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IEEE 39th Vehicular Technology Conference

1-3 May 1989

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Displaying Results 1 - 25 of 141
  • 39th IEEE Vehicular Technology Conference (IEEE Cat. No.89CH2739-1)

    Publication Year: 1989
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    Freely Available from IEEE
  • The performance of GTFM in a frequency-selective Rayleigh fading channel

    Publication Year: 1989, Page(s):878 - 883 vol.2
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (513 KB)

    Generalized tamed frequency modulation (GTFM) is a bandwidth-efficient digital modulation technique suitable for use in land mobile radio systems. The authors examine the influence of both frequency-flat and frequency-selective Rayleigh fading on GTFM with discriminator detection. In addition, the effects of cochannel and adjacent channel interference are considered in the frequency-flat fading ch... View full abstract»

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  • Performance of a low complexity CELP speech coder under mobile channel fading conditions

    Publication Year: 1989, Page(s):647 - 651 vol.2
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    The authors report on the simulation of a voice codec intended for the terrestrial and satellite radio environments. The coder is based on a complexity reduced version of code-excited linear prediction (CELP). The codebook search complexity has been reduced to only 0.5 MFLOPS (million floating point operations per second) while maintaining excellent speech quality. Novel methods to quantize the re... View full abstract»

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  • Short-block equalization techniques employing channel estimation for fading time-dispersive channels

    Publication Year: 1989, Page(s):142 - 146 vol.1
    Cited by:  Papers (10)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    The objective of the present study is reliable digital communications over fading channels with severe time-dispersion. The authors present three short-block equalization techniques based on linear, nonlinear decision-directed, and maximum-likelihood estimation principles. Short alternating blocks of data and training symbols are used. In contrast to the recursive symbol-by-symbol equalization app... View full abstract»

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  • Application engineering considerations for cellular repeaters

    Publication Year: 1989, Page(s):532 - 534 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    The author presents some real-life examples demonstrating the system engineering used in installing cellular repeaters. The examples given includes stretches of freeway, golf courses, tunnels and convention centers. It is concluded that cellular repeaters can be used to improve coverage on a cost-effective basis in rural areas, downtown in major cities and in all types of environments from desert ... View full abstract»

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  • Rayleigh fading compensation method for 16QAM in digital land mobile radio channels

    Publication Year: 1989, Page(s):640 - 646 vol.2
    Cited by:  Papers (91)  |  Patents (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    The authors propose a novel Rayleigh fading compensation method for 16 quadrature amplitude modulation (16QAM). The optimum parameters for 16QAM with a transmission rate of 16 k symbol/s, the BER (bit error rate) performance, and the interference performance are determined by computer simulation. It is shown that second-order interpolation is suitable for the fading compensation method. In the cas... View full abstract»

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  • Quality antenna site management [land mobile radio]

    Publication Year: 1989, Page(s):195 - 200 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (992 KB)

    The author provides a fairly nontechnical portrayal of his experience in managing an antenna site in Jacksonville. The company's strategy to achieve business success through quality is outlined. The following elements of the strategy are described in detail: (1) premium site, (2) master antenna system, (3) quality installation, (4) resident site manager, and (5) control of interference View full abstract»

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  • Multisite throughput of a mobile data radio link. II. The downlink

    Publication Year: 1989, Page(s):270 - 278 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    For pt.I see IEEE 38th Vehicular Technology Conference, p.408-13 (June 1988). The author presents some methods for multisite throughput calculations for a mobile data radio downlink. The downlink channel throughput (from the site to the mobile units) for a single-site system equals 1 because the transmissions are scheduled and no conflict occurs. The service area and system throughput are limited ... View full abstract»

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  • Performance evaluation of a fading estimation/cancellation receiver for trellis coded CPM signals

    Publication Year: 1989, Page(s):101 - 105 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The authors study the application of a fading estimation/cancellation method to trellis-coded continuous phase modulation (TC-CPM) schemes. Based on the maximum likelihood ratio test (MLRT), they derive two algorithms that cancel the effects of nonselective, multiplicative fading from MSK-type (minimum-shift-keying) signals. The first one is an extension of an algorithm presented previously by the... View full abstract»

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  • System design for portable telephones: methods to enable initiating and receiving calls from a vehicle

    Publication Year: 1989, Page(s):136 - 141 vol.1
    Cited by:  Papers (3)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The author proposes the application of the small zone format which adapts the microcell for plural position-registration as one step in realizing a portable telephone set method for communicating at any time, at any place, and to anywhere by using cordless telephones with small (10 mW) output power. Another proposal is to install cordless-telephone key service units on poles along the streets in s... View full abstract»

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  • On frequency radio (OFR) repeater as fade filler

    Publication Year: 1989, Page(s):528 - 531 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The on-frequency radio repeater is proposed as a solution to the problem of filling in coverage holes in mobile (particularly portable) communications. The basic conceptual design of the OFR repeater is described; its limitations are discussed; and some of its typical applications (building coverage and outside fade filler) are noted View full abstract»

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  • Modelling and simulation of the propagation characteristics of the 900 MHz narrowband-TDMA CEPT/GSM mobile radio

    Publication Year: 1989, Page(s):631 - 639 vol.2
    Cited by:  Papers (5)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    The authors examine the problem of modelling and simulating the propagation characteristics for the pan-European digital mobile radio system, as specified by CEPT/GSM (Conference Europe des Postes et des Telecommunications/Group Special Mobiles). The modelling problem is solved by means of the time- and frequency-dependent linear filter (TFLF) identified by its transfer functions and representativ... View full abstract»

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  • Inductive loop system equivalent circuit model

    Publication Year: 1989, Page(s):689 - 700 vol.2
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    The author describes the development and application of an equivalent circuit model and computer program to calculate the apparent self-inductance and quality factor vs. frequency of square, rectangular, quadrupole, and circular loops of round wire buried in a roadway. The computer program calculates the loop apparent inductance and quality factor versus operating frequency (20-60 kHz) for a selec... View full abstract»

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  • Driver guidance-an enhancement or a requirement in automatic vehicle location (AVL) systems

    Publication Year: 1989, Page(s):192 - 194 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    Arguments are presented to show why driver guidance (DG) should be a requirement for AVL systems. The navigator functions and cost-effectiveness of DG are described. It is concluded that AVL with driver guidance provides direct benefits to the driver, thus making the AVL system perceivable as a tool to make the job easier, not as a management method of `spying' and that driver guidance saves time,... View full abstract»

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  • Diversity antennas for portable telephones

    Publication Year: 1989, Page(s):50 - 56 vol.1
    Cited by:  Papers (20)  |  Patents (58)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    The design of high-performance built-in diversity antennas are described for two types of portable telephones: over-the-shoulder and handheld type telephones. First, the fundamental characteristics of a planar inverted-F antenna (PIFA) are presented. This type of antenna was chosen as the diversity antenna element for its compactness. The diversity antennas for the over-the-shoulder telephone are ... View full abstract»

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  • Adaptive ML neural network based receiver for Q2PSK modulated data-transmission systems

    Publication Year: 1989, Page(s):263 - 269 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The maximum-likelihood (ML) receiver structure is derived for the detection of digital data symbols transmitted using a four-dimensional signalling scheme in the presence of intersymbol interference and additive white Gaussian noise. The transmitter employs quadrature-quadrature phase-shift keying (Q2PSK) which is a relatively new spectrally efficient modulation scheme and can be consid... View full abstract»

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  • Microprocessors in the car and on the desk, have they been tested for FR interception or radio frequency susceptibility?

    Publication Year: 1989, Page(s):212 - 214 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    The author argues that microprocessors in cars and homes are vulnerable to radio-frequency interception (RFI) or radio-frequency susceptibility (RFS). He points out that the RFI/RFS problem may be brought about by dealers, and owners/operators of microprocessors/computers in service at locations in proximity to RF sources. Recommendations on alleviating this problem are presented View full abstract»

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  • Speech enhancement in the communication between vehicles

    Publication Year: 1989, Page(s):897 - 901 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The spectral-subtraction technique is applied to enhance some Arabic sounds embedded in helicopter noise as well as other types of environmental noise. The results show that this method is more efficient for speech enhancement than the other methods such as comb and adaptive filtering. The decrease in the value of the threshold factor from 0.02 to 0.001 has served to improve the intelligibility of... View full abstract»

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  • Trellis coded noncoherent QAM: a new bandwidth and power efficient scheme

    Publication Year: 1989, Page(s):95 - 100 vol.1
    Cited by:  Papers (16)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The authors introduce the concept of noncoherently detected, multilevel/phase trellis coded schemes. They derive the optimal noncoherent decoding algorithm for trellis coded QAM (quadrative-amplitude-modulated) signals. Further, two reduced complexity decoder structures are proposed and analyzed. The first is based on a reduced state algorithm, whereas the second one uses a novel algorithm that co... View full abstract»

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  • Cellular models and hand-off criteria

    Publication Year: 1989, Page(s):128 - 135 vol.1
    Cited by:  Papers (10)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    The authors consider methods of improving the hand-off process in current cellular systems, particularly in large cities where the cell size is smaller, in order to increase the capacity and service high subscriber traffic density. In this case, the mobiles will cross all boundaries more often, leading to a high number of hand-offs; a hand-off based only on the strongest received signal is not nec... View full abstract»

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  • DECT-digital European cordless telecommunications

    Publication Year: 1989, Page(s):718 - 721 vol.2
    Cited by:  Papers (62)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The author presents advanced applications for cordless telecommunications, clarifies the differences between cordless telecommunications and mobile radio, and outlines the steps towards European standardization which have been made so far, Professional applications such as business cordless telecommunications using the microcellular concept are discussed. It is shown that cordless telecommunicatio... View full abstract»

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  • Propagation considerations of low power cellular boosters and case histories

    Publication Year: 1989, Page(s):523 - 527 vol.2
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    Booster site selection often has tighter constraints placed upon it than cell site selection. Low-power 800-MHz cellular boosters usually provide a 250 mW ERP (effective radiated power) and are located several miles from the donor cell site. Two propagation problems must be analyzed, the donor-to-booster path loss and the booster coverage contour. In either case, the typical propagation model (e.g... View full abstract»

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  • A statistical model for line-of-sight (LOS) factory radio channels

    Publication Year: 1989, Page(s):496 - 503 vol.2
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    A statistical model, based on experimental data, is presented to characterize the multipath propagation medium in typical manufacturing environments. This model includes the statistics of multipath propagation characteristics for cases of light and heavy clutter in a factory where there is a direct path from transmitter to receiver. The dynamic behavior of the medium is described by a time-varying... View full abstract»

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  • Antenna selection diversity for framed digital signal transmission in mobile radio channel

    Publication Year: 1989, Page(s):470 - 473 vol.2
    Cited by:  Papers (8)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    An antenna selection diversity method is proposed in which received signal levels from the antennas are measured in a time-division manner and a switching operation is performed in the preamble or postamble portion of a framed digital signal. Hence the switching noise problem is avoided. Deterioration in diversity performance, compared with the case of a post-detection diversity, can be kept withi... View full abstract»

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  • Evaluation of overall outage probability in cellular systems

    Publication Year: 1989, Page(s):625 - 630 vol.2
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    A novel method for the evaluation of the overall outage probability in cellular mobile radio is proposed. This method involves both links, i.e., M→B (mobile-to-base) and B→M (base-to-mobile), taking into account the joint effects of co-channel and adjacent channel interferences, the net filter discrimination, the radiation patterns of the base station antennas, the power control characte... View full abstract»

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