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Signal Processing Letters, IEEE

Issue 9 • Date Sept. 2005

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Displaying Results 1 - 22 of 22
  • Table of contents

    Publication Year: 2005 , Page(s): c1 - c4
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  • IEEE Signal Processing Letters publication information

    Publication Year: 2005 , Page(s): c2
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  • Differential Transmission for Amplify-and-Forward Cooperative Communications

    Publication Year: 2005 , Page(s): 597 - 600
    Cited by:  Papers (61)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (288 KB) |  | HTML iconHTML  

    In this letter, we propose a differential amplify-and-forward (AF) transmission scheme for a two-user cooperative communications system. By efficiently combining signals from both direct and relay links, the proposed scheme provides superior performance compared to those of direct transmissions with either differential detection or coherent detection. While the exact bit-error-rate (BER) formulati... View full abstract»

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  • A New Multipath Interference Mitigation Technique for High-Speed Packet Transmission in WCDMA Downlink

    Publication Year: 2005 , Page(s): 601 - 604
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (192 KB) |  | HTML iconHTML  

    In order to increase throughput using high order data modulations in wide-band code-division multiple-access (WCDMA) downlink, it is necessary to eliminate multipath interferences. In [1] , a multipath interference canceller (MPIC) was proposed, which enables the use of high order modulations in multipath fading channels. However, only packet channels and pilot channels were considered as transmit... View full abstract»

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  • Threshold Region Determination of ML Estimation in Known Phase Data-Aided Frequency Synchronization

    Publication Year: 2005 , Page(s): 605 - 608
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (208 KB) |  | HTML iconHTML  

    This paper studies the performance of the frequency maximum likelihood (ML) estimator of a single tone in Gaussian noise. Two mean-square error (MSE) approximations are first applied and then compared in the case of a known phase offset. The first is proposed by Van Trees [1] and corresponds to the method of interval errors (MIE). The second MSE approximation is proposed by Rife and Boorstyn in [4... View full abstract»

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  • Fast encoding method for vector quantization using modified L2-norm pyramid

    Publication Year: 2005 , Page(s): 609 - 612
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (200 KB) |  | HTML iconHTML  

    The L2-norm pyramid has already been investigated as a promising data structure for the fast search of vector quantization (VQ) encoding in the previous work. Because the distortion at the top level is always tested first when using such a conventional L2-norm pyramid, the top level is most important. In order to enhance the capability of achieving a rejection decision at the... View full abstract»

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  • Subspace Partition Weighted Sum Filters for Image Restoration

    Publication Year: 2005 , Page(s): 613 - 616
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (904 KB) |  | HTML iconHTML  

    The previously proposed partition-based weighted sum (PWS) filters combine vector quantization (VQ) and linear finite impulse response (FIR) Wiener filtering concepts. By partitioning the observation space and applying a tuned Wiener filter to each partition, the PWS is spatially adaptive and has been shown to perform well in noise reduction applications. In this letter, we propose the subspace PW... View full abstract»

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  • Level Selection for Multiscale Fusion of Out-of-Focus Image

    Publication Year: 2005 , Page(s): 617 - 620
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (744 KB) |  | HTML iconHTML  

    Since multiscale decomposition-based image fusion using different levels appears to provide different fusion performance, a novel method of decomposition level selection for out-of-focus image fusion is presented in this letter. This method uses the information related to the energy difference computed from higher band in multiscale decomposition. The proposed method achieves similar fusion result... View full abstract»

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  • Robust AM-FM Features for Speech Recognition

    Publication Year: 2005 , Page(s): 621 - 624
    Cited by:  Papers (31)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (144 KB) |  | HTML iconHTML  

    In this letter, a nonlinear AM-FM speech model is used to extract robust features for speech recognition. The proposed features measure the amount of amplitude and frequency modulation that exists in speech resonances and attempt to model aspects of the speech acoustic information that the commonly used linear source-filter model fails to capture. The robustness and discriminability of the AM-FM f... View full abstract»

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  • On Second-Order Statistics of Log-Periodogram With Correlated Components

    Publication Year: 2005 , Page(s): 625 - 628
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (232 KB) |  | HTML iconHTML  

    We derive an explicit expression for the covariance of the log-periodogram power spectral density estimator for a zero mean Gaussian process. We do not make the assumption that the spectral components of the process are uncorrelated. Applications to spectral estimation and to cepstral modeling in automatic speech recognition are discussed. View full abstract»

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  • The Redundant Discrete Wavelet Transform and Additive Noise

    Publication Year: 2005 , Page(s): 629 - 632
    Cited by:  Papers (58)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (152 KB) |  | HTML iconHTML  

    The behavior under additive noise of the redundant discrete wavelet transform (RDWT), which is a frame expansion that is essentially an undecimated discrete wavelet transform, is studied. Known prior results in the form of inequalities bound distortion energy in the original signal domain from additive noise in frame-expansion coefficients. In this letter, a precise relationship between RDWT-domai... View full abstract»

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  • Relation Between the Filtered Backprojection Algorithm and the Backprojection Algorithm in CT

    Publication Year: 2005 , Page(s): 633 - 636
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (440 KB) |  | HTML iconHTML  

    In this letter, we present a new fan-beam CT formula, based on which we discuss the relation between the filtered backprojection (FBP) algorithm and the backprojection (BP) algorithm. Specifically, the FBP algorithm can be expressed in a series with its first-order approximation being the BP algorithm. As a result, we identify a link between X-ray CT and number theory. View full abstract»

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  • Soft Constraint Satisfaction Multimodulus Blind Equalization Algorithms

    Publication Year: 2005 , Page(s): 637 - 640
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (328 KB) |  | HTML iconHTML  

    In this letter, a new multimodulus algorithm for blind equalization of complex communication channels is derived by solving a constrained optimization problem with relaxation. The intersymbol interference (ISI) optimization and phase-recovery capabilities of the proposed algorithm are analyzed. It is shown from computer simulations that superior performance for the derived algorithm over Lin's alg... View full abstract»

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  • Time Delay Interpolation by System Response Coefficient Ratios

    Publication Year: 2005 , Page(s): 641 - 644
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (200 KB) |  | HTML iconHTML  

    In this letter, we propose a new method of time delay interpolation based on the finite impulse response (FIR) filter coefficient ratios and derived from the Lagrange interpolation coefficients. The proposed method gives an explicit formula for the time delay that requires no frequency-domain transformations, making it suitable for entirely time-domain applications. Simulation results confirm the ... View full abstract»

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  • On Using Exact Joint Diagonalization for Noniterative Approximate Joint Diagonalization

    Publication Year: 2005 , Page(s): 645 - 648
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (152 KB) |  | HTML iconHTML  

    We propose a novel, noniterative approach for the problem of nonunitary, least-squares (LS) approximate joint diagonalization (AJD) of several Hermitian target matrices. Dwelling on the fact that exact joint diagonalization (EJD) of two Hermitian matrices can almost always be easily obtained in closed form, we show how two “representative matrices” can be constructed out of the origina... View full abstract»

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  • On the Impact of Covariance Contamination for Adaptive Detection in Hyperspectral Imaging

    Publication Year: 2005 , Page(s): 649 - 652
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (208 KB) |  | HTML iconHTML  

    Adaptive detection has been a staple in areas such as radar and sonar for a number of years. A key tenet of adaptive detectors is their use of a “noise only” covariance estimate from a secondary data set. When samples bearing the target signal are included in this covariance estimate, it becomes contaminated. The impact of covariance contamination is evaluated for three popular adaptiv... View full abstract»

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  • Semidefinite Relaxation for Detection of 16-QAM Signaling in MIMO Channels

    Publication Year: 2005 , Page(s): 653 - 656
    Cited by:  Papers (68)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (176 KB) |  | HTML iconHTML  

    We develop a computationally efficient approximation of the maximum likelihood (ML) detector for 16 quadrature amplitude modulation (16-QAM) in multiple-input multiple-output (MIMO) systems. The detector is based on a convex relaxation of the ML problem. The resulting optimization is a semidefinite program that can be solved in polynomial time with respect to the number of inputs in the system. Si... View full abstract»

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  • A Hybrid Phase-Based Single Frequency Estimator

    Publication Year: 2005 , Page(s): 657 - 660
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (152 KB) |  | HTML iconHTML  

    The topic of low computational complexity frequency estimation of a single complex sinusoid corrupted by additive white Gaussian noise has received significant attention over the last decades due to the wide applicability of such estimators in a variety of fields. In this letter, we propose a computationally fast and statistically improved hybrid phase-based estimator that outperforms other recent... View full abstract»

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  • IEEE Signal Processing Letters Information for authors

    Publication Year: 2005 , Page(s): 661 - 662
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  • 2006 IEEE International Conference on Multimedia and Expo (ICME)

    Publication Year: 2005 , Page(s): 663
    Save to Project icon | Request Permissions | PDF file iconPDF (642 KB)  
    Freely Available from IEEE
  • International Conference on Image Processing (ICIP 2006)

    Publication Year: 2005 , Page(s): 664
    Save to Project icon | Request Permissions | PDF file iconPDF (591 KB)  
    Freely Available from IEEE
  • IEEE Signal Processing Society Information

    Publication Year: 2005 , Page(s): c3
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    Freely Available from IEEE

Aims & Scope

The IEEE Signal Processing Letters is a monthly, archival publication designed to provide rapid dissemination of original, cutting-edge ideas and timely, significant contributions in signal, image, speech, language and audio processing.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Peter Willett
University of Connecticut
Storrs, CT 06269
peter.willett@uconn.edu