imposed Mode S signals: Single-antenna projection Algorithm and processing architecture

Super-imposed Mode S signals: Single-antenna Projection Algo...

引用

IEEE International Symposium on Signal Processing and Information Technology (ISSPIT)

作者： E.G. Piracci N. Petrochilos G. Galati CIVV & DISP Tor Vergata University Rome Italy Universityof Hawaii at Manoa Honolulu HI USA

This paper presents an effective algorithm to discriminate and separate superimposed SSR (secondary surveillance radar) mode S signals. The algorithm is an adaptation of the PA (projection algorithm) [1,3,4] that perform a blind separation of the multiple SSR sources using a single channel receiver. As present-days SSR stations only have a single-channel receiver, the proposed algorithm is operatively useful, specially for multilateration and wide area multilateration applications, (M-LAT, WAM). The algorithm is evaluated with real recorded data and also simulated signals generated by a complete simulation of a typical MLAT Rx station, from the RF to the digital section. We discuss as well the estimation of the time of arrival for each overlapped signal, that is necessary for the timing. Finally we propose a possible architecture for the signals separation block of the digital processor of the receiving station.

关键词： Signal processing projection algorithms Signal processing algorithms Timing Source separation Antenna arrays RF signals Signal generators Radio frequency Transponders

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