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Signal Processing Magazine, IEEE

Issue 5 • Date September 2008

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Displaying Results 1 - 18 of 18
  • Front cover - IEEE Signal Processing Magazine - Sept. 2008

    Publication Year: 2008 , Page(s): c1
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  • Table of contents - Vol 25 No 5

    Publication Year: 2008 , Page(s): 1
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  • A window to the SP community [From the Editor]

    Publication Year: 2008 , Page(s): 2 - 4
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  • A look at the Technical Activities Board [President's Message]

    Publication Year: 2008 , Page(s): 6 - 13
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  • Top downloads in IEEE Xplore [Reader's Choice]

    Publication Year: 2008 , Page(s): 8 - 13
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  • Discriminative learning in sequential pattern recognition

    Publication Year: 2008 , Page(s): 14 - 36
    Cited by:  Papers (41)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1108 KB) |  | HTML iconHTML  

    In this article, we studied the objective functions of MMI, MCE, and MPE/MWE for discriminative learning in sequential pattern recognition. We presented an approach that unifies the objective functions of MMI, MCE, and MPE/MWE in a common rational-function form of (25). The exact structure of the rational-function form for each discriminative criterion was derived and studied. While the rational-function form of MMI has been known in the past, we provided the theoretical proof that the similar rational-function form exists for the objective functions of MCE and MPE/MWE. Moreover, we showed that the rational function forms for objective functions of MMI, MCE, and MPE/MWE differ in the constant weighting factors CDT (s1 . . . sR) and these weighting factors depend only on the labeled sequence s1 . . . sR, and are independent of the parameter set - to be optimized. The derived rational-function form for MMI, MCE, and MPE/MWE allows the GT/EBW-based parameter optimization framework to be applied directly in discriminative learning. In the past, lack of the appropriate rational-function form was a difficulty for MCE and MPE/MWE, because without this form, the GT/EBW-based parameter optimization framework cannot be directly applied. Based on the unified rational-function form, in a tutorial style, we derived the GT/EBW-based parameter optimization formulas for both discrete HMMs and CDHMMs in discriminative learning using MMI, MCE, and MPE/MWE criteria. The unifying review provided in this article has been based upon a large number of earlier contributions that have been cited and discussed throughout the article. Here we provide a brief summary of such background work. Extension to large-scale speech recognition tasks was accomplished in the work of [59] and [60]. The dissertation of [47] further improved the MMI criterion to that of MPE/MWE. In a parallel vein, the work of [20] provided an alternative approach to that of [41], with an attempt to more rigorously provide - - a CDHMM model re-estimation formula that gives positive growth of the MMI objective function. A crucial error of this attempt was corrected in [2] for establishing an existence proof of such positive growth. The main goal of this article is to provide an underlying foundation for MMI, MCE, and MPE/MWE at the objective function level to facilitate the development of new parameter optimization techniques and to incorporate other pattern recognition concepts, e.g., discriminative margins [66], into the current discriminative learning paradigm. View full abstract»

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  • Single-carrier frequency domain equalization

    Publication Year: 2008 , Page(s): 37 - 56
    Cited by:  Papers (76)  |  Patents (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1194 KB) |  | HTML iconHTML  

    This paper present an alternative promising approach to ISI mitigation by the use of single-carrier (SC) modulation combined with frequency-domain equalization (FDE). View full abstract»

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  • Finite-state Markov modeling of fading channels - a survey of principles and applications

    Publication Year: 2008 , Page(s): 57 - 80
    Cited by:  Papers (64)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2067 KB) |  | HTML iconHTML  

    This article's goal is to provide an in-depth understanding of the principles of FSMC modeling of fading channels with its applications in wireless communication systems. While the emphasis is on frequency nonselective or flat-fading channels, this understanding will be useful for future generalizations of FSMC models for frequency-selective fading channels. The target audience of this article include both theory- and practice-oriented researchers who would like to design accurate channel models for evaluating the performance of wireless communication systems in the physical or media access control layers, or those who would like to develop more efficient and reliable transceivers that take advantage of the inherent memory in fading channels. Both FSMC models and flat-fading channels will be formally introduced. FSMC models are particulary suitable to represent and estimate the relatively fast flat-fading channel gain in each subcarrier. View full abstract»

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  • Distributed synchronization in wireless networks

    Publication Year: 2008 , Page(s): 81 - 97
    Cited by:  Papers (52)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1199 KB) |  | HTML iconHTML  

    This article has explored history, recent advances, and challenges in distributed synchronization for distributed wireless systems. It is focused on synchronization schemes based on exchange of signals at the physical layer and corresponding baseband processing, wherein analysis and design can be performed using known tools from signal processing. Emphasis has also been given on the synergy between distributed synchronization and distributed estimation/detection problems. Finally, we have touched upon synchronization of nonperiodic (chaotic) signals. Overall, we hope to have conveyed the relevance of the subject and to have provided insight on the open issues and available analytical tools that could inspire further research within the signal processing community. View full abstract»

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  • 3-D shape modeling for hearing aid design [Applications Corner]

    Publication Year: 2008 , Page(s): 98 - 102
    Cited by:  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1302 KB) |  | HTML iconHTML  

    Advances in 3-D scanning and fabrication hardware as well as 3-D geometric design software have transformed a once laborintensive manual manufacturing into an efficient digital process for hearing aid design, resulting in higher quality, reduced cost, and better fitting devices. Future work in this field will continue to focus on increasing automation until the process is fully automatic. View full abstract»

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  • Signal processing challenges in cognitive assistive technology [Exploratory DSP]

    Publication Year: 2008 , Page(s): 103 - 108
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (936 KB) |  | HTML iconHTML  

    Technological supports for people with disabilities are usually referred to as assistive technology. There has been significant work in developing technologies to support people with mobility and sensory disabilities. Developing these tools for people with cognitive disabilities has not been as widespread. In this article, we briefly outline causes and consequences of cognitive disabilities and then concentrate on smart home technologies. One such challenge in smart homes is the desire to have inexpensive components easily installed and selfcalibrating. We briefly mention work in brain-computer interfaces (BCIs). View full abstract»

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  • Network multicast with network coding [Lecture Notes]

    Publication Year: 2008 , Page(s): 109 - 112
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (403 KB) |  | HTML iconHTML  

    Network coding is a powerful technique introduced at the turn of the millennium, when a simple but far-reaching observation was made that, in communication networks, one can allow intermediate nodes to not only forward but also combine and process the incoming information flows [1]. Today, the field is attracting significant interest from engineers, computer scientists, and mathematicians in both academia and industry, and we are beginning to see first practical applications. In this article, we explain basic ideas, concepts, and power of network coding in a particular traffic scenario of network multicast. View full abstract»

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  • Precise variable-Q filter design [DSP Tips & Tricks]

    Publication Year: 2008 , Page(s): 113 - 119
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (194 KB) |  | HTML iconHTML  

    In this article, it describe two ways to implement a variable-Q digital filter. First, present a simple variable-Q filter and then illustrate why its frequency response is less than ideal. Next, show a trick to modify that filter, making its performance nearly ideal. As always, the choice of which filter to use is made based on the user's application. View full abstract»

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  • The ultra wideband WiMedia standard [Standards in a Nutshell]

    Publication Year: 2008 , Page(s): 115 - 119
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (309 KB) |  | HTML iconHTML  

    This article briefly describes the WiMedia standard - the architecture, the technologies deployed in the standard, the applications enabled by it - and compares WiMedia to existing wireless local area network (WLAN) and wireless personal area network (WPAN) standards. View full abstract»

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  • Sunny San Diego hosts ICIP 2008 [Conference Spotlight]

    Publication Year: 2008 , Page(s): 120 - 125
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  • Ultra Wideband Signals and Systems in Communication Engineering (Ghavami, M. et al.; 2007) [Book Review]

    Publication Year: 2008 , Page(s): 122 - 123
    Cited by:  Papers (2)
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  • Dates Ahead (2008-2009)

    Publication Year: 2008 , Page(s): 124
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  • Auxetic materials for bioprostheses [In the Spotlight]

    Publication Year: 2008 , Page(s): 128 - 126
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (369 KB) |  | HTML iconHTML  

    In this paper, the properties of auxetic materials, their biomedical (bioprostheses) and signal processing applications are discussed. Materials with negative values of the Poisson's ratio (NPR) are referred to as auxetic. View full abstract»

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Aims & Scope

IEEE Signal Processing Magazine publishes tutorial-style articles on signal processing research and applications, as well as columns and forums on issues of interest.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Min Wu
University of Maryland, College Park
United States 

http://www/ece.umd.edu/~minwu/