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Intelligent Signal Processing and Communication Systems, 2007. ISPACS 2007. International Symposium on

Date Nov. 28 2007-Dec. 1 2007

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  • [Front cover]

    Publication Year: 2007 , Page(s): c1
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  • 2007 International Symposium on Intelligent Signal Processing and Communications Systems Proceedings

    Publication Year: 2007 , Page(s): i
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  • [Copyright notice]

    Publication Year: 2007
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  • Welcome mesage from general chair

    Publication Year: 2007 , Page(s): I
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  • Technical program overview

    Publication Year: 2007 , Page(s): II
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  • Organizing Committee

    Publication Year: 2007 , Page(s): III - VIII
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  • Keynote speech 1

    Publication Year: 2007 , Page(s): IX - XII
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    Provides an abstract for each of the keynote presentations and a brief professional biography of each presenter. The complete presentations were not made available for publication as part of the conference proceedings. View full abstract»

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  • Table of contents

    Publication Year: 2007 , Page(s): XIII - XXVI
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  • Performance of Q-ary PCGC based on PEG algorithm

    Publication Year: 2007 , Page(s): 1 - 4
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (496 KB) |  | HTML iconHTML  

    PCGC (Parallel Concatenated Gallager Codes) are a new class of concatenated codes based on component LDPC codes. They show the low complexity of encoding while maintaining a good performance compare to LDPC codes. In this paper we investigate the performance of q-ary PCGC scenario, and the PEG (Progressive Edge-Growth) algorithm is introduced into the design of component parity check matrix. Simulation results show that q-ary PCGC with proper component design on GF(4) are better than the comparable LDPC codes at the short lengths. Meanwhile it is found that PCGC on GF(4) also outperform PCGC on GF(2) with analogous complexity. Finally it is seen that q- ary PCGC can be optimized further through proper component design on GF(q). View full abstract»

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  • Graph representations of BCH codes in frequency domain

    Publication Year: 2007 , Page(s): 5 - 7
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (485 KB) |  | HTML iconHTML  

    A trellis and a Wiberg-like graph for a Bose-Chaudhuri-Hochquenghem (BCH) code in frequency domain are proposed and thus the concept of codes defined on graphs is extended from time domain to frequency domain. And a decoding algorithm on trellis in frequency domain is presented by introducing a concept of syndrome trellis. Finally, Comparisons of graph representations of BCH codes in time domain and frequency domain are also discussed. View full abstract»

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  • A novel approach in network coding based on shuffle coding

    Publication Year: 2007 , Page(s): 8 - 11
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (485 KB) |  | HTML iconHTML  

    Network coding, a new technology that can optimize the usage of network resources is developing rapidly nowadays. In the traditional scheme of network coding, the linear combination with coefficients of bits is used in the coding process. In this paper, we design another coding approach on the basis of random network coding - shuffle coding, which can sharply decline the complexity of the coding process and improve the encoding rate of the coding scheme. In shuffle coding, shifting operation is used instead of coefficients combination compared to the normal network coding, with its operating objects are the data units not the bits. We present a detailed scheme of shuffle coding in the paper, and simulate the whole encoding process on a channels model for evaluation. This kind of network coding is proved to be effective, flexible and advanced, which can be used in large-scale networks in the future. View full abstract»

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  • Quasi-cyclic LDPC codes based on D and Q matrices through progressive edge growth

    Publication Year: 2007 , Page(s): 12 - 15
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (453 KB) |  | HTML iconHTML  

    We propose a general method for constructing regular and irregular quasi-cyclic LDPC codes based on the modified PEG (progressive edge growth) graph. The idea of permutation vector is introduced. Through permutation vectors, the QC-LDPC codes based on arbitrary circulant permutation matrices, which are not limited to identity matrix, Q-matrix or D-matrix, can be generated with flexible parameters such as block length, code rate, degree distribution. Simulation results demonstrate that QC-LDPC codes using the new PEG algorithm show an error correction performance comparable to the random LDPC codes based on the traditional PEG algorithm. In addition, the PEG QC-LDPC codes have more hardware-friendly parity check matrices than the random PEG LDPC codes and can fulfill linear-time encoding. The QC-LDPC codes based on D-matrix and Q-matrix are more suitable to be used in QC-LDPC codes than identity matrix because they outperform that of identity matrix by 0.1-0.2 dB in the new PEG algorithm. View full abstract»

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  • Improved methods for noise spectral estimation and adaptive spectral gain control in noise spectral suppressor

    Publication Year: 2007 , Page(s): 16 - 19
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (510 KB) |  | HTML iconHTML  

    In this paper, new approaches to noise spectrum estimation and spectral gain control are proposed for noise spectral suppressors. First, the speech absent frames are detected by using spectral entropy. In the speech absent frames, a weighting factor used in estimating the noise spectrum is modified so as to emphasize effect of the noisy speech signal. Next, a spectral gain is more reduced by multiplying a factor in order to suppress effects of the noise in the speech absent frames. Furthermore, in the speech present frames, in order to reduce signal distortion, the spectral gain is controlled to be unity based on an SNR calculated by using a ridgeline spectrum. Finally, the original noisy speech is added to the estimated speech in some ratio. This ratio is controlled by the long term averaged SNR of the estimated noise and the noisy speech. Computer simulations by using speech signals, the white noise, the car noise and the bubble noise, which are available in public, have been carried out for the conventional methods and the proposed method. The proposed method can improve a segmental SNR and speech quality compared to the conventional methods. Especially, it is useful for the bubble noise. View full abstract»

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  • On audio recognition performance via robust hashing

    Publication Year: 2007 , Page(s): 20 - 23
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (434 KB) |  | HTML iconHTML  

    In recent years, automated audio recognition is arising as a relevant issue. One of the most successful approaches has proved to be the Philips method [1], by Haitsma et al.. Our work exploits this framework in order to allow for a better tuning of the algorithm. In particular, we show that more accurate hashes do not always lead to a better performance, which can then be attained with an inferior computational cost. A simple and efficient search method is also proposed. View full abstract»

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  • Interactive music synthesis according to the diffractive light from a hologram

    Publication Year: 2007 , Page(s): 24 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (706 KB) |  | HTML iconHTML  

    In this paper we present a hologram-based real-time system which allows the user to interact with music according to the diffractive light from a hologram. The system synthesizes audio with different pitches and tempo in accordance with the variations of the light brightness from a dot matrix hologram, which is composed of many gratings with varied orientations and pitches. Music data are encoded in a 2-D barcode on the hologram. The hologram possesses the "image switching" feature for real-time detection and this feature can affect the tempo of the synthesized music. The results show that this interactive system successfully decodes the barcode and synthesizes audio according to the variations of the diffractive lights from the hologram. This interactive video/audio system has many potential applications to creative music performance, interactive art presentation, e-learning, game development and anti-counterfeiting technology. View full abstract»

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  • On the design of high order digital audio equalizers

    Publication Year: 2007 , Page(s): 28 - 31
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (407 KB) |  | HTML iconHTML  

    This paper presents a new approach for designing high order digital audio equalizer filters. The new design is based on odd order analog allpass filters and bilinear transformation. The analog allpass filters are designed using Butterworth, Chebyshev I, Chebyshev II and elliptic polynomials. The new design results in an efficient structure, i.e., a parallel connection of two stable allpass filters. View full abstract»

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  • Voice conversion using Viterbi algorithm based on Gaussian mixture model

    Publication Year: 2007 , Page(s): 32 - 35
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1103 KB) |  | HTML iconHTML  

    A novel method for voice conversion based on Viterbi algorithm is proposed in this paper, which uses the matrix of transition probabilities of the target speaker to represent the relationship between the subsequent frames, and then determines the most appropriate component of the GMM by utilizing the Viterbi algorithm for each frame of the source speaker. It avoids the spectral discontinuities between adjacent frames and the spectral averaging. Both objective and subjective evaluations have demonstrated that the proposed method improves the performance of the conventional voice conversion system based on GMM. View full abstract»

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  • Evaluation of level crossing rates and fade durations for multihop Nakagami fading channels with an amplify-and-forward relay

    Publication Year: 2007 , Page(s): 36 - 39
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1298 KB) |  | HTML iconHTML  

    The average level crossing rates (LCR) and average fade durations (AFD) are analyzed for the multihop Nakagami fading channel with an amplify-and-forward (AF) relay. To evaluate the average LCR and AFD in closed-forms, their lower bound and upper bound are derived. Numerical results with different values of fading parameters are presented to illustrate the performance. View full abstract»

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  • Chaotic spread-spectrum sequences using chaotic quantization

    Publication Year: 2007 , Page(s): 40 - 43
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (766 KB) |  | HTML iconHTML  

    Chaos is widely used in spread-spectrum communication research work due to its pseudorandom property and high sensitivity to initial value. But when applying chaos to practical spread-spectrum communication, there exists the finite precision problem because of the precision limitation of hardware, which leads chaos to short period. A new method of chaotic quantization is presented in this paper aiming to get better properties as well as overcome the finite precision problem to some extent. And some analysis and simulation result are given to show the advantage of this method to the previous solving methods such as multilevel quantization. View full abstract»

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  • Estimation of electromagnetic parameter of stratum based on Kriging interpolation

    Publication Year: 2007 , Page(s): 44 - 47
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (519 KB) |  | HTML iconHTML  

    The distribution of electromagnetic parameter in stratum is a basis of the design of the through-the-earth communication system and selecting of the equipments' electrical parameters. Because there is great difference of electromagnetic parameter between different geological strata, a great bias will be brought out during the research of the electromagnetic propagation characteristics of the through-the-earth communication based on the simplified stratum media model. In order to solve this problem, Kriging interpolation algorithm is originally adopted to setup a stratified stratum media model and estimate the distribution of the electromagnetic parameters in the mutant stratum media. By this interpolation method, the high precise electromagnetic parameters and stratum media model can be provided for the design of communication system and the numerical calculation of electromagnetic propagation. View full abstract»

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  • A general mobility model for wireless cellular communication

    Publication Year: 2007 , Page(s): 48 - 51
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1491 KB) |  | HTML iconHTML  

    The mobility model of mobile terminals in cellular communication has heavy impact on call admission control (CAC) algorithm. The traditional models have a common defect that a channel is the minimum resource allocation unit which leads to the unsuitability for data communication. However, researches on shared channel in CAC are still lacking. In this article, a general mobility model for cellular communication is put forward and corresponding mathematic formula for admission probability is given. From such model, many mobility models can be derived by combining or decomposing some parameters from different viewpoint. The defect of traditional models is overcome by introducing bandwidth into the model. A methodological idea is also generalized which may be helpful for researching systematic problems such as QoS. View full abstract»

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  • A new non-coherent delay-lock loop

    Publication Year: 2007 , Page(s): 52 - 55
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (484 KB) |  | HTML iconHTML  

    The Tracking, Telemetry and Command (TT&C) systems for space vehicle had gone through two main stages, which were separate systems and carrier unified systems, now its developing trend is advanced Spread Spectrum Unified TT&C(SS-UTTC) systems. The delay-locked is a key technique of Tracking, Telemetry and Command (TT&C) systems. This paper gives a new non-coherent delay-lock loop scheme based on coherent characteristic and analyses its acquisition and tracking performances for Doppler Shift and test the performance in experiment. View full abstract»

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  • Efficient low-latency RC4 architecture designs for IEEE 802.11i WEP/TKIP

    Publication Year: 2007 , Page(s): 56 - 59
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (424 KB) |  | HTML iconHTML  

    In this paper, novel low-latency RC4 implementations with cell-based VLSI design flow are proposed for IEEE 802. Hi WEP/TKIP. The RC4 stream cipher is used in the security protocol WEP in IEEE 802.11 b wireless network, and is also used in the TKIP of wireless network IEEE 802.11i cryptography. The major process of RC4 algorithm is to shuffle the memory continuously. For quick memory shuffling, we investigate two different memory shuffling architectures to design the RC4. By using single-port 128 x 16 memory design, this architecture reduces 25 % shuffling latency, compared with the conventional single-port 256 x 8 architecture. By using dual-port 256 x 8 memory design, this architecture achieves less latency and less power consumption at the same time. Both of the proposed architectures can reduce much latency in comparison with the conventional single-port 256 x 8 memory design. View full abstract»

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  • A high-speed fair scalable scheduling architecture

    Publication Year: 2007 , Page(s): 60 - 63
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (963 KB) |  | HTML iconHTML  

    This paper proposes a high-speed fair scalable scheduling architecture (FSSA) based on input queued switches, which can be implemented on a 64 x 64 scheduler. Compare with the ordinary SSA, the FSSA evenly distributes the starts of new scheduling rounds to different cell times in guarantee of a more balanced scheduling pattern. The simulation results show that the FSSA has a better performance in latency than SSA especially under low traffic load and the synthesis and post simulation results indicate that the data rate of each channel can be up to 800 Mbps. Therefore, the implementation of FSSA is applicable to high-speed scalable switches. View full abstract»

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  • Design of a new portable telemedicine monitoring equipment based on NIOS II

    Publication Year: 2007 , Page(s): 64 - 67
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1235 KB) |  | HTML iconHTML  

    A solution for end-user of the portable telemedicine monitoring equipment has been proposed in this paper. The hardware design scheme adopts SOPC technology based on NIOS II processor. The system modules are implemented on Quartus II V6.0 and have been validated on Altera 1C20 development kit. This paper focuses on the development process of hardware platform. The experimental result indicates that the monitoring system can realize data acquisition, display, storage and transfer functions directly and accurately. View full abstract»

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