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# IEEE Signal Processing Letters

## Filter Results

Displaying Results 1 - 25 of 36
• ### Front Cover

Publication Year: 2012, Page(s): C1
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• ### IEEE Signal Processing Letters publication information

Publication Year: 2012, Page(s): C2
| PDF (131 KB)

Publication Year: 2012, Page(s):597 - 598
| PDF (162 KB)
• ### Distributed STBC With Soft Information Relay Based on Gaussian Approximation

Publication Year: 2012, Page(s):599 - 602
Cited by:  Papers (4)
| | PDF (1204 KB) | HTML

We consider a system where the source transmits signals to the destination via two-relays where distributed space time block codes (STBC) are used. It is assumed that the signals are coded at the source and decoded at the relays. In the general case, the decoding at relays might not be perfect and hence the soft information is forwarded. Considering the independent Rayleigh channels and using the ... View full abstract»

• ### New Fuzzy Texture Features for Robust Detection of Moving Objects

Publication Year: 2012, Page(s):603 - 606
Cited by:  Papers (15)
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Robust detection of moving objects in presence of dynamic backgrounds is yet a challenging problem. In this letter, we propose a fuzzy membership transformation to be applied on the co-occurrence vector to derive a rich fuzzy transformed co-occurrence vector with shared membership values in a reduced dimensionality vector space. Fuzzy statistical texture features, derived from this fuzzy transform... View full abstract»

• ### One-Bit Measurements With Adaptive Thresholds

Publication Year: 2012, Page(s):607 - 610
Cited by:  Papers (19)
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We introduce a new method for adaptive one-bit quantization of linear measurements and propose an algorithm for the recovery of signals based on generalized approximate message passing (GAMP). Our method exploits the prior statistical information on the signal for estimating the minimum-mean-squared error solution from one-bit measurements. Our approach allows the one-bit quantizer to use threshol... View full abstract»

• ### Time-Series Dimensionality Reduction via Granger Causality

Publication Year: 2012, Page(s):611 - 614
Cited by:  Papers (1)
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We deal with the problem of time-series prediction in a dyadic setup where the goal is to predict future values of the output sequence from the observed input sequence. Often the input time-series data is high-dimensional with potential noisy measurements included, which can make the prediction task difficult. In this paper, we propose a novel dimensionality reduction algorithm that can sparsely e... View full abstract»

• ### Perfect Gaussian Integer Sequences of Odd Prime Length

Publication Year: 2012, Page(s):615 - 618
Cited by:  Papers (17)
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A Gaussian integer is a complex number whose real and imaginary parts are both integers. A Gaussian integer sequence is called perfect (odd perfect) if the out-of-phase values of the periodic (odd periodic) autocorrelation function are equal to zero. In this letter, for any odd prime p, using the cyclotomic classes of order 2 and 4 with respect to GF(p), we propose perfect and odd perfect Gaussian... View full abstract»

• ### Unsupervised Segmentation of Random Discrete Data Hidden With Switching Noise Distributions

Publication Year: 2012, Page(s):619 - 622
Cited by:  Papers (12)
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Hidden Markov models are very robust and have been widely used in a wide range of application fields; however, they can prove some limitations for data restoration under some complex situations. These latter include cases when the data to be recovered are nonstationary. The recent triplet Markov models have overcome such difficulty thanks to their rich formalism, that allows considering more compl... View full abstract»

• ### A Technique to Compute Smooth Amplitude, Phase, and Frequency Modulations From the Analytic Signal

Publication Year: 2012, Page(s):623 - 626
Cited by:  Papers (2)
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Gabor's analytic signal (AS) is a unique complex signal corresponding to a real signal, but in general, it admits infinitely-many combinations of amplitude and frequency modulations (AM and FM, respectively). The standard approach is to enforce a non-negativity constraint on the AM, but this results in discontinuities in the corresponding phase modulation (PM), and hence, an FM with discontinuitie... View full abstract»

• ### Integrating Binary Mask Estimation With MRF Priors of Cochleagram for Speech Separation

Publication Year: 2012, Page(s):627 - 630
Cited by:  Papers (2)
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In present binary masking based speech separation systems, it is almost impossible to obtain the ideal binary mask (IBM). The error in IBM estimation usually results in energy absence in many speech-dominated time-frequency (T-F) units. It violates smooth evolution nature of the speech signal and creates great artefacts. Markov random field (MRF) is one of the promising approaches to model smooth ... View full abstract»

• ### Stagewise K-SVD to Design Efficient Dictionaries for Sparse Representations

Publication Year: 2012, Page(s):631 - 634
Cited by:  Papers (17)
| | PDF (941 KB) | HTML

The problem of training a dictionary for sparse representations from a given dataset is receiving a lot of attention mainly due to its applications in the fields of coding, classification and pattern recognition. One of the open questions is how to choose the number of atoms in the dictionary: if the dictionary is too small then the representation errors are big and if the dictionary is too big th... View full abstract»

• ### Anti-Jamming GPS Receiver With Reduced Phase Distortions

Publication Year: 2012, Page(s):635 - 638
Cited by:  Papers (30)
| | PDF (680 KB) | HTML

Anti-jamming techniques are critical to maintain the integrity and functionality of GPS systems in various applications. One of the major problems with existing array-based anti-jamming GPS receivers is the errors introduced in the carrier phase, affecting the GPS solution. In this letter, we propose a novel anti-jamming GPS receiver structure that preserves the GPS signal phase continuity. The ef... View full abstract»

• ### A Seismic-Based Feature Extraction Algorithm for Robust Ground Target Classification

Publication Year: 2012, Page(s):639 - 642
Cited by:  Papers (4)
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Seismic signal is widely used in ground target classification due to its inherent characteristics. However, its propagation is highly dependent on local underlying geology. It means that nearly every one geographical environment requires a unique classifier. To resolve the problem, this paper presents a robust feature extraction method Log-Sigmoid Frequency Cepstral Coefficients (LSFCC) which evol... View full abstract»

• ### Joint CFO and Channel Estimation for Asynchronous Cooperative Communication Systems

Publication Year: 2012, Page(s):643 - 646
Cited by:  Papers (5)
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This letter addresses the joint maximum likelihood carrier frequency offset (CFO) and channel estimation for asynchronous cooperative communication systems. We first present a space-alternating generalized expectation-maximization (SAGE) based iterative estimator (SAGE-IE). Then a low-complexity approximate SAGE-IE (A-SAGE-IE) is developed. Our proposed algorithms decouple the multi-dimensional op... View full abstract»

• ### An Improved Multiband-Structured Subband Adaptive Filter Algorithm

Publication Year: 2012, Page(s):647 - 650
Cited by:  Papers (12)
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Recently, a multiband-structured subband adaptive filter (MSAF) algorithm was proposed to speed up the convergence of the normalized least-mean-square (NLMS) algorithm. In this letter, we extend this work and propose an improved multiband-structured subband adaptive filter (IMSAF) algorithm to increase the convergence speed of the MSAF, which can also be regarded as a unifying framework for the NL... View full abstract»

• ### Channel Estimation for AF-Type Cooperative OFDM Systems With Low Pilot Overhead

Publication Year: 2012, Page(s):651 - 654
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In amplify-and-forward (AF) type relaying assisted orthogonal frequency division multiplexing (OFDM) systems, channel estimation (CE) is a challenging task due to the increased frequency selectivity caused by the cascaded source-to-relay-to-destination $(Srightarrow Rrightarrow D)$ multipath channel. Typically, such cascaded channe... View full abstract»

• ### Stochastic-Resonance Based Iterative Detection for Serially-Concatenated Turbo Codes

Publication Year: 2012, Page(s):655 - 658
Cited by:  Papers (8)
| | PDF (596 KB) | HTML

In this letter, the concept of multiple serially-concatenated codes is invoked in the context of stochastic resonance (SR), where the achievable performance is improved by increasing noise power. More specifically, the receiver's iterative decoding process is characterized with the aid of extrinsic information transfer (EXIT) charts, such that the SR effect induced by a non-linear component is tak... View full abstract»

• ### Estimation of Rapidly Time-Varying Harmonic Noise for Speech Enhancement

Publication Year: 2012, Page(s):659 - 662
Cited by:  Papers (1)
| | PDF (951 KB) | HTML

Robust speech enhancement relies on the estimation of stationary as well as non-stationary background noise. This contribution presents a novel approach for estimating the short-term power spectral densities (ST-PSDs) of rapidly time-varying harmonic noise as produced, e.g., by cars or motorcycles. The well-known Minimum Statistics algorithm is modified by frequency warping controlled by the funda... View full abstract»

• ### Fragile Bits in Palmprint Recognition

Publication Year: 2012, Page(s):663 - 666
Cited by:  Papers (19)
| | PDF (763 KB) | HTML

Recent years have witnessed a growing interest in developing automatic palmprint recognition methods. Among them, coding-based ones, representing the texture of a palmprint using a binary code, are most prevalent and successful. We find that not all bits in a code map generated by a specific coding scheme are equally consistent. A bit is deemed fragile if its value changes across code maps created... View full abstract»

• ### Low-Complexity Spectrum Shaping for OFDM-Based Cognitive Radio Systems

Publication Year: 2012, Page(s):667 - 670
Cited by:  Papers (10)
| | PDF (828 KB) | HTML

Orthogonal frequency-division multiplexing (OFDM) is an ideal transmission technique for dynamic spectrum access in cognitive radio (CR) systems. In this letter, we propose low-complexity spectrum shaping to enable fast decaying of power spectral sidelobes and enhance spectral compactness for OFDM-based CR systems. Based on a basic scheme mapping antipodal symbol pairs onto adjacent subcarriers, w... View full abstract»

• ### Comments on "Probabilities of false alarm and detection for the NAMF operating in Gaussian clutter"

Publication Year: 2012, Page(s): 671
| | PDF (225 KB) | HTML

In the above-named letter [ibid., vol. 14, no. 11, pp. 864-866, Nov. 2007], Nadarajah derived explicit expressions for the probabilities of false alarm and detection of the normalized adaptive matched filter (NAMF) in Gaussian clutter. However, there is an error in the derivation of the expression for the probability of false alarm. The purpose of this comment is to correct the error. View full abstract»

• ### Loop Reversal Rule in Block Diagram and Signal Flow Graph Manipulation

Publication Year: 2012, Page(s):672 - 675
| | PDF (334 KB) | HTML

We propose a new rule, loop reversal, in block diagram and signal flow graph manipulation (or transformation) that leads to equivalent block diagrams or signal flow graphs from existing ones. It is known that “algebraic loops” can exist in some systems, where different choices of causality end up with different yet equivalent block diagrams or signal flow graphs, in which some are lo... View full abstract»

• ### Fast and Accurate Human Detection Using a Cascade of Boosted MS-LBP Features

Publication Year: 2012, Page(s):676 - 679
Cited by:  Papers (14)
| | PDF (692 KB) | HTML

In this letter, a new scheme for generating local binary patterns (LBP) is presented. This Modified Symmetric LBP (MS-LBP) feature takes advantage of LBP and gradient features. It is then applied into a boosted cascade framework for human detection. By combining MS-LBP with Haar-like feature into the boosted framework, the performances of heterogeneous features based detectors are evaluated for th... View full abstract»

• ### Coordinated Direct and Relay Transmission With Linear Non-Regenerative Relay Beamforming

Publication Year: 2012, Page(s):680 - 683
Cited by:  Papers (17)
| | PDF (1029 KB) | HTML

Joint processing of multiple communication flows in wireless systems has given rise to a number of novel transmission techniques, notably the two-way relaying, but also more general traffic scenarios, such as coordinated direct and relay (CDR) transmissions. In a CDR scheme the relay has a central role in managing the interference and boosting the overall system performance. In this letter we cons... 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.

Full Aims & Scope

## 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