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Vehicular Technology, IEEE Transactions on

Issue 4 • Date Nov. 1980

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Displaying Results 1 - 7 of 7
  • [Front cover and table of contents]

    Publication Year: 1980 , Page(s): c1
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    Freely Available from IEEE
  • Evaluation of cellular mobile telephone data receivers

    Publication Year: 1980 , Page(s): 353 - 360
    Cited by:  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (637 KB)  

    Some measurement techniques and results employed to evaluate advanced mobile phone system (AMPS) data receivers being driven by a Rayleigh fading channel are described. These performance measurements were used as a mechanism for comparing the design effectiveness of various bit clock recovery systems. Of five data receiver types evaluated, two models employed a full-wave rectifier in the bit clock recovery system. In this system nominal diode unbalance may cause the derived bit clock to lock 180° from the phase required to properly decode the incoming bit stream. This condition may even occur at high carrier-to-noise ratios when message structures containing long strings of ones or zeros are received. The other data receiver types employed digital signal processing for clock recovery to circumvent this phase ambiguity problem. The performance data of five data receivers are compared to noncoherent frequency-shift keying (FSK) as a model. In most cases, the test results are in good agreement with this model. The performance measurements presented include derived clock jitter and single and average bit error rates as a function of average carrier-to-noise ratios. The implementation of test instrumentation and the interpretation of test results are discussed. The objective is to stress the capability of simulation measurements to evaluate mobile receiver designs in a laboratory environment. View full abstract»

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  • A simple mathematical model of co-channel and adjacent channel interference in land mobile radio

    Publication Year: 1980 , Page(s): 361 - 364
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (435 KB)  

    A simple mathematical model is used to predict co-channel and adjacent channel interference effects in land mobile radio, valid for flat urban terrain. Results obtained, although oversimplified compared with real-life mobile radio systems, yield insights into the properties of differing types of modulation. View full abstract»

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  • Time diversity by pitch-synchronized interpolation

    Publication Year: 1980 , Page(s): 365 - 370
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (552 KB)  

    In mobile communications such as automobile telephone systems, an instantaneous interruption is caused by rapid fading, and speech quality is markedly deteriorated. A pitch-synchronized interpolation method is proposed to improve this quality. This method utilizes the fact that most speech signal regions have a pitch period. In this method, when an instantaneous interruption is detected at the receiver, a speech signal, which includes instantaneous interruption noise, is deleted and interpolated by repetition of the speech signal received one pitch interval wave before the instantaneous interruption. This method can be applied to receivers used in analog and digital transmission systems. A receiver using this method has been constructed, and it was shown that a 10-dB carrier-to-noise ratio (CNR) gain can be obtained by this receiver. View full abstract»

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  • Terrestrial/land mobile satellite considerations, NASA plans and critical issues

    Publication Year: 1980 , Page(s): 370 - 374
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    The land mobile market is reviewed briefly, and services that might be provided by hybrid terrestrial/land mobile satellite systems (T/LMSS) are discussed. In view of the expected urban/ suburban patterns of planned terrestrial systems it is suggested that a satellite may prove a cost-effective complement to terrestrial systems for serving thinly populated or large geographical areas. A basic land mobile satellite system (LMSS) is described, example applications are provided, and the status and rationale for LMSS frequencies in the 806-890 MHz band are given. Next, examples are given of NASA supported land mobile satellite experiments, and a preliminary T/LMSS work plan, part of an overall narrowband (NB) program, is presented for structuring future work. The initiation of the T/LMSS plan depends on pending management/budget decisions. In conclusion a listing of issues and potential problem areas are given, the solutions of which NASA believes are critical to the success of the proposed T/LMSS effort. View full abstract»

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  • On the steering of automated vehicles—A velocity-adaptive controller

    Publication Year: 1980 , Page(s): 375 - 385
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    A velocity-adaptive lateral controller is designed to meet requirements pertaining to lateral-position tracking accuracy, ride comfort, and an insensitivity to both changes in critical vehicle parameters and disturbance forces. This controller was tested under full-scale conditions wherein a wire-follower configuration and a dual-mode test vehicle were employed. The latter was automatically steered on straight sections of roadway at speeds up to 35.8 m/s, lane-changing maneuvers were performed up to this speed, and small-radius (100 m) curves were traversed at speeds up to 17.9 m/s. Excellent lateral control, close tracking, good insensitivity to disturbance forces, and a comfortable ride resulted; thus, a relatively simple controller can be effectively employed for nonemergency situations. View full abstract»

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  • [Back cover]

    Publication Year: 1980 , Page(s): c4
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    Freely Available from IEEE

Aims & Scope

IEEE Transactions on Vehicular Technology covers land, airborne, and maritime mobile services, vehicular electrotechnology, equipment, and systems identified with the automotive industry.

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Meet Our Editors

Editor-in-Chief
Yuguang Michael Fang
University of Florida