Time frequency scale transforms
Báo cáo sinh học: " Performance evaluation of space-time-frequency spreading for MIMO OFDM-CDMA systems" ppt
... an open-loop MIMO OFDM-CDMA scheme using space-timefrequency spreading (STFS), in the presence of frequency-selective Rayleigh-fading channel The BER and BLER performance of the OFDM-CDMA system ... scheduling In addition, it offers better diversity/multiplexing trade-off The performance of MIMO OFDM–CDMA scheme using STFdomain spreading is investigated with zero-forcing (ZF) receiver It is ... section, joint space-time-frequency spreading is proposed for the downlink of an openloop multi-user system employing single-user MIMO (SU -MIMO) system based on OFDMCDMA system A MIMO OFDM channel...
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Báo cáo toán học: " Performance evaluation of space-time-frequency spreading for MIMO OFDM-CDMA systems" pptx
... N c , the OFDM-CDMA 60 Proposed OFDM-CDMA 2D OFDM-CDMA Number of Users 50 40 30 20 10 0 10 12 14 16 SNR dB Figure 10 System throughput comparison for OFDM-CDMA system with 4Tx, 4Rx of the proposed ... scheduling In addition, it offers better diversity/multiplexing trade-off The performance of MIMO OFDM-CDMA scheme using STF-domain spreading is investigated with zero-forcing (ZF) receiver It ... doi:10.1186/1687-6180-2011-139 Cite this article as: Dahman and Shayan: Performance evaluation of space-time-frequency spreading for MIMO OFDM-CDMA systems EURASIP Journal on Advances in Signal Processing...
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Báo cáo hóa học: " Editorial Time-Frequency Analysis and Its Applications to Multimedia Signals" pptx
... “Parametric time-frequency analysis and its applications in music classification,” by Y Shen et al., deals with analysis and classification of music signals Music signals are decomposed into atoms using ... on time-frequency analysis and Hermite projection method” by S Stankovi´ et al to provide a method c for temporal analysis and reconstruction of digital video sequences The S-method is used to ... roughly categorized into two general areas: (1) robust and fragile digital data protection algorithms and (2) time-frequency- based algorithms for data analysis, classification, and compression In...
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Báo cáo hóa học: " Research Article Parametric Time-Frequency Analysis and Its Applications in Music Classification" pdf
... classification accuracy rate Since each sample is excluded from the training set in turn, the independence between the test set and the training set is maintained In a database with N examples, ... found in the appendix 3.2 Classification Scheme 3.2.1 Linear Discriminant Analysis (LDA) In this work, pattern classification is carried out using the linear discriminant analysis (LDA) technique in ... rock-like music and classical-like music In order to look more into the characteristics demonstrated by rock-like music samples and classical-like music samples, and define the discriminatory features...
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Báo cáo hóa học: "Research Article Time-Frequency and Time-Scale-Based Fragile Watermarking Methods for Image Authentication Braham Barkat1 and Farook Sattar (EURASIP Member)2 1 Department 2 Faculty" pdf
... (16 1, 12 9) 1. 1 Block index 26 7 28 3 29 9 315 3 31 28 4 300 316 3 32 (16 1, 16 8) 0.9 0.8 16 × authentication block 0.7 0.6 0.5 0.4 0.3 50 10 0 15 0 20 0 25 0 300 350 400 450 500 Block index (19 2, 12 9) 26 8 (19 2, ... 10 −4 32. 89 98% 44. 41 0.0 014 28 .69 95% 41. 53 0. 010 1 19 .95 90% 38.83 0. 026 7 15 .74 80% 35.94 0.06 41 11. 93 70% 34. 41 0.0956 10 .19 60% 33.34 0 .10 61 9.74 50% 32. 56 0 . 12 27 9 .11 w mag (i) − , Nw i =1 ... Rotation (1 degree) −0.00 72 Cropping −0.0094 JPEG (QF = 99%) 0 .20 27 considered here is given by [ 21 ] J− h(i1 )h(i2 )xLL (2n1 − i1 , 2n2 − i2 ), J xLL (n1 , n2 ) = i1 ,i2 J− h(i1 )g(i2 )xLL (2n1 − i1...
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Báo cáo hóa học: " Research Article A Sparsity-Based Approach to 3D Binaural Sound Synthesis Using Time-Frequency Array Processing" ppt
... Multisource Binaural Sound Synthesis It is widely known that binaural sound synthesis is a technique capable of reproducing a virtual sound image of a recorded sound signal at an apparent position ... proposed approach for binaural sound synthesis (1) The signals obtained by the microphones of the array enter the analysis stage (2) In the analysis stage, the four signals are first transformed into ... shown to be still useful for sparsity-based applications such as source separation [28, 29] 3.3 Array Geometry and DOA Estimation Now consider a tetrahedral microphone array (M = 4) with base radius...
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Báo cáo hóa học: " Research Article Time-Frequency-Based Speech Regions Characterization and Eigenvalue Decomposition Applied to Speech Watermarking" pptx
... the autocorrelation matrix RSMD is calculated according to (21) The eigenvalues and eigenvectors are obtained by using the eigenvalues decomposition of RSMD The eigenvectors are equal to the ... different regions Consequently, it may lead to a variable amount of watermark within different regions Thus, in order to overcome these difficulties, the eigenvalue decomposition method is employed for speech ... routine is applied to the S-method), the eigenvalues and eigenvectors are obtained by using the Matlab built-in function (eigs) Twenty eigenvectors are selected, weighted by the corresponding eigenvalues,...
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Báo cáo hóa học: " Research Article Validity-Guided Fuzzy Clustering Evaluation for Neural Network-Based Time-Frequency Reassignment" potx
... values of these validity measures for fuzzy clustering the GustafsonKessel clustering has the very best results The GustafsonKessel fuzzy clustering algorithm forces each cluster to adapt the ... clusters, and fuzzy clustering is often better suited for the data In this way, data on the boundaries between several clusters are not forced to belong to one of the clusters 2.1 Fuzzy Clustering ... computations for each adjacent pair of components present in the signal indicated by subscript n The value of the measure Ri will be close to one for good performing TFDs and zero for poor performing...
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Báo cáo hóa học: " Research Article High-Resolution Time-Frequency Methods’ Performance Analysis" docx
... its performance at the intersections Yet another test case is adopted from Boashash [15] to compare the TFDs’ performance at the middle of the signal duration interval by the Boashash’s performance ... resolution and concentrated time-frequency distributions: a review,” EURASIP Journal on Advances in Signal Processing, vol 2009, Article ID 673539, 43 pages, 2009 [3] B Boashash, Time-Frequency Signal ... concentration performance measures Ri (64) and Cn (64) A TFD that, at a given time instant, has the largest positive value (close to 1) of the measure Ri is the TFD with the best resolution performance...
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Báo cáo hóa học: " Research Article Video Frames Reconstruction Based on Time-Frequency Analysis and Hermite Projection Method" docx
... illustration of stationary and nonstationary blocks in a sequence of frames (box 1-stationary block, box 2-nonstationary block) Video Analysis and Reconstruction Using Time-Frequency Representations and ... 120 60 120 Time (frames) M −1 xM (t) = 60 q > 0, 3.2 Hermite Projection -Based Temporal Reconstruction of Nonstationary Pixels within the Sequence of Video Frames The Hermite functions are used as ... Section 3, the reconstruction procedure based on the Hermite projection method is proposed In Section 4, the proposed method is applied to the examples Concluding remarks are given in Section Theoretical...
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Báo cáo sinh học: " Research Article Time-Frequency Data Reduction for Event Related Potentials: Combining Principal Component Analysis and Matching Pursuit" pot
... [35], independent component analysis (ICA) [1, 36], and principal component analysis (PCA) [37–40] to extract time-frequency features for classification purposes or for reducing the time-frequency ... new data reduction method based on applying matching pursuit decomposition to the time-frequency domain principal components to further reduce the information from the principal components and ... review of time-frequency distributions and various matching pursuit approaches Section introduces the data reduction method proposed in this paper, combining principal component analysis with matching...
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Báo cáo sinh học: " Research Article Audio Signal Processing Using Time-Frequency Approaches: Coding, Classification, Fingerprinting, and Watermarking" pptx
... signal 0.5 (b) Octave distribution signal 1 Time 0.5 Octaves 10 11 12 13 (h) Figure 9: Comparison of octave distributions Signals and 2: Rock-like signals, and Signals and 4: Classical-like signals ... stage-by-stage implementation and analysis of three important audio processing tasks, namely, (1) audio compression, (2) audio classification, and (3) securing audio content using TF approaches The ... of Signal Processing to Audio and Acoustics, pp 127–130, 2003 [45] C Xu, N C Maddage, and X Shao, “Automatic music classification and summarization,” IEEE Transactions on Speech and Audio Processing, ...
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Báo cáo hóa học: " Research Article Computationally Efficient Scale Covariant Time-Frequency Distributions Selin Aviyente" pptx
... √ scale invariance property is K/ t, where K ∈ R √ Proof In order to find h(t) such that h(at) = (1/ a)h(t), we use the scale transform which is defined as [1] Scale Covariant Computationally Efficient ... to be scale covariant, the crossspectrograms that constitute the TFD should each be scale covariant This is a sufficient but not necessary condition The cross-spectrograms will be scale covariant ... 0.1 Normalized frequency Normalized frequency Figure 2: Scale covariant distribution for a Gabor logon and its time-scaled version (a) Scale covariant distribution, (b) Wigner distribution, and...
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Time frequency scale transforms
... Continuous to Discrete Time- Frequency- Scale Transforms 19 2.1 Continuous Transforms 20 2.2 Semi-Discrete Transforms 24 2.3 Discrete Transforms: Frames ... wavelet which defines a continuous time- frequency- scale transform Vψ Then for any σ ∈ L1 (R) such that σ(γ) > 0, CHAPTER FROM CONTINUOUS TO DISCRETE TIME- FREQUENCY- SCALE TRANSFORMS 32 γ ∈ R, ∫ ∞ ∫ −∞ ... signal function f ∈ L2 (R) from its time- frequency- scale transform values (Vψ f )(b, a−j , − aα−j + C) CHAPTER FROM CONTINUOUS TO DISCRETE TIME- FREQUENCY- SCALE TRANSFORMS 44 Once again, we expect...
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