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40th IEEE Conference on Vehicular Technology

6-9 May 1990

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Displaying Results 1 - 25 of 132
  • 40th IEEE Vehicular Technology Conference. On the Move in the 90's (Cat. No.90CH2846-4)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (354 KB)
    Freely Available from IEEE
  • Vehicle distance sensor using a segmented IR laser beam

    Publication Year: 1990, Page(s):107 - 112
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The determination of relative distances and relative speeds between vehicles is a prerequisite for the implementation of features like collision avoidance or automatic guidance in vehicle control systems. An experimental optoelectronic system for this purpose that is based on a multisegment infrared laser emitter and receiver system using no moving parts is described. The multisegment distance mea... View full abstract»

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  • A computer algorithm for prediction of service area in a mobile radio communication system

    Publication Year: 1990, Page(s):384 - 389
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    A computer algorithm for predicting the service area of a specified percentage of locations that are required to be covered is developed. An empirical formula for performance margin (PM) as a function of frequency (f) and probability of communication (Px) is derived. This is presented in the form PM=( A+BPx+Clog Px View full abstract»

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  • Multichannel access protocol for satellite mobile data services

    Publication Year: 1990, Page(s):714 - 719
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    A complete set of access protocols for multiple satellite channels assigned for communications between mobile data terminals and fixed data hubs is proposed. The protocols address three types of data bearer services suitable for all types of applications. Multiple access for inbound interactive messages is based on contention for short messages and reservation for longer messages. An overview of t... View full abstract»

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  • Inductive power transfer to an electric vehicle-analytical model

    Publication Year: 1990, Page(s):100 - 104
    Cited by:  Papers (44)  |  Patents (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    The roadway powered electric vehicle (RPEV) system is a unique electric vehicle system that receives electric power by inductive coupling from an inductor buried beneath the road surface. The analytical model of the system that transfers power from the wayside to the vehicle battery and DC traction motor is analyzed. This model includes the roadway inductor, the vehicle-mounted pick up inductor, a... View full abstract»

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  • MSRFM-a prediction tool for radio system design

    Publication Year: 1990, Page(s):378 - 383
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (676 KB)

    The development and evolution of a versatile radio propagation and performance modeling system known as MSRFM (multisite RF model) is described. The modeling system consists of four major functional classifications: (a) the propagation model (MSRFM), (b) database utilities, (c) analysis programs, and (d) a plotting program (MSPLOT). Database and device support utilities are used initially to digit... View full abstract»

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  • Adaptive linearisation using pre-distortion

    Publication Year: 1990, Page(s):35 - 40
    Cited by:  Papers (27)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    One method of linearisation for class C RF power amplifiers is to pre-distort the drive signal. It is necessary to adjust the pre-distort waveform so that it can track changes in amplifier characteristics. An adaptive predistortion technique which uses a digital signal-processing microprocessor and memory look-up tables is described. The method differs from a previously described adaptive predisto... View full abstract»

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  • Communications service provision to land mobiles in northern Europe by satellites in high elevation orbits-propagation aspects

    Publication Year: 1990, Page(s):706 - 713
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    An experiment aimed at determining L-band fade statistics for future European land mobile satellite systems is described. During measurement trials, an aircraft was used to simulate a high-elevation orbit satellite whose transmissions were received by a land mobile unit. On the ground, signal-level statistics were measured as a function of two main variables: mobile environment and transm... View full abstract»

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  • Propagation measurements for microcells in central Stockholm

    Publication Year: 1990, Page(s):539 - 541
    Cited by:  Papers (30)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    Propagation measurements were made for microcells implemented using low omnidirectional antennas. 20 sites in a flat, homogeneous area of Stockholm were used. The transmitting antennas and the mobile receiving antenna were 5 m and 2 m in height, respectively. Each base station transmitted at a unique frequency in the vicinity of 870 MHz. The radio wave propagation along streets and around corners ... View full abstract»

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  • Narrowband FM cellular system

    Publication Year: 1990, Page(s):237 - 243
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    The voice and data transmission parameters of a spectrally-efficient analog frequency division multiple access (FDMA) cellular system with 12.5 kHz channel assignments are described. Low-speed 100 bit/s Manchester data is transmitted during voice activity and provides channel control. In addition, 200 bit/s baseband data patterns support channel supervision. The use of this subaudible signaling me... View full abstract»

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  • Design features of a premises cordless telephone system

    Publication Year: 1990, Page(s):178 - 182
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The premises cordless telephone (PCT) system provides a full function access to PSTN (public switched telephone network) subscriber lines via an existing PBX (private branch exchange) and/or a single controller or a network of controllers. The system enhances corporate communications by giving callers direct dial-through access to executives on the move and engineers and technicians working out of... View full abstract»

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  • BER performance of anti-multipath modulation PSK-VP and its optimum phase-waveform

    Publication Year: 1990, Page(s):412 - 419
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    A novel antimultipath modulation method, called PSK-VP (phase shift keying with varied phase), in which a varied phase-waveform is redundantly imposed on the DPSK timeslot is proposed. The optimum phase-waveform is discussed by using an approximate analysis based on a special diversity with a continuous branch. A formula-type bit error rate (BER) expression is obtained by the analysis and shows th... View full abstract»

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  • Performance of multi-level QAM with maximal ratio combining space diversity for land mobile radio communications

    Publication Year: 1990, Page(s):459 - 464
    Cited by:  Papers (17)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A novel type of space diversity with maximal ratio combining for multilevel quadrature amplitude modulation (QAM) in land mobile communications to improve transmission performance is proposed. In order to realize maximal ratio combining space diversity for QAM, a novel type of diversity combining method using a pilot symbol insertion type fading estimator is applied. The proposed diversity combini... View full abstract»

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  • ATCS RF channel modeling using computer aided engineering

    Publication Year: 1990, Page(s):92 - 99
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    A computer model designed to analyze the data communications network of the advanced train control system (ATCS) is discussed. The model was developed using Network II.5, which includes the hardware components and communication protocol of the ATCS data communications network. The model includes the RF channel access mechanism with busy bits. The effect of RF propagation on the system is modeled b... View full abstract»

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  • The effect of channel errors on a contention-based reservation TDMA protocol

    Publication Year: 1990, Page(s):372 - 377
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    Contention-based time-division multiple access (TDMA) protocols have good performance in applications such as a very small aperture terminals, with medium to heavy traffic when the channel is error free. For the protocol to operate in a channel that may contain errors, a modified protocol is proposed. Results derived include the average frame length, the average number of waste slots, the average ... View full abstract»

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  • On the behavior of the LINC transmitter

    Publication Year: 1990, Page(s):29 - 34
    Cited by:  Papers (37)  |  Patents (60)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The effects of RF signal processing impairments in a LINC transmitter are analyzed. A theoretical analysis of the effect of three different kinds of imbalances between the parallel signal paths in a real LINC transmitter is presented. These include the power gain and delay (or phase) imbalance between the two RF paths and the different nonlinear characteristics of both RF power amplifiers. In all ... View full abstract»

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  • Mobile satellite system performance through simulation

    Publication Year: 1990, Page(s):701 - 705
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    A simulator for mobile satellite system (MSS) link simulation is described. The simulation consists of two elements which evolved separately. The propagation simulator is used to produce fade data and statistics under a variety of path conditions. The channel simulator produces bit error rates (BER), under real propagation conditions, for several coding/modulation formats. The propagation simulato... View full abstract»

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  • Selection diversity reception based on cross-channel-interference measurement for digital mobile radio

    Publication Year: 1990, Page(s):533 - 538
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    An antenna pattern diversity reception (APDR) system with a selection strategy based on the measurement of cross-channel-interference which has been confirmed to be a linear function of the multipath RMS delay spread, assuming BPSK as an example, is proposed. Theoretical analysis and computer simulation have been performed to study the effects of an APDR system with minimum RMS delay spread branch... View full abstract»

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  • Mobile satellite broadcast system design

    Publication Year: 1990, Page(s):233 - 236
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    An innovative mobile satellite network that will broadcast data and audio signals (voice and music) to mobiles throughout the contiguous United States through MSAT, a North American mobile satellite system now under construction, is described. Mobiles with suitably equipped radios and small L-band omnidirectional mobile satellite antennas simultaneously receive one data channel and any on... View full abstract»

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  • Experimental digital cellular system for microcellular handoff

    Publication Year: 1990, Page(s):172 - 177
    Cited by:  Papers (4)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    An experimental digital cellular system composed of a private branch exchange (PBX)-based MSC (mobile switching center), three base stations, two mobile stations, and a radio channel simulator, is developed. The system uses a mobile originated handoff process; i.e. a mobile station requests a handoff to the MSC based on signal strength from surrounding base stations. All control channels are multi... View full abstract»

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  • Noncoherent block demodulation of PSK

    Publication Year: 1990, Page(s):407 - 411
    Cited by:  Papers (18)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Noncoherent demodulation of phase shift keying (PSK) over a multisymbol observation interval is considered. It is shown that by performing noncoherent demodulation over an increased observation interval, the performance approaches that of coherent PSK. This block demodulation technique of PSK is a natural generalization of differentially coherent detection, and yields improved signal-to-noise rati... View full abstract»

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  • Control channel structure for TDMA mobile radio systems

    Publication Year: 1990, Page(s):270 - 275
    Cited by:  Papers (11)  |  Patents (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    A control channel structure for time-division multiple access (TDMA) mobile radio systems that must offer high system capacity and ISDN services is described. This structure overcomes the difficulties in random access efficiency and the application of a layered protocol. A functional channel definition and layered signaling frame format are described. Functional channel mapping on physical channel... View full abstract»

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  • Performance of trellis coded modulation using multi-frequency channels in land mobile communications

    Publication Year: 1990, Page(s):455 - 458
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    A multifrequency channel transmission method for trellis-coded quadrature amplitude modulation (QAM) that uses an interleaving function to improve bit error rate (BER) performance under Rayleigh fading environment conditions is described. A multifrequency channel transmission method for trellis-coded modulation (TCM) that uses interleaving is proposed to distribute the burst error that occurs in t... View full abstract»

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  • Electromagnetic-induction vehicle sensor detecting the gradient of magnetic flux

    Publication Year: 1990, Page(s):86 - 91
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    A stable and highly reliable electromagnetic-induction-type vehicle sensor that takes appearance, installation, and maintenance into consideration is developed. It utilizes the electromagnetic coupling of two kinds of ferrite coils. This sensor detects the magnetic field generated by one ferrite coil with the other ferrite coil, and detects the presence of a vehicle from the minute change in the m... View full abstract»

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  • Indoor wideband radio propagation measurement system at 1.3 GHz and 4.0 GHz

    Publication Year: 1990, Page(s):626 - 630
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    The development and operation of a dual-band time-domain radar system used to measure indoor multipath propagation characteristics in several office buildings and factories are described. The system operates at 1.3 GHz and 4.0 GHz and uses 4-ns RMS pulses to provide estimates of indoor radio channel impulse responses. The effects of antenna diversity, frequency scaling, and topography on indoor ra... View full abstract»

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