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1998 International Zurich Seminar on Broadband Communications. Accessing, Transmission, Networking. Proceedings (Cat. No.98TH8277)

17-19 Feb. 1998

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  • 1998 International Zurich Seminar on Broadband Communications. Accessing, Transmission, Networking. Proceedings (Cat. No.98TH8277)

    Publication Year: 1998
    Request permission for commercial reuse | PDF file iconPDF (227 KB)
    Freely Available from IEEE
  • Author index

    Publication Year: 1998, Page(s): 307
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    Freely Available from IEEE
  • Resource management techniques applied to satellite communications networks

    Publication Year: 1998, Page(s):1 - 8
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (748 KB)

    Efficient resource management is mandatory to achieve maximum system capacity for the next generation communications systems. Resource management deals with the available spectral band, time, power, and space for a transmission signal. It includes (i) the frequency planning and (ii) the assignment of transmission resources to users. The paper presents a generalized notation as well as graph algori... View full abstract»

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  • A CORBA based architecture for QoS-sensitive networking

    Publication Year: 1998, Page(s):201 - 208
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    We describe an architecture, based on the common object request broker architecture (CORBA), for the communication support of quality of service (QoS) sensitive networked multimedia applications. Shared by both control and management entities, this architecture smoothly integrates real-time QoS oriented communication services, such as those offered now or planned for the future in the public netwo... View full abstract»

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  • Scattering function in delay and Doppler induced by motion in a dense multipath environment

    Publication Year: 1998, Page(s):165 - 169
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    The delay spread profile for a dense multipath environment, modeled as a wide sense stationary uncorrelated scatterers (WSSUS) channel, has recently been derived for stationary transmitter-receiver pairs. The result shows the dependence of the profile on transmitter-receiver distance. In this paper we extend the analysis to the case that this distance is changing at constant velocity, inducing dif... View full abstract»

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  • TDMA-based broadband fixed radio access: performance and implementation issues of adaptive equalizers

    Publication Year: 1998, Page(s):193 - 200
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The performance of adaptive equalization strategies for future broadband fixed ATM radio access systems is investigated. The LMS and zero forcing algorithms are suitable for the downlink, whereas for the uplink, a fast converging RLS algorithm has to be employed. Furthermore, a hybrid F/TDMA has to be implemented to transmit the assumed 156 Mbit/s in the uplink. A complexity analysis comparing dif... View full abstract»

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  • Influence of polarization on 30 GHz broadband radio channels

    Publication Year: 1998, Page(s):159 - 164
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    “Radio in the Local Loop” for ATM transmission is expected to become economically important if transmission channels prove to be sufficiently well behaved. Using a PRBS channel sounder we have measured channel impulse responses at 29.940 GHz with a 5 ns temporal resolution for distances up to 3.8 km. We have further investigated the influence of polarization on fading and delay spread.... View full abstract»

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  • Efficient equalization of discrete wavelet multi-tone over twisted pair

    Publication Year: 1998, Page(s):185 - 191
    Cited by:  Papers (5)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    In this paper, we examine the efficacy of different equalization schemes for discrete wavelet multi-tone (DWMT) with relatively high average bandwidth efficiency (6 bps/Hz). Using simulated bit error rate (BER) performance results, we demonstrate that the sensitivity of DWMT to small amounts of distortion in the end-to-end channel makes it infeasible to use only FIR filtering at the DWMT receiver ... View full abstract»

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  • Optical millimeter-wave systems for broadband mobile communications, devices and techniques

    Publication Year: 1998, Page(s):51 - 58
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (812 KB)

    Future mobile communication systems have to meet the demands of broadband services. The 60 GHz-range is proposed for the radio link frequency in these cellular systems. The combination of optical techniques and millimeter-wave techniques at these frequencies is a promising approach for cost-effective network implementation. Besides the low-loss fiber-based data transmission, this combination allow... View full abstract»

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  • A presentation of the ACTS Project AC215 CRABS: cellular radio access for broadband services

    Publication Year: 1998, Page(s):155 - 158
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    The paper gives a presentation of the ACTS Project AC215 CRABS which focuses on the development and demonstration of a broadband radio system for interactive services operated at 40 GHz. The project covers service and user aspects, architecture and systems studies including extensive simulations, studies of propagation issues to determine propagation type quality of service (QoS) criteria and cove... View full abstract»

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  • On the ability of CDMA to combat log-normal fading

    Publication Year: 1998, Page(s):17 - 22
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    In contrast to the common opinion, that CDMA offers only advantages to overcome frequency-selective fading, it is shown that CDMA can combat log-normal fading (long-term fading), too. This statement holds under the following two conditions. First, equal transmission rates for all users are presupposed. Second, interference cancellation is applied to combat multiple access interference. Including c... View full abstract»

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  • A new flow control scheme for integrated ATM services

    Publication Year: 1998, Page(s):219 - 224
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A new synchronous flow control scheme for integrated ATM services using explicit rate indications (SER) is proposed in this paper. The presented scheme allocates bandwidth fairly, efficiently and rapidly. The rate of an available bit rate (ABR) source in the SER scheme goes up monotonously with time. By introducing virtual nodes, the transient durations experienced by ABR connections can further b... View full abstract»

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  • Linear and decision-feedback MIMO equalization for transmultiplexer-based high bit rate transmission over copper wires

    Publication Year: 1998, Page(s):177 - 184
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    In this paper, we investigate detectors for transmultiplexer-based high bit rate transmission over dispersive channels like telephone wires. The transmitter is based on a synthesis stage. At the receiver we design, for an MMSE criterion, fractionally spaced multiple-input/multiple-output (MIMO) linear detectors applied after an analysis stage. The receiver may be upgraded with a MIMO decision-feed... View full abstract»

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  • Physical and network aspects concerning the number of wavelengths in WDM systems

    Publication Year: 1998, Page(s):63 - 68
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    Wavelength division multiplexing (WDM) is an attractive method to exploit the enormous bandwidth of optical fibers. A key issue in amplified WDM systems is the appropriate choice of the number of wavelengths. This number is upper bounded by the available optical bandwidth and the required wavelength separation due to filter crosstalk as well as nonlinear fiber effects. By means of simulations this... View full abstract»

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  • Algorithms and VLSI architectures for RLS-based time reference beamforming in mobile communications

    Publication Year: 1998, Page(s):29 - 36
    Cited by:  Papers (1)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (948 KB)

    We propose the use of RLS-based techniques for adaptive antenna signal processing in mobile communications, where systems are required to operate reliably in the presence of strong interference and under time-varying propagation conditions. We present several practical schemes for implementing digital beamformers employing training sequences for initial weight adaptation and either periodically in... View full abstract»

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  • Protocols for a wireless-ATM multihop network

    Publication Year: 1998, Page(s):75 - 82
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (812 KB)

    A medium access control protocol for a wireless multihop network is described and evaluated. The network is able to guarantee the bandwidth contracted to a connection in a hidden station environment and to most efficiently use the spectrum capacity by providing a mechanism for dynamic channel allocation to services. Both channel and packet switched services are supported, based on real channel con... View full abstract»

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  • A wireless multimedia DS-CDMA network based on adaptive transmission rate/power control

    Publication Year: 1998, Page(s):45 - 50
    Cited by:  Papers (3)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    This paper proposes a method of synchronously controlling transmission rate and power for wireless multimedia code division multiple access (CDMA) systems. In the wireless multimedia system, quality of service (QoS) such as bit error rate (BER), signal-to-noise ratio (SNR) and delay time should be taken into account. The wireless CDMA system can achieve a flexible balance if transmission rate and ... View full abstract»

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  • OFDM and related methods for broadband mobile radio channels

    Publication Year: 1998, Page(s):91 - 98
    Cited by:  Papers (4)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    A comparison is made of multicarrier and single carrier modulation schemes for radio communication systems. In both schemes, the fast Fourier transform (FFT) and its inverse are utilized. For OFDM (orthogonal frequency division multiplexing), the inverse FFT transforms the complex amplitudes of the individual subcarriers at the transmitter into the time domain. At the receiver, the inverse operati... View full abstract»

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  • The CABSINET project: a flexible cellular broadband architecture

    Publication Year: 1998, Page(s):149 - 154
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    The CABSINET (Cellular Access to Broadband Services and Interactive Television) project is part of the EC Advanced Communications Technologies and Services (ACTS) Programme. It is co-ordinated by CRL, with FUB as the Technical Manager. The project focuses on “last mile” cellular wireless access enabling delivery and use of interactive TV and broadband services. It aims to enhance the f... View full abstract»

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  • Implementation of HyperFM data broadcasting system

    Publication Year: 1998, Page(s):259 - 266
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (804 KB)

    In this paper, a HyperFM data broadcasting system is proposed, in which hypertext data are transmitted toward personal computers via an FM (frequency modulation) radio channel. This system is based on using the vacant frequency space in the FM radio band to broadcast multimedia data at a low cost. The HyperFM data are multiplexed with FM voice signals and transmitted at a rate of 16 kbps. The data... View full abstract»

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  • Blind identification of channels for discrete multitone (DMT) applications

    Publication Year: 1998, Page(s):113 - 118
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    This paper presents an alternate channel identification approach for discrete multitone (DMT) systems. This method uses a blind algorithm-instead of data-driven algorithms-to identify the channel from the received symbols and knowledge of the statistics of the transmitted symbols. The structure of an ideal DMT system is outlined, and the channel identification algorithm is developed as an extensio... View full abstract»

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  • Call control in the mobile terminal of a wireless ATM network

    Publication Year: 1998, Page(s):135 - 141
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    In the frame of the Research and Development Programme ACTS (advanced communications technologies and services) of the European Union, a high-speed indoor Wireless ATM (asynchronous transfer mode) access network is being investigated in the project “Wireless ATM Network Demonstrator (WAND)”. The main objective of the project WAND is to support integrated multimedia services with QoS (q... View full abstract»

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  • Hard and soft decision decoding of phase rotation invariant block codes

    Publication Year: 1998, Page(s):249 - 251
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    We consider a binary discrete channel with phase inversion and with random errors. Such a channel is a cascade of two channels. We also consider a continuous channel with phase inversion. For both channels, we wish to correct a phase inversion error when it occurs as well as random errors. For this purpose, we introduce a special metric to describe combinations of these errors. We call this metric... View full abstract»

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  • QoS provisioning in handoff algorithms for wireless LAN

    Publication Year: 1998, Page(s):9 - 16
    Cited by:  Papers (3)  |  Patents (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    The performance of the handoff algorithm is the primary concern for supporting mobile devices with roaming capability in wireless communications. The IEEE 802.11 standard for wireless local area networks (LANs) recommends carrier sense multiple access with collision avoidance (CSMA/CA) as the medium access control (MAC) protocol. The contention-based CSMA/CA access mechanism is sensitive to the tr... View full abstract»

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  • Dimensioning of play-out buffers for real time services in a B-ISDN

    Publication Year: 1998, Page(s):209 - 218
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (996 KB)

    A large fraction of traffic that the future B-ISDN will probably transport is made up of real-time services with stringent delay and delay jitter requirements. Since ATM networks do not provide time transparent links, a delay equalisation has to be provided in the adaptation layer or in user equipment. In this paper we first propose an analytical model that allows the evaluation of the end-to-end ... View full abstract»

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