By Topic

Communications, Computers and Signal Processing, 1999 IEEE Pacific Rim Conference on

Date 22-24 Aug. 1999

Filter Results

Displaying Results 1 - 25 of 153
  • 1999 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM 1999). Conference Proceedings (Cat. No.99CH36368)

    Save to Project icon | Request Permissions | PDF file iconPDF (584 KB)  
    Freely Available from IEEE
  • Author's index

    Page(s): 0_3 - 0_5
    Save to Project icon | Request Permissions | PDF file iconPDF (173 KB)  
    Freely Available from IEEE
  • Multiple input/multiple output (MIMO) equalization for space-time block coding

    Page(s): 341 - 344
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB)  

    In this paper, we propose to combine space-time block codes (ST-BC) with multiple input multiple output equalizer (MIMO-EQ) for achieving transmit diversity in a frequency selective Rayleigh fading channel. In the proposed system, MIMO-EQ equalizes the channel into a temporal intersymbol interference (ISI)-free channel, and then a simple linear processing is used to perform the maximum likelihood (ML) decoding for ST-BC. Our simulation results show that the proposed system can achieve the full spatial diversity gain View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Navigational integration of autonomous Web information sources by mobile users

    Page(s): 270 - 275
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (500 KB)  

    This paper presents a new style of integration called navigational integration for mobile users to integrate several information sources in the WWW framework. We illustrate basic ideas of the navigational integration and describe a design of a system architecture that executes the navigational integration View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • New design approach for polynomial-based interpolation

    Page(s): 544 - 547
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (228 KB)  

    Polynomial-based interpolation techniques are an attractive approach for discrete-time processing of continuous-time signals. These techniques are employing discrete time filters for enabling arbitrary resampling of a time series, and have been used in several applications. In this contribution we investigate and analyze some new design methods and possible applications of this polynomial-based interpolation utilizing the Farrow structure View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • New resource reservation architecture with user interactions

    Page(s): 456 - 459
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (360 KB)  

    We present an architecture for end-to-end resource reservations with user interactions. This architecture is based on domain agents, where in each network domain there is a domain agent. The domain agent is responsible for making immediate and advance resource reservations, then adapting the reserved resources according to user interactions. We also present an architecture for domain agents that facilitate the communications of domain agents with the receivers, senders and routers. It contains a QoS routing agent, to construct QoS intra-domain paths View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Embedded memory in FPGAs: recent research results

    Page(s): 292 - 296
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    Recent dramatic improvements in integrated circuit fabrication technology have led to field-programmable gate arrays (FPGAs) capable of implementing entire digital systems. Unlike the smaller circuits that have traditionally been targeted to FPGAs, these large systems often contain memory. Architectural support for the efficient implementation of memory in next-generation FPGAs is therefore crucial. In this paper, we will describe recent research into FPGA memory architectures. We seek to uncover not only the best architecture for the memory arrays themselves, but the best architecture for their interconnection, and the interconnection of the memory architecture to the rest of the FPGA. We also show how memory arrays that are not used to implement storage can be used to implement the logic parts of circuits very efficiently. Many of the early research results have already been used in commercial FPGAs; others are likely to be used in the future View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance driven coefficient optimization for high throughput energy efficient digital matched filter design

    Page(s): 321 - 324
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (348 KB)  

    A high throughput energy efficient digital matched filter design method for low power communication systems is presented. The filter coefficients are designed to optimize spectral concentration in the transmission bandwidth of the channel with zero intersymbol interference while minimizing the energy dissipation. The optimum matched filter coefficients are searched from the discrete powers-of-two number space and each of the coefficients are restricted to contain at most a finite number of nonzero bits to reduce power dissipation and to increase throughput View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A MDL approach for determining the number of emitters using intra-pulse information

    Page(s): 548 - 551
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (324 KB)  

    In electronic support measures (ESM) systems, intra-pulse analysis has attracted much interest because of its ability to handle complex signal environment. In this paper, we propose an approach for detecting the number of emitters using intra-pulse information. The approach is based on the application of the information theoretic criteria. It has the advantage of not requiring any threshold setting according to some subjective judgment, thus reducing the amount of human intervention for an autonomous ESM system. The algorithm is computationally efficient and suitable for real-time applications. Computer simulations are used to demonstrate the effectiveness of the approach View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Capacity and performance of multiple-input multiple-output wireless systems in a cellular context

    Page(s): 516 - 519
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    The use of multiple element antennas-both transmitting and receiving-has great potential for increasing the capacity of wireless systems. The capacity is derived as a function of the eigenvalues of the channel matrix and computed for an “edge-excited cell” with 3 base sites and a subscriber terminal with a 3 element array, for line-of-sight channels. In an attempt to approach this capacity, we use a blind source separation technique at the receiver. We show that the multiple-input multiple-output system, implemented with such innovative signal processing, offers great enhanced capacity compared to conventional single-input single-output (SISO) systems View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Probabilistic IP verification

    Page(s): 305 - 308
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    Modern VLSI CAD makes intensively use of core based design and integration of Intellectual Property (IP) to handle the IC design complexity. Several methods for IP integration in today's design flow have been proposed. In this paper we present a new model for verification of designs using IP. We make use of probabilistic algorithms to verify a circuit. Our model allows the IP owners and creators to keep all detailed information about the design, while the designer can probabilistically verify his design View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Network efficiency for wireless Internet access

    Page(s): 225 - 229
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (392 KB)  

    It is foreseeable that more and more data traffic generated by interactive application will be carried by the current mobile cellular networks, which is currently dominated by circuit based voice calls. In this paper we propose to use network efficiency, which considers both revenue and network cost as criteria to dimension bandwidth between real-time service and best effort service. Optimized network efficiency reserves some bandwidth for best-effort services, while real-time traffic enjoys preemptive priority beyond the reserved bandwidth. The reservation for best-effort traffic has special significance for users accessing the Internet via a radio link View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • SBDD variable reordering based on probabilistic and evolutionary algorithms

    Page(s): 381 - 387
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (524 KB)  

    Modern CAD tools must represent large Boolean functions compactly in order to obtain reasonable runtimes for synthesis and verification. The shared binary decision diagram (SBDD) with negative edge attributes can represent many functions in a compact form if a proper variable ordering is used. In this work we describe a technique for reordering the variables in an SBDD to reduce the size of the data structure. A common heuristic for the variable ordering problem is to group variables together that have similar characteristics. We use this heuristic to formulate a technique for the reordering problem using probability based metrics. Our results indicate that this technique outperforms sifting with comparable runtimes. Furthermore, the method is robust in that the final results independent of the initial structure of the SBDD View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An adaptive noise-predictive decision-feedback equalizer for the magnetic recording channel

    Page(s): 560 - 563
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (316 KB)  

    An adaptive noise-predictive decision-feedback equalizer (DFE) for a read channel is described. This decision-feedback equalizer uses a recursive filter to whiten the noise at the input of the decision slicer, increasing the detection signal-to-noise ratio. The noise-predictive filter works in conjunction with the DFE to cancel postcursor intersymbol interference. A scheme for adapting the finite-impulse-response forward equalizer, feedback equalizer, and noise-predictive filter is presented. This read channel can perform better than a DFE with a FIR or an all-pass forward equalizer View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multi-channel multi-point distribution service system transceiver implementation

    Page(s): 242 - 245
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (344 KB)  

    This paper presents the hardware implementation of a high-speed transceiver to be used in a multi-channel multi-point distribution system (MMDS). Based on standards specifications, various building blocks are implemented using FPGA prototypes. It has been found that data integrity protection is expensive to implement, namely the forward error correction scheme in the transceiver. This includes Reed-Solomon codec and byte interleaving to correct both random and burst errors causing by the channel. Results show a data rate of 80 Mbit/s can be achieved using FPGA prototypes. Higher data rates are expected when final ASICs are developed View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A multi-channel digital receiver for intrapulse analysis and direction-finding

    Page(s): 589 - 592
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (372 KB)  

    A multi-channel digital receiver architecture is studied and its performance is analyzed for electronic warfare applications. It is found that this architecture has excellent performance for the intrapulse analysis and direction-finding of radar signals. Three unique features are identified: (a) both AOA and intrapulse information can be extracted from the same data set; (b) improvement in the quality of intrapulse information is obtained by a simple averaging of the digitized data profiles from all channels; and (c) since both the AOA and intrapulse information are interrelated, the quality of one parameter can be verified by the other in a multipath environment View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Randomly interleaved single parity check product codes

    Page(s): 420 - 423
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB)  

    This paper considers single parity check (SPC) product codes which are randomly interleaved between the dimensions of the code. The aim of the random interleaving is to reduce the number of codewords at minimum distance and potentially improve the minimum distance of the code. The performance is significantly improved with a three or more dimensional interleaved SPC product code View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Flow Initiation and ReServation Tree (FIRST): a new Internet resource reservation protocol

    Page(s): 361 - 364
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (348 KB)  

    The best effort service provided by the current Internet is not suitable for supporting real-time multimedia applications which require quality of service (QoS) guarantees. To provide QoS over the Internet, a reservation mechanism is required to reserve resources along the data-delivery path. In this paper, we give an overview of three Internet reservation protocols: RSVP, ST-2+ and YESSIR, and compare their features. With the aim of combining the advantages of the above reservation protocols, a new reservation protocol called Flow Initiation and ReServation Tree (FIRST) is proposed. The operations of FIRST are explained with a number of examples View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Serial interference cancellation for highly correlated users

    Page(s): 133 - 136
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB)  

    We describe some serial interference cancellation techniques designed for multiple user detection where the users are employing highly correlated waveforms for modulation. Simulation results are presented which indicate that performance is in some circumstances close to that produced by a cross entropy multi-user detector View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A novel intelligent system for defining similar symbols

    Page(s): 197 - 200
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (340 KB)  

    We introduce an expert system for the recognition of any typed or handwritten symbols, then, we describe how a symbol can be represented by another symbol which is formed of only straight line segments. This allows a large number of different styles of handwritten or typed symbols to be mapped into a much smaller number of representations. These representations are used as models for the automatic recognition of symbols. The system uses the structural pattern recognition technique for modeling symbols by a set of straight lines referred to as line segments. The system rotates, scales and thins the symbol, then extracts the symbol strokes. Each stroke is then mapped into line segments. The system is shown to be able to map similar styles of the symbol to the same representation. When the system had some stored models for each symbol (an average of 97 models/symbol), the recognition rate was 95%, and the rejection rate was 16.1%. The system was tested by 5726 handwritten English characters from the Center of Excellence for Document Analysis and Recognition (CEDAR) database View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Application of new Chinese remainder theorems to RNS with two pairs of conjugate moduli

    Page(s): 165 - 168
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (312 KB)  

    The two most important considerations when designing RNS systems are the choices of the moduli sets and the conversion from the residue to the weighted binary system. In this paper, we unite the new progresses in both issues by applying a new general conversion algorithm, the New Chinese Remainder Theorem III, to the recently proposed conjugate moduli sets, which results in a more efficient design for the residue to binary conversion of-the given moduli sets. This more efficient design for the converter will make the conjugate moduli sets more attractive compared to other moduli sets. The result also demonstrates the effectiveness of the New Chinese Remainder Theorems View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dynamic multimedia integration with the WWW

    Page(s): 448 - 451
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (412 KB)  

    This paper presents a novel framework for seamlessly integrating continuous media, such as audio and video, with the World Wide Web (WWW). Continuous Media with the Web (Cmew) enhances the interactivity of continuous media by associating hyperlinks with spatial-temporal parts of the media. The scenario control architecture in Cmew provides flexible and dynamic control over continuous media in multimedia documents. The Cmew media player has been implemented as a Java applet, which enables its use in the current WWW environment View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On page blocks in distributed virtual memory systems

    Page(s): 605 - 607
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (196 KB)  

    We introduce the concept of working set-based page block in distributed virtual memory systems. We show that hit ratio is significantly better than that of conventional systems, where page blocks are formed from neighboring contiguous pages on the disk. Moreover, the choice of some relevant virtual memory parameters, which is usually made by the system manager and is riskier and may affect the efficiency of the system. We show that such choice becomes more reliable by using page blocks View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Extending spectral synthesis of binary streams to sequential circuits

    Page(s): 479 - 482
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (268 KB)  

    In this paper, we introduce the extention of a stream synthesis method, initially born for combinational networks, to the case of sequential circuits. The peculiar feature of the method is the use of spectral analysis techniques based on the DFT to determine a reduced sequence of vectors that enables one to shorten power simulation time at a very limited accuracy penalty. Effectiveness and robustness of the proposed synthesis procedure are demonstrated by the results we have obtained on standard sequential benchmarks for a variety of input streams characterized by different statistics and correlations View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Evaluating power-performance trade-offs of VLSI transceiver architecture for low-energy communication system design

    Page(s): 250 - 253
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (388 KB)  

    A VLSI transceiver power-performance evaluation methodology for low-energy communication system design is presented. Both functional and architectural aspects of the system are modeled. The methodology simultaneously considers system performance and architectural models for the evaluation. Two models are closely linked by a set of common parameters, which affects both the performance and the hardware complexity. In the methodology, various major blocks, including channel coding algorithms, demodulation schemes, and synchronization techniques can be rapidly reconfigured and parameterized. The minimum power dissipation solution is searched by the unidirectional steepest descent method to explore the design solution space. With the presented methodology, rapid evaluation of algorithms and the power consumption are feasible and the design tradeoffs can be made View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.