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1995 IEEE 45th Vehicular Technology Conference. Countdown to the Wireless Twenty-First Century

25-28 July 1995

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  • 1995 IEEE 45th Vehicular Technology Conference

    Publication Year: 1995
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  • Conference Author Index

    Publication Year: 1995
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  • Multi-rate schemes in DS/CDMA systems

    Publication Year: 1995, Page(s):1006 - 1010 vol.2
    Cited by:  Papers (90)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    Different modulation schemes supporting multiple data rates in a direct sequence code division multiple access (DS/CDMA) system are studied, focusing on how to support personal communication services. Both AWGN and multipath Rayleigh fading channels are considered. It is shown that the multi processing-gain scheme and the multi-channel scheme have almost the same performance. However, the multi-ch... View full abstract»

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  • Performance analysis of an intermediate-hop radio network architecture for MBS

    Publication Year: 1995, Page(s):1001 - 1005 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    A proposal for an intermediate-hop radio network is presented which is a MS-MS-link allowing network based on the Mobile Broadband System (MBS). The MBS operating at 60 GHz (with bit rates up to 155 Mbit/s) has most likely to rely on line of sight (LOS) connections, which results in the problem of shadowing. The proposed network architecture is compared with conventional cellular radio networks by... View full abstract»

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  • New indoor high-speed radio communication system

    Publication Year: 1995, Page(s):996 - 1000 vol.2
    Cited by:  Papers (13)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    We propose a new concept for indoor high-speed radio communication includes a no-wiring relay station (RS) on the ceiling. The concept offers very simple set up procedures, and flexibility in composing and adjusting radio zones. We introduce a prototype of the RS, which operates using the voltage supplied to standard fluorescent sockets. Planar multibeam and pencil-beam array antennas for the RS a... View full abstract»

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  • Wideband coherent DS-CDMA

    Publication Year: 1995, Page(s):779 - 783 vol.2
    Cited by:  Papers (37)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    A coherent CDMA access architecture that supports multimedia services and also flexible system deployment is described. For the flexible use of the limited radio frequency resources, a multiple-band system is suitable. The bandwidth selected depends on the maximum data rate to be supported. This paper focuses on a 10 MHz coherent DS-CDMA system because it provides a generic model for systems using... View full abstract»

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  • Performance evaluation of two channel assignment algorithms in cellular digital packet data networks

    Publication Year: 1995, Page(s):537 - 543 vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    Performance evaluation of two channel assignment algorithms in cellular digital packet data (CDPD) networks is presented. Comparisons are made for three categories, namely, data throughput, average delay, and normalized voice traffic loss. Both simulation and analytical approaches are used to arrive at the results. The effects of varying the burst size, data traffic, and channel characteristics ar... View full abstract»

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  • Performance of PACS-UB for unlicensed operation

    Publication Year: 1995, Page(s):754 - 758 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The FCC has allocated the band between 1920 MHz and 1930 MHz for unlicensed personal communications services (UPCS) using isochronous or circuit operation. The UPCS spectrum is between the licensed PCS spectrum bands of 1850-1910 kHz and 1930-1990 MHz. Terminal interoperability in both the UPCS spectrum on private indoor wireless systems and the licensed spectrum on public PCS systems is desirable... View full abstract»

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  • A model for performance evaluation in M-QAM-OFDM schemes in prescence of nonlinear distortions

    Publication Year: 1995, Page(s):830 - 834 vol.2
    Cited by:  Papers (26)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    The paper presents a model for a semi-analytic performance evaluation in M-QAM-orthogonal frequency division multiplexing (OFDM) digital radio systems in the presence of an additive white gaussian noise (AWGN) transmission channel and nonlinear distortions due to a high power amplifier (HPA). It is shown that, in the case of an OFDM system with a large number of sub-carriers, the distortion on the... View full abstract»

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  • TETRASIM: a simulation software package for analyzing the TETRA receiver performance

    Publication Year: 1995, Page(s):509 - 513 vol.2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    TETRA (Trans-European Trunked RAdio) is a new digital mobile radio standard currently being defined by ETSI (European Telecommunications Standards Institute). It will offer a wide range of services and facilities with a greater spectrum efficiency compared to the present analog PMR (private mobile radio) systems. This paper reports a description of the main features of a software package developed... View full abstract»

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  • Efficient mobility management support for wireless data services

    Publication Year: 1995, Page(s):902 - 906 vol.2
    Cited by:  Papers (13)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    The paper describes a mobile data network architecture with a novel predictive mobility management algorithm to support global mobile data accessing. The concept of a mobile distributed system platform with mobile-floating agents is proposed to support service and resource mobility, that is, to distribute network services and resources closer to mobile users. Furthermore, by combining the predicti... View full abstract»

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  • Spurious emission limits for mobile transmitters: an approach and results

    Publication Year: 1995, Page(s):991 - 995 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    This paper describes a Monte-Carlo method for evaluating discrete spurious emission limits. Building upon extensive data for receiver characteristics from an original CEPT (Conference of European Posts and Telecommunications) report, the technique was developed in order to determine the magnitude of the potential spurious emission problem by calculating the probability of interference. Parameters ... View full abstract»

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  • A dynamic range enhancement technique for fiber optic microcell radio systems

    Publication Year: 1995, Page(s):774 - 778 vol.2
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    A new approach is evaluated which effectively increases the dynamic range of optical fiber links for transporting RF signals. This new approach, called the dynamic range enhancement technique (DRET), is key to connecting remotely located microcell base station antenna sites to a centralized base station via optical fiber while maintaining a good dynamic range. The cause and characteristic of disto... View full abstract»

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  • A new serial search acquisition approach with automatic decision threshold control

    Publication Year: 1995, Page(s):530 - 536 vol.2
    Cited by:  Papers (6)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    A new approach to pseudo noise (PN) code acquisition for a code division multiple access (CDMA) direct sequence spread spectrum system is presented and analyzed. The new approach adaptively estimates the optimal threshold by exploiting the signal and noise statistics, uses the threshold to make a decision to stop or to continue the search process by employing pre-verification logic, and obtains fa... View full abstract»

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  • System performance prediction for personal communication systems

    Publication Year: 1995, Page(s):749 - 753 vol.2
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    A new location reliability formula, based on a path loss model appropriate for microcellular communication, is derived. Also an improved interpolation formula, for the calculation of log-normal shadow fading loss is presented View full abstract»

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  • Minimisation of the peak to mean envelope power ratio of multicarrier transmission schemes by block coding

    Publication Year: 1995, Page(s):825 - 829 vol.2
    Cited by:  Papers (116)  |  Patents (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    A block coding scheme for the reduction of the peak to mean envelope power ratio of multicarrier transmission schemes is described. The principle of the scheme is illustrated with the specific example of a four carrier signal. The potential of the technique is investigated and it is shown that the application of a 1/2 rate code could typically result in a peak to mean envelope power ratio of aroun... View full abstract»

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  • Optimal rate and power allocation in portable communication networks

    Publication Year: 1995, Page(s):579 - 583 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    In this paper optimal transmission-rate and power allocation for multilink portable radio networks is investigated. The rate allocation problem is considered first for a static AWGN channel, which corresponds to the case when the portable unit is fixed in its position. The performance criterion is chosen to be the total bit error rate of the system and it is shown that the optimal link rates are t... View full abstract»

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  • Performance of handover priority and queueing systems under different handover request strategies

    Publication Year: 1995, Page(s):897 - 901 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    In a mobile communication system, handover priority schemes and queueing schemes have been proposed to give preference to handovers over new arrivals, because the drop-out of an existing call has more impact on performance than does blocking a new call. The performance of several handover priority schemes are investigated using simulation modelling of both the transmission and traffic processes. I... View full abstract»

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  • On remedying the traffic nonuniformity effects in LEO satellite communication systems

    Publication Year: 1995, Page(s):986 - 990 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    It has been shown in our previous studies that the geographical traffic nonuniformity considerably affects the performance of the low earth-orbit satellite communications systems. In this paper, a new scheme for improving the throughput characteristics of these systems at nonuniform traffic distribution is proposed. In this method, some parts of the users under the satellite which is flying over t... View full abstract»

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  • Distributed measurement-based dynamic channel assignment for personal communications

    Publication Year: 1995, Page(s):769 - 773 vol.2
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    Conventional centralized and predication-based channel assignment methodology, whether fixed or dynamic, is not suitable for the emerging personal communications environments. The distributed measurement-based channel assignment approach seems to be a practical solution to these environments. We compare the performance of two different distributed measurement-based algorithms and one conventional ... View full abstract»

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  • Antennas design considerations for personal communications user protection

    Publication Year: 1995, Page(s):844 - 847 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    A phased array antenna is shown to be capable of reducing, by about 11 dB, the radio frequency exposure of the head of a personal communications handset user at frequencies near 2 GHz. Overall efficiency and azimuth coverage are simultaneously improved. Chosen regions in the head may be given greater protection by exciting the phased array to produce field cancellation at a point in the antenna's ... View full abstract»

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  • Amplifier linearisation using RF feedback and feedforward techniques

    Publication Year: 1995, Page(s):525 - 529 vol.2
    Cited by:  Papers (1)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    The performance of feedback as a distortion reduction technique is highly dependent on the integrity of the feedback path. Any error or noise generated in this path is directly reflected into the output of the amplifier. Cartesian feedback requires a demodulator in the feedback loop and this is a potential source of linear errors, nonlinear errors, and noise. RF feedback with Cartesian compensatio... View full abstract»

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  • Analysis of CDMA range extension due to soft handoff

    Publication Year: 1995, Page(s):917 - 921 vol.2
    Cited by:  Papers (30)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    We provide an analysis of CDMA range extension due to soft handoff. A simulation of GSM hard handoff and CDMA soft handoff is presented. In these simulations, a collection of 90 second calls are tracked through the system and the margin required to meet a constant call reliability is determined. A comparison of these margins for both GSM and CDMA indicate that, under a variety of conditions, the s... View full abstract»

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  • Performance and characteristics of GSM-based PCS

    Publication Year: 1995, Page(s):743 - 748 vol.2
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    Personal communication services (PCS) based on the GSM system, also called PCS1900, provides an advanced wireless system concept with a high performance air interface. The combination of techniques such as frequency hopping, equalization, channel coding and spatial diversity help in controlling the hostile radio environment. The performance is evaluated mainly in terms of coverage and capacity, an... View full abstract»

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  • Noncoherently detected trellis-coded partial response CPM on mobile radio channels

    Publication Year: 1995, Page(s):669 - 673 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    This paper presents a noncoherent receiver for partial response trellis-coded continuous phase modulation (TC-CPM) on interleaved flat Rician fading channels. By using a multiple-symbol observation interval and a simple metric calculator, the power efficiency is improved as compared to the conventional single-symbol observation interval, without significantly increasing the receiver complexity. Pe... View full abstract»

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