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38th IEEE Vehicular Technology Conference

15-17 June 1988

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Displaying Results 1 - 25 of 124
  • 38th IEEE Vehicular Technology Conference: 'Telecommunications Freedom - Technology on the Move' (Cat. No.88CH2622-9)

    Publication Year: 1988
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    Freely Available from IEEE
  • Queueing performance of voice-data frequency hopping networks with backoff

    Publication Year: 1988, Page(s):305 - 311
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (491 KB)

    A cellular FH/MFSK spread-spectrum mobile network with a total bandwidth in each cell of 2*W/sub ss/ is considered. There are two nonoverlapping channels within each cell, uplink and downlink, each with a bandwidth of W/sub ss/. The uplink channel handles information from the mobile units to the cell base station and the downlink channel directs information from the cell base station to the mobile... View full abstract»

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  • Managing cellular networks in the 1990s

    Publication Year: 1988
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    Summary form only given, as follows. The cellular phone business began barely five years ago with first generation systems in the 30 major metropolitan areas. These early systems consisted of a number of cell sites grouped around the local MTSO. They were frequently managed by inexperienced teams that found rudimentary ways to support operations, administration, and maintenance either manually or ... View full abstract»

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  • Operations tools for managing cellular networks

    Publication Year: 1988
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    Summary form only given, as follows. First-generation operation support tools for cellular networks were developed quickly by many different organizations to fill a void. While they fulfilled a need they were usually stand-alone tools, cumbersome, expensive to install and maintain, and had crude user interfaces. They required a skilled operator and produced results that were difficult to interpret... View full abstract»

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  • Networking-a key to the success of cellular

    Publication Year: 1988
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    Summary form only given. as follows, Networking of cellular switches or the ability to build area-wide or country-wide systems have proven to be one of the key factors of success in the penetration of cellular. Experiences of cellular networking, internationally and nationally, are reported. The use of the coming EIA standards and the evolution of cellular into a part of the intelligent telephone ... View full abstract»

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  • A microprocessor based route interlocking system for control of trains in railway yards

    Publication Year: 1988, Page(s):680 - 681
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (58 KB)

    Summary form only given. The design and development of a real-time control system called FIRM (fail safe interlocking system for railways using microprocessors) for control of trains in a station yard are considered. Route interlocking is described as a critical application involving human safety. The design is based on fail-safe principles where a fault in the system causes a safe reaction. An ap... View full abstract»

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  • Dynamic power control for FM channel management (cellular radio)

    Publication Year: 1988
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    Summary form only given, as follows. Dynamic power control is a technique that can be used in cellular radio systems to improve the quality of a call by dynamically managing the signal levels received by the subscriber unit and cell site during the routine progress of the call. An algorithm is described that is both easy to implement and works well in controlling the two major sources of degraded ... View full abstract»

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  • Probability of error analysis of digital partial response continuous phase modulation with discriminator detection in mobile radio channels

    Publication Year: 1988, Page(s):697 - 699
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (73 KB)

    Summary form only given. Future mobile radio systems are expected to provide high-quality voice and high-speed data transmission and to be integrated into the digital communication networks in several countries. The performance of some digital modulation techniques that are relevant for future mobile radio systems is studied. These techniques are characterized by having a constant envelope signal ... View full abstract»

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  • A Gilbert-like model for the mobile radio channel

    Publication Year: 1988
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (31 KB)

    Summary form only given, as follows. A novel approach to coding channel synthesis is proposed for the mobile radio channel, under the assumption that the system performance (i.e. P/sub e/ vs. SNR) in the absence of fading is known in advance. As an example the case of CPM with noncoherent demodulation is considered. On the basis of the P/sub e/-vs.-SNR curve, taking into account the threshold effe... View full abstract»

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  • A comparison of coherent and differentially coherent detection schemes for fading channels

    Publication Year: 1988, Page(s):364 - 370
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The common basis of coherent and differentially coherent detection is considered from the viewpoint of carrier recovery as the estimation of fading distortion. In the differentially coherent receiver a simple estimate of the fading distortion is used whereas the coherent receiver uses the optimal estimate. The bit error rates (BERs) for M-ary PSK (phase-shift keyed) and DPSK (double phase-shift ke... View full abstract»

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  • Spectral efficiency of cellular land mobile radio systems

    Publication Year: 1988, Page(s):616 - 622
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1872 KB)

    A rigorous and comprehensive approach to the definition and evaluation of spectral efficiency of cellular land mobile radio systems is presented. The method accounts for all pertinent system parameters within a cellular land mobile radio network. Subjective tests to evaluate the protection ratio for various systems is thought to be imperative to the evaluation of spectral efficiency. A comparison ... View full abstract»

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  • Estimate of channel capacity in Raleigh fading environment

    Publication Year: 1988, Page(s):582 - 584
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    The channel capacity in a Rayleigh fading environment has been derived. The result shows that the channel capacity in a Rayleigh fading environment is always lower than that in a Gaussian noise environment. In the digital transmission operating in a mobile radio environment which has Rayleigh fading statistics, it is important to know what the degradations are in channel capacity due to Raleigh fa... View full abstract»

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  • ASET voice coding-algorithm and implementation

    Publication Year: 1988, Page(s):134 - 138
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    The development and implementation of a medium bit-rate speech compression algorithm are reported. The algorithm, named adaptive subbands excited transform (ASET) coding, produces high-quality speech at relatively low computational complexity. Informal subjective testing of the algorithm showed no distortion or degradation in speech quality at 16 kb/s and only small degradation at 12 kb/s. In a fo... View full abstract»

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  • Spectrum efficiency potential of 25 kHz offset channel assignments in the 821-824/866-869 MHz public safety bands

    Publication Year: 1988, Page(s):358 - 363
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    The US Federal Communications Commission (FCC) recently allocated the paired bands of 821-824 MHz and 866-869 MHz to the Public Safety Radio Services and solicited comment on service rules and technical standards (Docket 87-112). The author examines the spectrum efficiency attainable through the use of 25-kHz offset channel assignments and contrasts it with that attainable via 12.5-kHz split chann... View full abstract»

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  • Performance of a mobile digital communication system

    Publication Year: 1988, Page(s):566 - 574
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1536 KB)

    An iterative method is used to calculate the time a transaction spends on the radio channel. The elapsed time of the transaction at other system components is calculated using either M/M/1 queuing or nonpreemptive priority queuing formulas. A specific system is used to demonstrate the calculations. Contention, received signal level, short-term fading, power-up time, unequal message lengths, multis... View full abstract»

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  • Location probability estimation of service availability in portable radio telephone systems

    Publication Year: 1988, Page(s):575 - 581
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    A location probability estimation method of service availability for portable units is proposed taking into consideration the given noise properties. A necessary carrier level or bit error rate at which quality is barely bearable is first defined. Location probabilities are estimated under the conditions of both Rayleigh fading and log-normal shadowing. Average carrier level required is generally ... View full abstract»

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  • Indoor propagation and bit error rate measurements at 60 GHz using phase-locked oscillators

    Publication Year: 1988, Page(s):127 - 133
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    The authors report propagation and bit error rate (BER) measurements that have been conducted within buildings using phase-locked oscillators at 60 GHz. The propagation measurements were conducted to study the envelope distribution, the power law with distance for different environments, the signal coverage, the received power spectrum, and edge diffraction effects. Measurements were also conducte... View full abstract»

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  • Software simulation for MSK and RC modulation schemes in time- and frequency-selective mobile radio channels

    Publication Year: 1988, Page(s):260 - 266
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The class of minimum shift keyed (MSK) and RC modulation schemes provides several properties useful in mobile radio, e.g. spectral efficiency, constant envelope, and moderate complexity. In order to profit from multipath reception, a data rate of 525 kHz, resulting in moderate bandwidth, is chosen. For the mobile radio channels, appropriate Gaussian wide sense stationary uncorrelated scattering (G... View full abstract»

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  • Performance of an adaptive multipath diversity receiver in a frequency selective Rayleigh fading channel

    Publication Year: 1988, Page(s):351 - 357
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    The performance of an adaptive multipath diversity receiver, operating in a quasi-static frequency selective Rayleigh fading channel, is considered. Phase coded direct sequence spread spectrum signaling is used. The receiver formulation is presented as an extension of a previously derived result by the authors (1988). Probability-of-error expressions are presented for channels with uniform and non... View full abstract»

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  • A new transmitter location searching algorithm based on geometric partitioning and local optimization

    Publication Year: 1988, Page(s):653 - 655
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    A vehicle location searching algorithm is described which uses phase ranging data from several base stations to calculate the position of the transmitter. The search algorithm is based on geographical partition and local optimization. Computer simulation shows that the algorithm gives fast, stable, and accurate results in a multipath transmission environment View full abstract»

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  • Reed-Solomon error and erasure correction for PAM/FM mobile radio systems

    Publication Year: 1988, Page(s):485 - 488
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1716 KB)

    FEC (forward error correction) coding and adaptive equalization are two signal processing techniques necessary to improve performance of digital land mobile radio systems. Here, interleaved RS (Reed-Solomon) block codes are used and a novel error and erasure correction technique is suggested. Performance is analyzed by computer simulation and compared against the simple error correction strategy, ... View full abstract»

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  • NTT's multi-beam mobile satellite communication system

    Publication Year: 1988, Page(s):689 - 691
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    Multibeam satellite communications system are being studied as the basis of an economical mobile satellite communication system. Design objectives of the multibeam satellite system, system applications to the mobile communication system, and experiment programs to implement a domestic commercial mobile satellite communications system are reported View full abstract»

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  • Radio channel structure for SCPC/FDMA digital mobile systems

    Publication Year: 1988, Page(s):623 - 628
    Cited by:  Papers (2)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    For an SCPC/FDMA digital mobile radio system, a channel structure supporting ISDN services is described. Three kinds of radio channels are proposed offering ISDN services with efficient spectrum utilization. They are: an information channel, control channel, and packet channel. The effects of diversity and FEC (forward error correction) are discussed for the improvement of digital transmission qua... View full abstract»

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  • Dual mode mobile unit for next generation digital narrow channel cellular telephone system

    Publication Year: 1988, Page(s):543 - 547
    Cited by:  Papers (2)  |  Patents (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    The topology required of a dual mode cellular telephone mobile unit, which can operate either in the conventional US 30 kHz analog FM mode or in a proposed 10 kHz digital channel is described. This 10 kHz channel is envisioned to be an important step in cellular mobile telephony because it triples the number of channels/MHz of bandwidth and provides error-controlled voice/data transmission with an... View full abstract»

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  • Improved frame synchronization for mobile packet radio systems with standard VLSI synchronous input/output devices

    Publication Year: 1988, Page(s):390 - 396
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    An improved frame synchronization technique is proposed for mobile and portable packet radio systems which use standard VLSI synchronous input/output (SIO) hardware devices for data transmission. This technique overcomes the performance limitations inherent in the SIO 2-byte hardware frame sync function by using a multiple-byte marker and additional software for frame sync. When compared to system... View full abstract»

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