نتایج جستجو برای: incoherent signal subspace

تعداد نتایج: 440299  

Journal: :EURASIP J. Adv. Sig. Proc. 2014
Julan Xie Huiyong Li Zishu He Chaohai Li

A novel adaptive beamforming algorithm against large direction-of-arrival (DOA) mismatch without using optimization toolboxes is proposed. In contrast to previous works, this new beamformer employs two reconstructed matrices, the interference-plus-noise covariance matrix and the desired signal-plus-noise covariance matrix, instead of their real sample covariance matrix, respectively. These reco...

Journal: :IEEE transactions on image processing : a publication of the IEEE Signal Processing Society 1996
Ki-Seung Lee Won Doh Kun Jong Park Dae Hee Youn

This paper describes a block-by-block basis image enhancement algorithm which uses the signal subspace method to enhance images corrupted by uncorrelated additive noise. The enhancement is performed by eliminating the noise components in the noise subspace and estimating the clean image from the remaining components in the signal subspace.

Journal: :JDIM 2007
Biao Jiang Qianliu Cheng Guomin Ling

A novel subspace projection approach was proposed to improve the robustness of adaptive beamforming and direction finding algorithms. The cost function of the signal subspace scaled multiple signal classification (SSMUSIC) is minimized in the uncertainty set of the signal steering vector, the optimal solution to the optimization problem is that the assumed steering vector can be modified as the...

2004
Liang Dong Guanghan Xu

A novel approach to the adaptive transmission to combat fast fading effect in mobile wireless systems is presented. In this approach, the downlink beamforming weights of the base station antennas are generated based on the orthogonal basis of the uplink signal subspace. The signal intended for a particular mobile user is transmitted through its corresponding signal subspace. Due to the stabilit...

Journal: :IEEE Trans. Signal Processing 1996
Shahrokh Valaee Peter Kabal

say, the center frequency of the spectrum of the signals, and transform the subspace at each frequency bin into the subspace created by the span of the location vectors at the focusing frequency. Then, they use a high-resolmion algorithm such as MUSIC [SI to estimate the DOA's of the sources. They show that focusing reduces the resolution threshold signal-to-noise ratio (SMZ), which is defined ...

2014
Cheng Qian Lei Huang

Subspace-based methods rely on singular value decomposition (SVD) of the sample covariance matrix (SCM) to compute the array signal or noise subspace. For large array, triditional subspace-based algorithms inevitably lead to intensive computational complexity due to both calculating SCM and performing SVD of SCM. To circumvent this problem, a NyströmBased algorithm for array subspace estimation...

2016
Walid A. Zgallai

The aim of this paper is to detect fetal heart beats temporally overlapping with the transabdominally-measured QRS-complexes of the mother, non-invasively. Modified, Weighted and uterine contraction interference signal covariance matrix incorporated spectral MUSIC technique is applied. It is based on partitioning the subspace containing the ECG signal bearing the mother and fetal, and the ortho...

Journal: :IEEE Trans. Signal Processing 2001
Kehu Yang Yimin Zhang Yoshihiko Mizuguchi

In this paper, we present a novel space-time signal subspace-based subband approach to space-time adaptive processing (STAP) that has been shown to be an effective method to suppress both the intersymbol interference (ISI) and the cochannel interference (CCI) in mobile communications. We first study the performance of STAP and make clear the conditions of perfect processing (i.e., perfect equal...

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