IEEE 39th Vehicular Technology Conference

1-3 May 1989

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  • 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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  • Differential detection of partial response continuous phase modulation with index 0.5

    Publication Year: 1989, Page(s):115 - 121 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (412 KB)

    The author presents a method for the design of an MMSE (minimum mean-squared error) optimum receiver filter for the differentially coherent detection of CPM (continuous phase modulation) with modulation index 0.5. The receiver filter is equivalent to the cascade of a matched filter and an equalizer, to reduce inherent intersymbol interference (ISI). The performance can be improved when the delay b... View full abstract»

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  • FMP: a new digital FM scheme with optimized noncoherent detectability and inherent insensitivity to fadings

    Publication Year: 1989, Page(s):256 - 262 vol.1
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (496 KB)

    The author describes frequency modulation with pulse spreading (FMP) by a chirp filter, a method that optimizes the free Euclidian distance and noncoherent detectability of conventional digital FM schemes. In contrast to conventional schemes, a limiter discriminator receiver with dechirp filter and MLSE (maximum-likelihood sequence estimation) asymptotically approaches the performance of the coher... View full abstract»

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  • Hybrid trellis-coded 8/4-PSK systems

    Publication Year: 1989, Page(s):106 - 114 vol.1
    Cited by:  Papers (2)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (664 KB)

    It is shown how trellis-coded 8-PSK (phase-shift-keying) signals can be modified to become more robust against carrier phase variations, thus allowing more stable carrier recovery. A more robust performance can be achieved by using rate 2/3 trellis-coded 8-PSK and 4-PSK signals in a time-varying manner. In its simplest form, trellis-coded 8-PSK and 4-PSK signals alternate in time. The distance spe... View full abstract»

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  • An efficient ARQ system for mobile communications

    Publication Year: 1989, Page(s):677 - 681 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (312 KB)

    Two modifications of an ARQ (automatic repeat request) scheme proposed by E.J. Weldon (IEEE Trans. on Comm., vol.COM-30, p.480-486, March 1982) for use in systems with limited receiver buffer is studied. Unlike Weldon's scheme in which all erroneous data packets are discarded, the present schemes make use of copies of the data packet which may contain errors. A number of channel models are conside... View full abstract»

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  • Direct sequence spread spectrum parallel acquisition in a fading mobile channel

    Publication Year: 1989, Page(s):774 - 779 vol.2
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (456 KB)

    The acquisition performance of a direct-sequence spread-spectrum system is investigated in a fading mobile environment. A parallel acquisition scheme is applied to make up for the effect of the fading environment on key parameters such as the probability of detection, the probability of false alarm, and the mean acquisition time. An expression for the mean acquisition time is derived in terms of d... View full abstract»

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  • Trends of digital signal processing in automotive

    Publication Year: 1989, Page(s):613 - 624 vol.2
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (644 KB)

    The author first discusses digital signal processing (DSP) characteristics. After reviewing historical digital signal processing solutions, he focuses on single-chip programmable digital signal processors and compares their architectural designs to those of general-purpose microprocessors and microcontrollers. Deficiencies of early digital signal processors are discussed and trends of DSP are expl... View full abstract»

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  • Transparent tone-in-band (TTIB) aided GMSK/MSK modem systems

    Publication Year: 1989, Page(s):249 - 255 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (396 KB)

    The authors propose a scheme which employs BBC (binary block code) coding to allow carrier pilot insertion in GMSK/MSK (Gaussian minimum-shift keying/minimum-shift keying) modems for tone calibration and coherent detection. They analyze the performance of the BBC-coded GMSK/MSK modem and derive a closed-form expression for its performance under Rayleigh fading. The effect of carrier phase noise on... 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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  • Advanced train control systems-a project management perspective

    Publication Year: 1989, Page(s):508 - 516 vol.2
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (696 KB)

    A project management perspective of advanced computer systems is considered. The author covers the technological aspects of management applicable to advanced train-control project engineering processes, i.e., the knowledge and skills required by railroads to organize, plan, and manage advanced train-control-system projects. A practical approach and procedures that work within the existing organiza... View full abstract»

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  • Performance analysis of non-orthogonal MT-FSK systems with degraded branch statistics

    Publication Year: 1989, Page(s):671 - 676 vol.2
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (364 KB)

    The authors analyze the performance degradation of a MT-FSK (multiple-tone frequency-shift keying) scheme based on Steiner designs on a Rayleigh fading channel with degraded branches. Two cases are shown, a fading channel with correlated branches and a fading channel with unequal average signal-to-noise ratio per branch. These two impairments are shown to decrease the effective diversity; however,... 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 (62)
    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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  • Factors affecting the bandwidth efficiency of packet reservation multiple access

    Publication Year: 1989, Page(s):292 - 299 vol.1
    Cited by:  Papers (29)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (540 KB)

    The authors have extended a preliminary study of packet reservation multiple access (PRMA) by examining the influence of a large number of system variables on PRMA performance. The measure of efficiency is η, the maximum number of conversations per channel that PRMA can support within a given packet-dropping probability constraint of Pdrop⩽0.01. The number of channels is defined... View full abstract»

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  • A comparison of CDMA and NPCSMA for an indoor data network

    Publication Year: 1989, Page(s):767 - 773 vol.2
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (420 KB)

    An indoor communication system using direct-sequence spread-spectrum signaling is considered. CDMA (code-division multiple-access) and NPCSMA (nonpersistent carrier-sense multiple-access) are considered as multiple-access alternatives and are compared based on their throughput and delay characteristics. The advantage of multipath diversity is illustrated. For NPCSMA and CDMA, delay and code length... View full abstract»

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  • Cummins electronic controls for heavy duty diesel engines

    Publication Year: 1989, Page(s):595 - 612 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1304 KB)

    Heavy-duty diesel engines with the PACE limited-authority electronic control are on the road in some quantity, while Cummins is also introducing the Electronically Controlled Injection full-authority system on its engines. The authors describe these engine controls and show how a family of products concept is resulting in a smooth introduction of this technology into the heavy-duty diesel-powered ... View full abstract»

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  • Effect of correlation on a mobile radio maximal ratio diversity combiner for CPM with multiple interfering signals

    Publication Year: 1989, Page(s):452 - 457 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (312 KB)

    The authors introduce an algorithm to evaluate the error probability over Gaussian and Rayleigh fading channels for continuous phase modulation (CPM) with multiple interfering signals using MSK (minimum-shift keying)-type receivers. The error performance associated with space diversity for the ideal MRC (maximal ratio combining) technique is examined. The diversity combining technique, even with o... View full abstract»

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  • Data detection and timing recovery for a noncoherent discriminator-based GMSK receiver

    Publication Year: 1989, Page(s):243 - 248 vol.1
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (276 KB)

    The authors examine the effect of various Bt T,h combinations (Bt=premodulation filter bandwidth T=bit period, h=modulation index), various IF (intermediate frequency) filter types, and various IF filter bandwidths on the performance of a noncoherent GMSK (Gaussian minimum-shift keying) receiver. Numerical results are pres... View full abstract»

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  • Information distribution for network management in a multi-hop mobile packet-radio network

    Publication Year: 1989, Page(s):793 - 798 vol.2
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (572 KB)

    The authors present an efficient update procedure for stations in a multihop S-ALOHA packet radio network. Implicit acknowledgements (ACK/NAK) will be provided for point-to-point and broadcast communications. The simulation results show the mean delay of packets to stations in a 1-, 2- or 3-hop environment. The results indicate the admissible ratio of the generation probability q (packets... View full abstract»

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  • Phase locked transparent tone-in-band: an analysis [mobile radio]

    Publication Year: 1989, Page(s):73 - 77 vol.1
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (304 KB)

    The locking mechanism for transparent tone-in-band (TTIB) was analyzed. The major issue addressed was the phase error in recombining the subbands, especially when phase-lock is applied to data. The effect on BER (bit error rate) performance was evaluated, and it was demonstrated that the phase error φ should be held to 0.1 radians or less if degradation is not to exceed 1 db. The most signific... 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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  • Electronic beam squint tracking for land mobile satellite terminals

    Publication Year: 1989, Page(s):735 - 741 vol.2
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (452 KB)

    Preliminary results from an investigation of the applicability of the electronic beam squint (EBS) tracking technique to land mobile satellite terminals. Two systems are described, based on the EBS technique, which use both conventional waveguide and phased-array technology. Results are presented covering the error-detection capabilities of the systems, along with some operational analysis to illu... View full abstract»

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  • A study of performance degradation of small-cell radio systems caused by improper antenna positioning

    Publication Year: 1989, Page(s):832 - 838 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (448 KB)

    A major consideration in the design of cellular mobile radio systems is cochannel interference. The author reports the results of an extensive computer simulation study of the cochannel interference caused by imprecise antenna locations. Using the tenth percentile of the S/I (signal-to-interference) distribution of the mature system as a criterion, interference problems are investigated for variou... View full abstract»

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  • Computer investigation of telephone-traffic capacity for cellular mobile radio systems

    Publication Year: 1989, Page(s):504 - 507 vol.2
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    The authors provide tools for the investigation of the telephone-traffic capacity of cellular mobile systems with fixed, dynamic, and hybrid channel assignment schemes. The basic objectives considered in developing the tools are simplicity and ease of use, so that they can be of help to a wide audience of mobile radio engineers. For this purpose, a simple model of a cellular system is defined, and... View full abstract»

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  • An analysis of convolutional coding for land mobile channels

    Publication Year: 1989, Page(s):666 - 670 vol.2
    Cited by:  Papers (10)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (368 KB)

    The performance of convolutional coding is analyzed with reference to a land mobile radio channel. A two-state channel model is developed to determine the performance as a function of the probability of occurrence and duration of the fades. Using computer simulation, the relationship that exists between the Doppler frequency, the amount of diversity, the interleaving depth, and the bit error rate ... View full abstract»

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