# IEEE Signal Processing Letters

## Filter Results

Displaying Results 1 - 25 of 28
• ### [Front cover]

Publication Year: 2009, Page(s): C1
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• ### IEEE Signal Processing Letters publication information

Publication Year: 2009, Page(s): C2
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Publication Year: 2009, Page(s):923 - 924
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• ### An Effective PAPR Reduction of SFBC-OFDM for Multinode Cooperative Transmission

Publication Year: 2009, Page(s):925 - 928
Cited by:  Papers (8)
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Peak-to-average power ratio (PAPR) regrowth after clipping is one disadvantage of space-frequency block coded orthogonal frequency-division multiplexing (SFBC-OFDM). In this letter, we propose an effective PAPR reduction technique of SFBC-OFDM for multinode cooperative transmission. To reduce PAPR at the source (mobile equipment), the relay applies SFBC encoding, which enables the source to transm... View full abstract»

• ### Interference Suppression for OFDM Systems With Insufficient Guard Interval Using Null Subcarriers

Publication Year: 2009, Page(s):929 - 932
Cited by:  Papers (3)
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Herein proposed is a new frequency domain equalizer (FEQ) to suppress channel induced interference such as ICI and ISI, co-channel interference, and overlaid systems interference. Unlike earlier schemes, this proposed algorithm requires no temporal oversampling nor the use of more than one receive antenna. All the above is achieved by exploiting null subcarriers (a.k.a. virtual/unused/unmodulated ... View full abstract»

• ### Quantization Noise as Superposition of Frequency-Modulated Sinusoids

Publication Year: 2009, Page(s):933 - 936
Cited by:  Papers (6)
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A closed-form deterministic description of the quantization noise introduced by an infinite uniform quantizer as a function of an arbitrary input signal is given. The quantization noise can be regarded as a superposition of frequency-modulated (FM) sinusoids. For a band-limited Gaussian noise input signal, the power density spectrum of the quantization noise is derived. For a discrete-time system,... View full abstract»

• ### An Affine Projection Algorithm With Evolving Order

Publication Year: 2009, Page(s):937 - 940
Cited by:  Papers (33)
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We present a novel affine projection algorithm (APA) which automatically determines its projection order by an evolutionary method. The evolutionary method increases or decreases the projection order by comparing the output error with a threshold. The experimental results show that the proposed algorithm has fast convergence speed and small steady-state error compared to the conventional APA. View full abstract»

• ### A Low-Complexity PAPR Reduction Scheme for SFBC MIMO-OFDM Systems

Publication Year: 2009, Page(s):941 - 944
Cited by:  Papers (39)
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The multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system with space-frequency block coding (SFBC) is an attractive technique due to its robustness for time selective fading channels. However, the SFBC MIMO-OFDM system also inherits from OFDM systems the drawback of high peak-to-average power ratio (PAPR) of the transmitted signal. The selected mapping (SLM... View full abstract»

• ### Feedforward Frameworks to Enhance Decoding in Precoded Multiuser MIMO Systems

Publication Year: 2009, Page(s):945 - 948
Cited by:  Papers (2)
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It is difficult for users in multiuser multiple-input multiple-output (MU-MIMO) systems to obtain co-channel interference (CCI) statistics without user cooperation. We propose a technique through which each user can effectively obtain the statistics of the interference that it experiences in a precoded MU-MIMO system. This allows true maximum-likelihood detection to be performed in place of minimu... View full abstract»

• ### Upper Bound for the Loss of Energy Detection of Signals in Multipath Fading Channels

Publication Year: 2009, Page(s):949 - 952
Cited by:  Papers (7)
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The performance of energy detection under multipath fading is analyzed and compared with locally optimal detection using Pitman's asymptotic relative efficiency. Under the L-tap finite impulse response channel model with zero-mean independent and identically distributed tap coefficients, it is shown that the average performance loss of energy detection is no greater than 50% in sample size for the... View full abstract»

• ### Nonlinear IF Estimation Based on the Pseudo WVD Adapted Using the Improved Sliding Pairwise ICI Rule

Publication Year: 2009, Page(s):953 - 956
Cited by:  Papers (36)
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A method for the instantaneous frequency (IF) estimation of a monocomponent nonlinear frequency modulated (FM) signal based on the pseudo Wigner-Ville distribution (PWVD) with an adaptive window width is presented. In order to improve the IF estimation accuracy, the original sliding pair-wise intersection of confidence intervals (SPICI) rule has been modified. An additional criterion for a proper ... View full abstract»

• ### Aligning Coupled Manifolds for Face Hallucination

Publication Year: 2009, Page(s):957 - 960
Cited by:  Papers (48)
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Many learning-based super-resolution methods are based on the manifold assumption, which claims that point-pairs from the low-resolution representation manifold (LRM) and the corresponding high-resolution representation manifold (HRM) possess similar local geometry. However, the manifold assumption does not hold well on the original coupled manifolds (i.e., LRM and HRM) due to the nonisometric one... View full abstract»

• ### Selective-Tap Blind Dereverberation for Two-Microphone Enhancement of Reverberant Speech

Publication Year: 2009, Page(s):961 - 964
Cited by:  Papers (11)
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In this letter, we propose a novel approach for two-microphone enhancement of speech corrupted by reverberation. Our approach steers computational resources to filter coefficients having the largest impact on the error surface and therefore only updates a subset of coefficients in every iteration. Experimental results carried out in a realistic reverberant setup indicate that the performance of th... View full abstract»

• ### The Resource-Optimized Differentially Modulated Hybrid AF/DF Cooperative Cellular Uplink Using Multiple-Symbol Differential Sphere Detection

Publication Year: 2009, Page(s):965 - 968
Cited by:  Papers (19)
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In multiuser cellular uplinks, cooperating mobiles may share their antennas in order to achieve transmit diversity by forming a virtual antenna array (VAA) in a distributed fashion. In this paper, based on the minimum BER criterion, we investigate cooperating-user-selection (CUS) and adaptive-power-allocation (APA) for two types of differentially modulated cooperative cellular uplinks requiring no... View full abstract»

• ### Fast Generalized Eigenvector Tracking Based on the Power Method

Publication Year: 2009, Page(s):969 - 972
Cited by:  Papers (13)
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This letter develops a power method-based algorithm for tracking generalized eigenvectors when stochastic signals having unknown correlation matrices are observed. The proposed approach is based on the fact that the generalized eigenvalue problem is reduced to a standard eigenvalue problem, for which the power method can be easily applied by changing the metric of the vector space. The difficulty ... View full abstract»

• ### SURE-Based Non-Local Means

Publication Year: 2009, Page(s):973 - 976
Cited by:  Papers (119)  |  Patents (1)
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Non-local means (NLM) provides a powerful framework for denoising. However, there are a few parameters of the algorithm-most notably, the width of the smoothing kernel-that are data-dependent and difficult to tune. Here, we propose to use Stein's unbiased risk estimate (SURE) to monitor the mean square error (MSE) of the NLM algorithm for restoration of an image corrupted by additive white Gaussia... View full abstract»

• ### Reliability Analysis for Global Motion Estimation

Publication Year: 2009, Page(s):977 - 980
Cited by:  Papers (4)
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Global motion estimation (GME) is the enabling step for many important video exploitation tasks. In this work, we focus on indirect GME methods which have low computational complexity. Typically, an indirect GME method has two major steps. The first step is to find point correspondence between frames through local motion search or feature matching. Then, the second step determines global motion pa... View full abstract»

• ### A Nonlinear $L _{1}$-Norm Approach for Joint Image Registration and Super-Resolution

Publication Year: 2009, Page(s):981 - 984
Cited by:  Papers (13)
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This letter proposes a nonlinear L 1-norm approach for joint image registration and super-resolution (SR). Image SR is the fusion of multiple low-resolution (LR) images to produce a high-resolution (HR) image. Conventional SR algorithms are sensitive to the initial registration error and outliers in the LR images. In view of this, we present a new SR method to address these probl... View full abstract»

• ### Distributed Video Coding Based on the Human Visual System

Publication Year: 2009, Page(s):985 - 988
Cited by:  Papers (3)
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This letter proposes a distributed video coding (DVC) scheme based on the human visual system (HVS). As we know, HVS can seldom sense any changes below the just-noticeable-difference (JND) distortion threshold due to its underlying sensitivity and masking property. Therefore, the un-noticeable signal differences between the original frame and side information need not to be corrected in DVC. Exper... View full abstract»

• ### Semi-Supervised Learning Model Based Efficient Image Annotation

Publication Year: 2009, Page(s):989 - 992
Cited by:  Papers (8)
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Automatic image annotation is a promising way to achieve more effective image management and retrieval. However, system performances of the existing state-of-the-art keyword annotation schemes are often not so satisfactory. Therefore, image annotation refinement is crucial to improve the imprecise annotation results. In this paper, a novel approach is developed to automatically annotate image cont... View full abstract»

• ### Circularity and Gaussianity Detection Using the Complex Generalized Gaussian Distribution

Publication Year: 2009, Page(s):993 - 996
Cited by:  Papers (25)  |  Patents (1)
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Knowing the statistical properties of a complex-valued signal is important in many signal processing applications by providing the necessary information for choosing the appropriate algorithm. In this paper, we provide generalized likelihood ratio tests (GLRT), based on the complex generalized Gaussian distribution (CGGD), for detecting two important signal properties: 1) the circularity of a comp... View full abstract»

• ### A Frequency/Detector Pruning Approach for Loudness Estimation

Publication Year: 2009, Page(s):997 - 1000
Cited by:  Papers (3)  |  Patents (1)
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In this letter, we propose a frequency and detector pruning approach for reducing the computational complexity associated with loudness estimation. The frequency pruning approach exploits the principles of psychoacoustics such that the total neural activity is preserved. The detector pruning approach evaluates the excitation/loudness patterns at nonuniform sample locations and employs signal inter... View full abstract»

• ### On the Improvability and Nonimprovability of Detection via Additional Independent Noise

Publication Year: 2009, Page(s):1001 - 1004
Cited by:  Papers (12)
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Addition of independent noise to measurements can improve performance of some suboptimal detectors under certain conditions. In this letter, sufficient conditions under which the performance of a suboptimal detector cannot be enhanced by additional independent noise are derived according to the Neyman-Pearson criterion. Also, sufficient conditions are obtained to specify when the detector performa... View full abstract»

Publication Year: 2009, Page(s):1005 - 1006
Cited by:  Papers (4)
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Recently, a fast radix-q algorithm for an efficient computation of the type-IV discrete cosine transform (DCT-IV) has been proposed in , where q is an odd positive integer. In particular, based on the proposed fast algorithm, optimized efficient 3-, 5-, and 9-point scaled DCT-IV (SDCT-IV) modules have been derived in . As a response, an improved efficient optimized 9-point scaled DCT-IV (SDCT-IV) ... View full abstract»

• ### Approximate ML Doppler Spread Estimation Over Flat Rayleigh Fading Channels

Publication Year: 2009, Page(s):1007 - 1010
Cited by:  Papers (9)
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The maximum likelihood (ML) Doppler spread estimator provides an accurate estimation performance; however, it results in a much higher computation cost. In this work, we propose a time-domain approximate-ML estimator that significantly reduces the computational complexity of the ML estimator over a flat Rayleigh fading channel. Simulation results show that the proposed method nearly achieves the e... View full abstract»

## 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.

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## Meet Our Editors

Editor-in-Chief
James E. Fowler
Dept Electrical & Computer Engineering
Associate Director
Distributed Analytics and Security Institute
Mississippi State University
Mississippi State, MS 39762 USA
fowler@ece.msstate.edu