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2007 IEEE Workshop on Signal Processing Systems

Date 17-19 Oct. 2007

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Displaying Results 1 - 25 of 139
  • [Front cover]

    Publication Year: 2007, Page(s): C1
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  • [Breaker page]

    Publication Year: 2007, Page(s): 1
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  • [Breaker page]

    Publication Year: 2007, Page(s): ii
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  • Contributor listings

    Publication Year: 2007, Page(s):iii - v
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  • General Chair's message

    Publication Year: 2007, Page(s): vi
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  • Technical Program Co-Chairs' message

    Publication Year: 2007, Page(s): vii
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  • [Blank page]

    Publication Year: 2007, Page(s): viii
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  • Table of contents

    Publication Year: 2007, Page(s):ix - xx
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  • Spectrum Sensing Using Cyclostationary Spectrum Density for Cognitive Radios

    Publication Year: 2007, Page(s):1 - 6
    Cited by:  Papers (20)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4604 KB) | HTML iconHTML

    Cognitive radios (CR) are proposed to alleviate the spectrum scarcity problems facing wireless service providers. In US, the FCC is considering spectrum regulation changes by allowing unlicensed operation in the TV broadcast bands provided that no harmful interference is caused. In this paper, we discuss the spectrum sensing aspects of cognitive radios. We particularly focus on the detection metho... View full abstract»

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  • A Wavelet-FFT Based Efficient Sparse OFDMA Demodulator and Its Implementation on VLIW Architecture

    Publication Year: 2007, Page(s):7 - 12
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB) | HTML iconHTML

    In a practical OFDMA system, the terminal receiver often observes very low power in significant number of sub-carriers. The sparse energy distribution is because of the partial-load on sub-carriers, the beam-forming at basestation and the large amount of zero-sub-carriers obligated by communication standards. We present the algorithm and implementation of an energy-scalable OFDMA demodulator explo... View full abstract»

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  • Embedded Reconfigurable Solution for OFDM Detection Over Fast Fading Radio Channels

    Publication Year: 2007, Page(s):13 - 18
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB) | HTML iconHTML

    OFDM demodulation under fast fading radio channels is very computationally demanding, making the implementation of Software Defined Radio (SDR) solutions problematic. A sub-optimal demodulation algorithm based on QR decomposition of blocks of the channel transfer matrix offers near optimal performance at lower computational cost, but hardware support is still needed. We first propose a COordinate ... View full abstract»

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  • Systematic Optimization of Programmable QRD Implementation for Multiple Application Scenarios

    Publication Year: 2007, Page(s):19 - 24
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4737 KB) | HTML iconHTML

    Orthogonal-Triangular Decomposition (QRD) is one of the most fundamental signal processing primitives based on complex matrix operations [1]. It forms the core of many advanced multi-dimension and statistical signal processing algorithms that utilize orthogonalization, projection, and rank-revealing principles. Especially in the domain of wireless signal processing, many emerging algorithms in MIM... View full abstract»

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  • Peak-to-Average Power Ratio Reduction in an FDM Broadcast System

    Publication Year: 2007, Page(s):25 - 30
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3549 KB) | HTML iconHTML

    Digital predistortion is a technique used to reduce the signal dynamic range in a multichannel system in order to improve power amplifier (PA) efficiency. These techniques have been developed for orthogonal frequency-division multi-plexing (OFDM) systems, but are not directly applicable to general frequency-division multiplexing (FDM) systems such as those used in broadcast. A modification to the ... View full abstract»

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  • Multilevel Linc System Design for Power Efficiency Enhancement

    Publication Year: 2007, Page(s):31 - 34
    Cited by:  Papers (1)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3663 KB) | HTML iconHTML

    Linear amplifier with nonlinear components (LINC) is a power amplifier (PA) linearization technique which offers both high PA efficiency and high linearity of wireless transmitters. But at the output stage, LINC uses a power combiner which results in low system efficiency. To solve this problem, we propose a multilevel out-phasing (MOP) scheme and a corresponding architecture, multilevel LINC (MLI... View full abstract»

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  • Layered Steered Space-Time Codes Using Iterative Detection

    Publication Year: 2007, Page(s):35 - 39
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (491 KB) | HTML iconHTML

    This paper presents a novel multifunctional multiple-input multiple-output (MIMO) scheme that combines the benefits of the Vertical Bell Labs Layered Space-Time (V-BLAST) scheme, of Space-Time Codes (STC) as well as of beam-forming. Further system performance improvements can be attained by serially concatenated convolutional encoding combined with a unity-rate code (URC) referred to as a precoder... View full abstract»

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  • Early-Pruning K-Best Sphere Decoder for MIMO Systems

    Publication Year: 2007, Page(s):40 - 44
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3414 KB) | HTML iconHTML

    The sphere decoding algorithm has been used for maximum likelihood detection in MIMO systems, and the K-Best sphere decoding algorithm is proposed for MIMO detections for its fixed complexity and throughput. However, to achieve near-ML performance, the K needs to be sufficiently large, which leads to large computational complexity and power consumption in hardware implementation. In this paper, we... View full abstract»

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  • Low-complexity Prediction Techniques of K-best Sphere Decoding for MIMO Systems

    Publication Year: 2007, Page(s):45 - 49
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3052 KB) | HTML iconHTML

    In multiple-input multiple output (MIMO) systems, maximum likelihood (ML) detection can provide good performance, however, exhaustively searching for the ML solution becomes infeasible as the number of antenna and constellation points increases. Thus ML detection is often realized by K-best sphere decoding algorithm. In this paper, two techniques to reduce the complexity of K-best algorithm while ... View full abstract»

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  • Sphere Decoding for Multiprocessor Architectures

    Publication Year: 2007, Page(s):50 - 55
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (337 KB) | HTML iconHTML

    Motivated by the need for high throughput sphere decoding for multiple-input-multiple-output (MIMO) communication systems, we propose a parallel depth-first sphere decoding (PDSD) algorithm that provides the advantages of both parallel processing and rapid search space reduction. The PDSD algorithm is designed for efficient implementation on programmable multi-processor platforms. We investigate t... View full abstract»

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  • High Speed Look-Ahead LMS Detector for MIMO Systems

    Publication Year: 2007, Page(s):56 - 60
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2120 KB) | HTML iconHTML

    Adaptive MIMO detection is used when knowledge of the channel is unavailable. We propose an efficient look-ahead LMS algorithm for MIMO systems which has no noticeable performance loss compared to the standard LMS procedure. In particular, the additional logic introduced into the feedback path can be retimed to reduce the critical path delay. We illustrate this by implementing both the retimed loo... View full abstract»

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  • Frame Expansion Based Peak to Average Power Ratio Reduction in MIMO OFDM Systems

    Publication Year: 2007, Page(s):61 - 66
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB) | HTML iconHTML

    The integration of Orthogonal Frequency Division Multiplexing (OFDM) into Multiple Input Multiple Output (MIMO) systems is regarded as a promising technology to provide high performance in fourth generation (4G) broadband wireless communication systems. However, the inherent drawback of large Peak-to-Average Power Ratio (PAPR) for OFDM carries over to MIMO systems. This paper examines the use of E... View full abstract»

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  • Systematic Luby Transform Codes and Their Soft Decoding

    Publication Year: 2007, Page(s):67 - 72
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (341 KB) | HTML iconHTML

    Luby Transform codes (LT) were originally designed for the Binary Erasure Channel (BEC) encountered owing to randomly dropped packets in the statistical multiplexing aided classic wireline-based Internet, where transmitted packets are not affected by the fading or noise of the propagation environment of the wireless Internet. For the sake of transmitting data over the BEC routinely encountered in ... View full abstract»

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  • Vector Quantization-Block Constrained Trellis Coded Quantization of Speech Line Spectral Frequencies

    Publication Year: 2007, Page(s):73 - 75
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (211 KB) | HTML iconHTML

    In this paper, a vector quantization-block constrained trellis coded quantization (VQ-BCTCQ) is presented to quantize line spectrum frequency (LSF) parameters of the wideband speech codec. Both the predictive structure and safety-net concept are combined into VQ-BCTCQ to develop the predictive VQ-BCTCQ. The performance of this quantization is compared with that of the linear predictive coding (LPC... View full abstract»

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  • Error Reduction on Automatic Segmentation in Microarray Image

    Publication Year: 2007, Page(s):76 - 81
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3696 KB) | HTML iconHTML

    DNA Microarray hybridization is a popular high throughput technique in academic as well as in industrial genomics research. The Microarray image is considered as an important tool and powerful technology for large-scale gene sequence and gene expression analysis. There are many methods to analyze the Microarray image by automatic segmentation or gridding spot. These methods always have the same pr... View full abstract»

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  • A Novel Real-Time Implementation for Network Echo Cancellation System

    Publication Year: 2007, Page(s):82 - 85
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1963 KB) | HTML iconHTML

    This paper describes a novel structure and its implementation method of a long-distance network echo canceller. The proposed NEC system copes with double talking situations by using a modified double-talk detector. An improved adaptive filter structure is also presented based on algorithm delay estimator. To deal with residual echo after filtering a nonlinear processor is employed. The resulting a... View full abstract»

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  • Initial Image Selection and its Influence on Super-Resolution Reconstruction

    Publication Year: 2007, Page(s):86 - 89
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1156 KB) | HTML iconHTML

    Super-resolution (SR) reconstruction is a technique to yield a higher resolution (HR) image from aliasing low resolution (LR) ones. An LR image is upsampled as the initialization, and then iteratively corrected in comparison with the other LR images. As the solution satisfying the SR constraints is non-unique, it is impossible to recover the original HR details completely by SR techniques. The sol... View full abstract»

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