1999 IEEE International Conference on Communications (Cat. No. 99CH36311)

6-10 June 1999

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  • 1999 IEEE International conference on Communications [front matter]

    Publication Year: 1999, Page(s):i - xl
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  • Performance evaluation of reverse link for speech and data traffic in CDMA-based IMT-2000

    Publication Year: 1999, Page(s):1409 - 1413 vol.3
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (477 KB)

    In this paper, the bit error rate (BER) performance for the speech and data traffic is evaluated by results of the reverse link simulation of CDMA-based IMT-2000. Simulations in the reverse link are achieved for indoor, pedestrian, and vehicular environments, which are provided by ITU-R. Also, in these simulations, the fast power control of 1.6 kHz rate is applied. The amplitude and phase of the f... View full abstract»

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  • Short range radio based ad-hoc networking: performance and properties

    Publication Year: 1999, Page(s):1414 - 1420 vol.3
    Cited by:  Papers (28)  |  Patents (32)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    The current research and development of short range radio technologies will provide new means to implement ad-hoc networking between cellular phones, notebook computers, and small, low powered devices such as electronic calendars. An industry consortium has recently released preliminary specifications for a short range radio technology named Bluetooth. The Bluetooth radio operates in the unlicense... View full abstract»

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  • Multimedia CDMA wireless network design: the link layer perspective

    Publication Year: 1999, Page(s):1421 - 1425 vol.3
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Multimedia traffic sources with tight latency constraint, arising in sessions such as data query, image and video transmissions, can be very bursty and are inefficient to be serviced with a dedicated high-speed link. On wireline networks, bursty traffic is statistically multiplexed to fully utilize the link capacity. In light of recent proposals for wideband CDMA (WCDMA) to service multimedia data... View full abstract»

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  • Efficient integration of multi-rate traffic for 3rd generation DS-CDMA systems

    Publication Year: 1999, Page(s):1426 - 1430 vol.3
    Cited by:  Papers (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (577 KB)

    We address the issue of efficient integration of multi-rate traffic supported by third generation DS-CDMA systems. We have previously proposed the notion of line rate (adjusted data rate before spreading) to incorporate traffic with a wide range of source rates. Each selected line rate will support a group of multi-rate traffic. We evaluate the impact of line rate(s) selection on the forward link ... View full abstract»

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  • Call admission on the uplink of a CDMA system based on total received power

    Publication Year: 1999, Page(s):1431 - 1436 vol.3
    Cited by:  Papers (21)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    We consider the problem of admitting calls to a CDMA wireless network supporting stream and packet services over a range of transmission rates and offering possibly different grades of service. Resource requirements are considered separately for the uplink and downlink. The high-level objective is to design a simple admission scheme for the uplink that ensures adequate signal-to-interference ratio... View full abstract»

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  • Semi-analytical methodology for assessing CDMA forward link Erlang capacity

    Publication Year: 1999, Page(s):1437 - 1441 vol.3
    Cited by:  Papers (2)
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    Evaluation of forward link Erlang capacity for CDMA systems has been a troublesome issue. (1) CDMA systems do not have hard limitation in traffic channels due to resource partitioning such as frequency reuse, time slot multiplexing etc. (2) CDMA systems allow soft handoff which makes the computation on per cell or per sector basis difficult. Traditional ways to obtain the forward Erlang capacity c... View full abstract»

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  • A distributed dynamic call admission control that supports mobility of wireless multimedia users

    Publication Year: 1999, Page(s):1442 - 1446 vol.3
    Cited by:  Papers (10)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (513 KB)

    We present distributed dynamic reservation (DDR) scheme that supports mobility in the wireless multimedia communications. As the traditional reservation schemes do not fit to handling time-varying multi-class multimedia traffic due to the involved computational complexity, we employ an elaborate two-regional approximation scheme that can reduce the computation dramatically. We approximate the chan... View full abstract»

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  • Prediction based access control in integrated voice/data CDMA systems

    Publication Year: 1999, Page(s):1447 - 1451 vol.3
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (475 KB)

    We propose access control protocols for integrated voice/data CDMA systems that are based on estimating the residual capacity available for data users. The residual capacity is derived from the feasibility condition for power control using an adaptive prediction technique based on delta modulation. The analysis is extended for the case of imperfect power control. Two access control protocols are c... View full abstract»

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  • Next-generation broadband switching router system architecture for future multimedia-oriented Internet: design and analysis

    Publication Year: 1999, Page(s):1452 - 1457 vol.3
    Cited by:  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (563 KB)

    A next-generation broadband switching router system architecture design together with its analytical model for future multimedia-oriented Internet is proposed and analyzed in this paper. We take advantages of both the connection-oriented mode as one basic building module with its own time slot, such as an ATM switch, and the connectionless mode as the other with its own time slot, such as the trad... View full abstract»

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  • Non-blocking folded architectures for multirate ATM switching fabrics

    Publication Year: 1999, Page(s):1458 - 1462 vol.3
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    This paper studies the non-blocking switching operation of one-sided two-stage switching networks in the multirate environment. The analysis done in this paper determines the minimum number of the second stage switches required for the strictly non-blocking operation of such networks. Both sufficient and necessary conditions are proved. We concentrate on the continuous bandwidth case, but results ... View full abstract»

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  • The impact of rate mismatch in ATM switch design

    Publication Year: 1999, Page(s):1463 - 1467 vol.3
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    This paper evaluates the buffer requirements resulting from rate mismatch in a 32/spl times/32 ATM switch with sixty OC-3 (155 Mbps) and four T-1 (1.5 Mbps) ports. Rate mismatch is expected to be a common occurrence in ATM wide area networks, particularly at the network seams. Without proper dimensioning, the switch buffers can rapidly overflow as a result of high-speed input traffic destined to a... View full abstract»

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  • A cost-effective design for ATM switching fabrics

    Publication Year: 1999, Page(s):1468 - 1472 vol.3
    Cited by:  Papers (2)
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    In this paper, we present a cost-effective design for ATM switching fabrics based on multistage structures, which involve no internal buffers at the constituent switching elements (SEs). The design consists of repeated copies of multiple stages of SEs, that are interconnected according to the indirect n-cube connection style between stages and that provide outlets for cells to terminate at their r... View full abstract»

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  • Optical WDM grouped links and dynamic bandwidth sharing for scalable 3-stage ATM switching systems

    Publication Year: 1999, Page(s):1473 - 1477 vol.3
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (419 KB)

    This paper proposes a 3-stage ATM switch architecture that uses optical WDM (wavelength division multiplexing) grouped links and dynamic bandwidth sharing. The proposed architecture has two features. The first is the use of WDM technology which makes the number of cables used in the system proportional to system size. The second is the use of dynamic bandwidth sharing among WDM grouped links. This... View full abstract»

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  • Design and implementation of high-speed symmetric crossbar schedulers

    Publication Year: 1999, Page(s):1478 - 1483 vol.3
    Cited by:  Papers (17)  |  Patents (7)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (615 KB)

    Crossbar architectures are widely used to implement high-performance network switches and routers. A crossbar switch can transfer cells between multiple ports simultaneously by closing multiple cross points. This crossbar configuration must be determined by an intelligent centralized scheduler that can ensure fairness and high utilization. In this paper, we describe the design and implementation o... View full abstract»

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  • Hierarchical buffer management for ATM switches

    Publication Year: 1999, Page(s):1484 - 1489 vol.3
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    We present the design of a buffer management scheme for an ATM switch with a shared buffer, when the buffer is logically organized into multiple buffer levels. Conventional schemes statically allocate buffer space in each buffer level through the use of buffer thresholds. Although very simple, these static thresholds are often determined using heuristics and cannot adapt to changing traffic condit... View full abstract»

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  • Implementation of the signaling protocol for the prototype IMT-2000 ATM exchange

    Publication Year: 1999, Page(s):1490 - 1494 vol.3
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    This paper describes the signaling protocol implemented in our prototype ATM-based IMT-2000 exchange (A-IMX). It also presents a demonstration of the mobile service using a simulator, which performs both roles of the mobile station and the base station. After a brief overview of the signaling protocol stack and the basic mobile functions implemented in both the A-IMX and the simulator, the paper o... View full abstract»

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  • A QRD-LSL smoothing algorithm for adaptive equalization

    Publication Year: 1999, Page(s):1495 - 1503 vol.3
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (639 KB)

    This paper introduces order-recursive QRD-based least-squares lattice (QRD-LSL) smoothers for adaptive equalization. The QRD-LSL smoothers use past, present and future received data sequences to estimate the present value of the transmitted data sequence. Except for an overall delay needed for physical realization, QRD-LSL smoothers can substantially outperform conventional QRD-LSL filters in adap... View full abstract»

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  • Equalization and RAKE detection in wideband ISI channels: towards rapproachement

    Publication Year: 1999, Page(s):1504 - 1509 vol.3
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    The maximum-likelihood (ML) detector for direct-sequence spread-spectrum signaling over ISI channels is developed for both symbol-length and long spreading sequences. The approach is based on a delay-domain orthogonal decomposition of a joint specular/diffuse dispersive multipath channel. The detector, which extends the Ungerboeck symbol-spaced structure, demonstrates the path diversity inherent i... View full abstract»

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  • The effect of synchronisation errors on MC-CDMA performance

    Publication Year: 1999, Page(s):1510 - 1514 vol.3
    Cited by:  Papers (21)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (491 KB)

    We investigate the sensitivity of MC-CDMA systems to synchronisation errors. We show that the signal-to-noise ratio (SNR) of the MC-CDMA system at the input of the decision device in the presence of a carrier frequency offset or a clock frequency offset is a rapidly decreasing function of the number of carriers. For a maximal load, carrier phase jitter and timing jitter give rise to a degradation ... View full abstract»

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  • Near optimal PLL design for decision feedback carrier and timing recovery

    Publication Year: 1999, Page(s):1515 - 1520 vol.3
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (571 KB)

    A new design method is presented for the design of PLL loop filters for carrier recovery, bit timing or other synchronization loops given phase noise spectrum and noise level. Unlike the conventional designs, our design incorporates a possible large decision delay and S-curve slope uncertainty. Large decision delays frequently exists in modern receivers due to, for example, a convolutional decoder... View full abstract»

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  • Joint linear timing and carrier phase estimation of DS-CDMA multiuser communications

    Publication Year: 1999, Page(s):1521 - 1525 vol.3
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (542 KB)

    Previous works on multiuser synchronization assumed that either timing recovery or carrier phase recovery scheme is available. Based on the ideas to linearly combine the sufficient statistics of timings and carrier phases, we introduce the generalized joint linear timing and carrier phase estimation scheme which is of commensurate complexity with the generalized linear timing estimator. To avoid t... View full abstract»

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  • Hybrid sequential acquisition schemes for noncoherent chip-asynchronous DS/SS systems

    Publication Year: 1999, Page(s):1526 - 1530 vol.3
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (510 KB)

    This paper investigates the design and performance of hybrid sequential and nonsequential acquisition schemes for direct-sequence spread-spectrum (DS/SS) systems in the presence of multiple-access interference. Carrier phase and chip boundary information are not available at the time of acquisition. Simulation results show that the sequential scheme significantly outperforms the nonsequential sche... View full abstract»

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  • Blind equalization algorithms with automatic constellation phase recovery for dual-mode CAP-QAM reception

    Publication Year: 1999, Page(s):1531 - 1536 vol.3
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (489 KB)

    Some emerging broadband access standards require a receiver that can first blindly start up, then blindly distinguish between carrierless amplitude modulation/phase modulation (CAP) and quadrature amplitude modulation (QAM), and finally decode the signal. The "brute force" solution to this problem would be to implement CAP and QAM receivers in parallel. However, we propose a novel dual-mode receiv... View full abstract»

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  • Direct blind MMSE channel equalization based on second order statistics

    Publication Year: 1999, Page(s):1537 - 1541 vol.3
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (486 KB)

    A family of new MMSE blind channel equalization algorithms based on second order statistics are proposed. Instead of estimating the channel impulse response, we directly estimate the cross-correlation function needed in Wiener-Hopf filters. We develop several different schemes to estimate the cross-correlation vector, with which different Wiener filters are derived according to minimum mean square... View full abstract»

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