matrix frequency
RSS matrix frequencySort by: Relevance | Date
BAndwidth Expansion of Narrowband Speech Using Non-Negative Matrix Factorization
White Paper This paper presents a novel technique for the estimation of the high frequency components (4-8kHz) of speech signals from narrow-band (0-4 kHz) signals using convolutive Non-Negative Matrix Factorisation (NMF). [11 Jul 2008]
A Multi-Channel Acoustic Echo Canceller Double-Talk Detector Based on a Normalized Cross-Correlation Matrix
White Paper This paper generalizes the idea of normalized cross-correlation vector (single-channel) to the matrix case (multi-channel), derives a frequency-domain version, and shows how to combine both the multi-channel frequency-domain adaptive filter and... [03 Jul 2008]
High Performance Delivered: From Compliance to Competitive Impact Through Radio Frequency Identification
White Paper Accenture RFID/EPC Strategy Matrix helps companies answer these questions. The matrix helps clients identify their immediate course of action - which is most often a response to mandates - and leverage RFID/EPC to achieve long-term competitive... [03 Jul 2008]
Evaluation of Telemedicine Used in a Simulated Disaster Response
White Paper A medical communications matrix was constructed and used throughout the evaluation. The use of high frequency (HF) packet using ham radios is frequency dependent. In June 2000, the Telemedicine Center at the Brody School of Medicine, East Carolina... [03 Jul 2008]
How to Choose the Best Data Capture Technology
White Paper As bar codes became commonplace, companies realized the advantage of carrying more data, leading to new symbologies such as PDF417 and matrix codes that convey far more information, and now radio frequency identification (RFID), which can serve as... [01 May 2008]
Geometrically-Based Potential Energy for Simulating Deformable Objects
White Paper A key feature of this energy formulation is that the corresponding stiffness matrix is approximately constant, which enables fast and stable implicit integration and large deformations. Two schemes are also adopted to accelerate the simulation... [19 Jul 2007]
Integer-Based Constellation Shaping Method for PAPR Reduction in OFDM Systems
White Paper This paper designs a cubic constellation, called the Hadamard constellation, whose boundary is along the bases defined by the Hadamard matrix in the transform domain. In this paper, the problem of reducing the Peak to Average Power Ratio (PAPR) in... [18 Apr 2007]
New Estimation and Equalization Approach for OFDM Under Doppler-Spread Channel
White Paper Then, ICI is canceled by multiplying the inverse matrix of the estimated channel matrix to the received OFDM symbol vector. ICI causes significant degradation of bit error rate characteristics and this influence becomes larger as the carrier... [18 Apr 2007]
Modified SMI Techniques for Frequency Selective Channels in OFDM
White Paper The Sample Matrix Inversion (SMI) algorithm has been widely applied in the filed of adaptive antenna arrays. In some cases, this might not be possible since the known data could not be sufficient to get a stable estimate of both the sample... [14 Apr 2007]
Frequency Domain Equalization of DMT/OFDM Systems With Insufficient Guard Interval
White Paper The authors show that the equalizer matrix is sparse, thus resulting in a low computational complexity. This paper proposes a new, generalized approach for equalization of Discrete Multi-Tone (DMT) systems, which not only uses redundancy in the... [14 Apr 2007]
MIMO-OFDM Channel Estimation Based on Subspace Tracking
White Paper This algorithm uses the optimum low-rank channel approximation obtained by tracking the frequency autocorrelation matrix of the channel response. The coefficients corresponding to dominant eigenvectors of the autocorrelation matrix are estimated... [13 Apr 2007]
Maximum Achievable Diversity for MIMO-OFDM Systems With Arbitrary Spatial Correlation
White Paper This paper shows that the maximum achievable diversity order is the rank of the spatial correlation matrix of the channel including all delay paths. The paper also shows that any space-frequency code designed to achieve full diversity in spatially... [13 Apr 2007]
Generalization of Single-Carrier and Multicarrier Cyclic Prefixed Communication
White Paper By exploiting the fact that a Circulant Matrix (CM) is also a Block Circulant Matrix (BCM), the proposed Generalized Cyclic Prefixed (GCP) communication system provides an additional degree of freedom that allows trade-offs among Peak-to-Average... [11 Apr 2007]
On the Use of Adaptive Loading Algorithms in MIMO-OFDM Systems
White Paper Channel matrix Singular Value Decomposition (SVD) method has been employed in MIMO-OFDM system in order to overcome subchannel interference. In this paper, Optimum adaptive loading algorithms are applied to Multiple-Input Multiple-Output Orthogonal... [11 Apr 2007]
ICI Reduction Method for OFDM Systems
White Paper One method to combat the performance degradation due to ICI is to linearly approximate the channel variation during one OFDM symbol and create a channel matrix which can be used for ICI cancellation. Orthogonal Frequency Division Multiplexing (OFDM... [11 Apr 2007]
