IEEE Second Symposium on Communications and Vehicular Technology in the Benelux

2-3 Nov. 1994

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  • Proceedings. IEEE Second Symposium on Communications and Vehicular Technology in the Benelux

    Publication Year: 1994
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    Freely Available from IEEE
  • Author index

    Publication Year: 1994, Page(s): 0_9
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    Freely Available from IEEE
  • Comparison of two phase models in indoor radio propagation channels

    Publication Year: 1994, Page(s):38 - 43
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    In this paper two phase models of indoor radio propagation channels (i.e. deterministic and random phase increments) are compared. In the deterministic phase model (model I), phase is updated deterministically using several independent random scatterers for each multipath component. In the random phase model (model II), phase of each multipath updates with independent random increments. Statistica... View full abstract»

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  • Channel adapted RAKE receiver (CARAKE) for coherent uplink demodulation

    Publication Year: 1994, Page(s):155 - 158
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    The paper presents a comparison of the performance between coherent RAKE and differential RAKE receivers with perfect channel estimation. The perfect channel estimation assumption can be realised in the forward link where there is a pilot channel. In the reverse link however, where there is no pilot channel, errors in channel estimation lead to deviations from the theoretical performance. A channe... View full abstract»

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  • DS-CDMA techniques for mobile and personal satellite communications: An overview

    Publication Year: 1994, Page(s):113 - 127
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1224 KB)

    The recent application of code division multiple access (CDMA) to commercial terrestrial radio networks suggested the possibility of extending the same access technique to high-efficiency low-cost satellite systems. A great research and development effort has therefore started, and is still in progress, to fulfill the requirements of modern commercial satellite networks, namely: low-cost user equi... View full abstract»

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  • Comparison of M2-QAM and M-PAM VSB single-carrier systems for digital TV transmission via CATV

    Publication Year: 1994, Page(s):15 - 19
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    The transmission of digital TV pictures has become important topic. For terrestrial broadcasting, a multi-carrier system consisting of a large number of orthogonal carriers (orthogonal frequency division multiplexing (OFDM)) has been proposed. In geographical areas where the cable TV (CATV) distribution system is already widely spread, the CATV distribution network is the main candidate for broadc... View full abstract»

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  • Automated verification of LAN protocols: a case study

    Publication Year: 1994, Page(s):133 - 140
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    The COSPAN development method is a state machine based development method that enables stepwise development of protocols. Both specifications and properties are formalised in the same framework. Automated verification is provided for checking properties against specifications as well as for checking consistency of development. The application of COSPAN in the development of a carrier sense multipl... View full abstract»

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  • Propagation of broadcast signals into buildings at 762 MHz

    Publication Year: 1994, Page(s):28 - 37
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    The paper describes measurements of indoor reception of a 7 MHz OFDM signal transmitted at a center frequency of 762 MHz. The channel impulse response and the selectivity characteristics in the frequency domain and the spatial domain are measured. Furthermore, an indication is given of the effect of building attenuation. Building penetration loss is due to attenuation or shielding of the radio sig... View full abstract»

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  • Space diversity for GSM channels: comparison of performance

    Publication Year: 1994, Page(s):149 - 154
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Examines and compares different diversity approaches combined with linear equalization in order to cope with the unavoidable multi-path propagation effects existing in mobile radio channels. The goal is the definition of the best strategy to combat both fading and frequency selectivity affecting such channels. Complexity is analysed and the performance is compared on a common channel simulation ba... View full abstract»

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  • Investigation of mobile antenna diagrams on cochannel interference

    Publication Year: 1994, Page(s):199 - 202
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    One of the most decisive factors for the quality of service in cellular mobile radio systems is the co-channel interference ratio (C/I), the required carrier signal power divided by the interference power from cochannels. Known methods of improving the C/I include an appropriate choice of the cluster size, directional antennas at the base station and/or steerable directional antennas at the (semi)... View full abstract»

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  • Multiple carrier transmission with time-frequency well-localized impulses

    Publication Year: 1994, Page(s):187 - 193
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Multiple carrier transmission represents a way to cope with the time and frequency selectivity of mobile radio channels. The signals are pulse shaped and transmitted on multiple carriers to reduce the multipath effects. The usually used rectangular or Nyquist root impulses permit a transmission with nearly optimal spectral efficiency, but they are not well localized either in time or in frequency ... View full abstract»

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  • HEMT MMIC-circuits for millimetre-wave telecommunications systems

    Publication Year: 1994, Page(s):107 - 112
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    Future telecommunications systems (e.g. PCS) will use GaAs- and InP-based integrated circuits operating at mm-wave frequencies. The most important figures of merit as cut-off frequency and maximum oscillation frequency of the 3 GaAs and InP-based HEMT MMIC-technologies developed at IMEC, are discussed and compared in this paper. Different design examples of high-frequency integrated circuits are p... View full abstract»

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  • TCM and diversity in a Rayleigh fading channel

    Publication Year: 1994, Page(s):8 - 14
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    The performance of trellis coded 8-PSK with diversity is examined in the paper. The “pragmatic” approach to TCM is assumed, where the code is constructed using a common a rate 1/2 constraint length 7 codec. Using diversity in the form of soft symbol combining in a concatenated TCM/diversity modulation, a performance improvement of about 2 to 3 dB was obtained View full abstract»

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  • Carrier phase jitter sensitivity for single-carrier and multi-carrier QAM systems

    Publication Year: 1994, Page(s):174 - 181
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    Investigates how the carrier phase jitter of a phase-locked oscillator for IF-to-baseband conversion affects the performance of single-carrier QAM (SC-QAM) and multi-carrier QAM (MC-QAM). This phase jitter reduces the signal-to-noise ratio (SNR) at the input of the decision device, and therefore gives rise to an increase of the bit error rate. The authors show that, for a given jitter variance, SC... View full abstract»

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  • Performance evaluation of MM-wave digital radio transmission

    Publication Year: 1994, Page(s):95 - 100
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The transmission performance of wide-band digital radio systems, using the 60 GHz band, is evaluated for different antenna configurations in a room. As there are no models able to express the impact of a selected antenna set-up on the resulting propagation channel model, the complex impulse response (CIR) of the multipath radio channel was calculated using an appropriate ray tracing tool. Service ... View full abstract»

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  • Optical links for installation of a GSM base transceiver station

    Publication Year: 1994, Page(s):222 - 228
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    The coaxial cables that are used in the GSM system for mobile communication to transport the RF signals to and from the antenna in the base transceiver station, are very bulky and heavy. When installing new base stations in existing buildings, these cables cause several problems. The authors therefore propose to use optical transmission links for these signals. An optical fibre is small, very ligh... View full abstract»

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  • Performance of optimum and suboptimum multiuser detection in DS-CDMA mobile radio systems in multipath channels

    Publication Year: 1994, Page(s):74 - 81
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    We consider K-user transmission over multipath channels in the synchronous downlink and the asynchronous uplink of a DS-CDMA system. We investigate the multiuser maximum likelihood sequence detector and different types of linear and nonlinear suboptimum multiuser detectors. Complexity considerations are made and simulation results demonstrate the performance of all detectors investigated. Our resu... View full abstract»

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  • Generation of an altimetrical data base using a geographic information system [mobile radio planning]

    Publication Year: 1994, Page(s):44 - 51
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    This paper aims at illustrating a methodology of generation of an altimetrical data base for mobile radio applications and a procedure developed to manage it, using a GIS (Geographic Information System). The system uses as input a set of digitized maps in the form of contour lines and elevation points obtained from cartographic maps at different scales (1:250,000, 1:50,000 and 1:10,000), and gener... View full abstract»

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  • Multi-h CPM with post-detection diversity for satellite mobile communication systems

    Publication Year: 1994, Page(s):159 - 165
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    The increasing number of users of mobile communication systems and the corresponding need for increased capacity show the importance of using a modulation scheme which is both power and spectrally efficient. In the paper, the comparison between two different multi-h CPM schemes is made for the land mobile satellite communication channel. The study is complemented with the use of post-detection div... View full abstract»

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  • Slot allocation schemes for voice and data services in a radio-mobile packet access system

    Publication Year: 1994, Page(s):128 - 132
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    For third generation cellular communication systems, packet reservation multiple access (PRMA) attracts considerable attention. In recent studies, derivatives of this protocol type have been proposed and evaluated. In these protocols, the slots are allocated centrally by the base station. This work concentrates on the multiplexing of voice and data for such centralised allocation schemes. We propo... View full abstract»

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  • QMSK modulation technique in mobile radio channel environment

    Publication Year: 1994, Page(s):20 - 27
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The quadrature minimum shift keying (QMSK) modulation technique is analysed in mobile radio channel. the BER, obtained by computer simulation, is plotted for various distortions caused by mobile radio channel such as: Rayleigh fading, Gaussian noise, cochannel interference and Doppler frequency. It is found out that the coherently detected QMSK signal has similar performance to GMSK and π/4 QPS... View full abstract»

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  • Switched antenna diversity within a DECT system

    Publication Year: 1994, Page(s):141 - 148
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    To combat the signal-degrading effects of multipath propagation in a DECT system, diversity techniques can be employed. The performance of a switched antenna diversity scheme based on received power is analyzed and compared with the performance of selection diversity for a frequency non-selective radio channel with either Rayleigh or Rician fading characteristics. Received output power statistics ... View full abstract»

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  • Stochastical modeling of signal-to-interference ratio in cellular mobile communication networks

    Publication Year: 1994, Page(s):203 - 207
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The carrier-to-interference ratio is studied as a stochastical variable, whose randomness results from the disturbance of the wave propagation and the fluctuation of the traffic. The mean value and variance for this random quantity are derived, and, as an example, distribution functions are calculated for a TDMA system. The result yields means to determine the capacity hidden in the system dynamic... View full abstract»

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  • Co-channel interference measurement for TDMA radio mobile communication systems

    Publication Year: 1994, Page(s):194 - 198
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    In cellular radio systems, the signal is affected by co-channel interference due to frequency reuse. Power control is a technique for minimizing this co-channel interference. Recent algorithms, based on a minimum signal-to-interference ratio (SIR) requirement, need an accurate SIR measurement. A method of measuring co-channel interference for analogue mobile communication systems has previously be... View full abstract»

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  • OFDM encoding with reduced crestfactor

    Publication Year: 1994, Page(s):182 - 186
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Orthogonal Frequency Division Multiplexing (OFDM) has been proposed for future high speed wireless LANs and digital (television and audio) broadcasting as a promising multicarrier modulation technique. OFDM offers robustness against significant channel degradation by dispersion. For wireless LANs, the design of the transmitter power amplifier and the characteristics of the modulated signal are key... View full abstract»

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