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1992 IEEE International Conference on Selected Topics in Wireless Communications

25-26 June 1992

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Displaying Results 1 - 25 of 113
  • 1992 IEEE International Conference on Selected Topics in Wireless Communications. Conference Proceedings (Cat. No.92TH0462-2)

    Publication Year: 1992
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  • An overview of recent field tests demonstrating the use of CDMA for personal communications networks

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (54 KB)

    Summary form only given. Provides an overview of recent field test results that have been obtained on the performance of a CDMA personal communications network (PCN) designed to share common spectrum with narrowband microwave signals in the 1850-1990 MHz region. That is, the PCN is designed to overlay a frequency band which is currently occupied by signals from microwave users such as utility comp... View full abstract»

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  • Discussion of spectrum efficiency and the factors that affect it

    Publication Year: 1992, Page(s):413 - 416
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (411 KB)

    Spectrum efficiency has become an important topic in the wireless communications industry due to the constant search for more capacity. Yet, there is much confusion about how to assess spectrum efficiency, for various technologies and situations, particularly in conjunction with other objectives such as cost and quality. The author presents a unified approach for the assessment of spectrum efficie... View full abstract»

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  • Cryptographic security techniques for digital mobile telephones

    Publication Year: 1992, Page(s):425 - 428
    Cited by:  Papers (6)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (566 KB)

    The authors deal with the application of cryptographic techniques to digital mobile telephones, particularly with regard to the authentication of mobile subscribers. The analysis presented is based on the ETSI GSM900/DCS1800 system. The principles discussed are essentially applicable to all digital cordless and cellular telephone systems. The aspects discussed regard the choice of cryptographic al... View full abstract»

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  • Digital modulation performance assessment for the GTE Airfone GenStar system

    Publication Year: 1992, Page(s):449 - 452
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The second generation GTE Airfone Public Correspondence System, GenStar, will employ digital transmission to improve performance, increase service offerings and provide for future capacity enhancements. With 6 kHz channel spacing and an aggressive throughput target, high-level modulation schemes were considered early in the system design. By analysis and measurement, 16 QAM was determined to be a ... View full abstract»

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  • Cellular control channel performance in noise interference and fading

    Publication Year: 1992, Page(s):328 - 331
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    The author presents a theoretical performance analysis of the cellular control channel with an estimation of its effective capacity. Both forward and reverse control channels (FOCC & RECC) are examined in the presence of interference and Rayleigh fading and prediction equations are developed. It is shown that the control channel capacity is a function of carrier-interference ratio and Rayleigh... View full abstract»

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  • The advantages of using cable TV distribution plant for linking PCS-microcells

    Publication Year: 1992, Page(s):292 - 295
    Cited by:  Papers (2)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    It has been suggested by a number of organizations that existing cable television distribution plant be used to interconnect microcell equipment. Taking advantage of the broadband and near ubiquitous nature of cable plant, it has been further proposed that the microcell equipment consist of RF repeaters that simply translate off-air mobile voice traffic onto the cable plant and vice versa. This ap... View full abstract»

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  • Suppression of narrow-band interference in FFH systems by hard-limited combining receiver using transversal filters

    Publication Year: 1992, Page(s):445 - 448
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    The performance of a hard-limited combining receiver using fractional tap spacing transversal filters in fast frequency hopping (FFH) systems in the presence of narrowband interference is considered. When narrowband interference affects some frequency slots, the bit error rate (BER) performance of a conventional hard-limited combining receiver has an error floor according to the number of hops bit... View full abstract»

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  • Voiceband modem control algorithm for improving image quality of mobile telephone facsimile

    Publication Year: 1992, Page(s):324 - 327
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The authors describe the control algorithm of V.27ter voiceband modem function for improving the image quality of mobile telephone facsimiles and present the results of field experiments to verify the effectiveness of that algorithm. First, impairments unique to the mobile telephone network, in which an analog cellular system is connected with the public switched telephone network (PSTN), are desc... View full abstract»

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  • Interlace coding system to avoid error propagation of source coding systems

    Publication Year: 1992, Page(s):80 - 83
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    An interlace coding system to avoid error propagation of source coding systems is proposed and its error performance on additive white Gaussian noise (AWGN) channel with quadrature phase shift keying (QPSK) is analyzed. The proposed system handles data compression, data encryption and error correcting processes together, i.e. adds error correcting redundancy to the block lists of the dictionary wh... View full abstract»

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  • A multi-channel infrared telephony demonstration system for public access applications

    Publication Year: 1992, Page(s):286 - 291
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Discusses the application of free-space optical links for public access (Telepoint) telephony service. The design considerations for such an application are described which lead to the selection of a modulation scheme and architecture for an experimental demonstration system. Some novel techniques for improving performance, including extending range and limiting interference, are presented. The pe... View full abstract»

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  • Spread spectrum transmission in the 902-928 MHz band

    Publication Year: 1992, Page(s):441 - 444
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The 902-928 MHz band has been assigned, on a nonprotected basis, to unlicensed spread spectrum devices subject to the constraints outlined in DOC TR76 and FCC Part 15.247. The rules allow for direct sequence, frequency hopping and combinations of both. The specified operating parameters, interference environment and typical propagation conditions suggest certain limitations which may not be consis... View full abstract»

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  • Dual channel OCUM protocol for wireless LANs

    Publication Year: 1992, Page(s):143 - 146
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    Dual channel operation of an optimum channel utilization multiaccess (DC-OCUM) protocol using the busytone concept for fully connected and homogeneous broadband wireless LANs is considered. The DC-OCUM protocol uses two independent message and busytone channel pairs. The message channels are synchronised slotted channels with slot size equal to one packet duration and the busytone channels indicat... View full abstract»

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  • Data transmission performance of existing circuit switched modems and protocols over analog cellular networks

    Publication Year: 1992, Page(s):318 - 323
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    PacTel Corporation evaluated the performance of various laptops, modems and cellular phones for mobile data communications. Commercial versions of different modems and protocols were tested over a combination of analog cellular network and PSTN. Tests were conducted from a moving mobile in a high usage cellular system. Results indicate that the analog cellular network may be commercially utilized ... View full abstract»

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  • Systems issues in wireless communications

    Publication Year: 1992, Page(s):423 - 424
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The development of technology to permit nearly ubiquitous wireless personal communications is proceeding rapidly. However, most activity focuses on the technology, and not on how it will be integrated into the existing telecommunications infrastructure or how it will deal with user interface issues. These issues are critical to the success of personal wireless communications. Ubiquitous personal c... View full abstract»

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  • High-resolution spectral analysis techniques for estimating the impulse response of indoor radio channels

    Publication Year: 1992, Page(s):57 - 60
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    The authors present a new approach for estimating the impulse response of indoor radio channels. The technique is based on the use of (1) the information theoretical criteria, (2) a high-resolution spectral analysis technique, and (3) the principal component analysis. It is shown that the new technique can be used to overcome difficulties experienced by conventional methods and, as a result, is ab... View full abstract»

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  • Reed-Solomon error control systems for bidirectional fading channels

    Publication Year: 1992, Page(s):76 - 79
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Various properties unique to Reed-Solomon codes can be used to full advantage in the development of error control systems for bidirectional wireless communication systems. An analytic framework is provided for the computation of error and erasure rates at the input to the Reed-Solomon decoder after transmission over a Rayleigh fading channel. A simple method is then demonstrated for using a bounde... View full abstract»

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  • Free-space, undirected infrared (IR) voice and data communications with a comparison to RF systems

    Publication Year: 1992, Page(s):279 - 285
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    A practical, undirected, incoherent IR communications system for indoor and outdoor use. The limitations encountered in both the indoor and outdoor environments are discussed and a link analysis comparison of the two cases is presented. A brief comparison of IR and RF is given listing the advantages and disadvantages of each. Finally, future trends in the area of wireless, undirected communication... View full abstract»

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  • Chaotic sequences for spread spectrum: an alternative to PN-sequences

    Publication Year: 1992, Page(s):437 - 440
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    A new class of signature sequences for use in direct sequence spread spectrum (DS/SS) communication systems is proposed. In arriving at these new sequences, the theory of chaos has been used. The correlation properties of these chaotic sequences are similar to random white noise. Their noise-like characteristics are explained. The numbers and lengths of chaotic sequences are not restricted like View full abstract»

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  • A performance comparison and evaluation of two GMSK radio modem designs: a DSP algorithm versus a discreet component implementation

    Publication Year: 1992, Page(s):154 - 157
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    The RAM Mobile Data nationwide packet radio system utilizes portable and mobile access devices to allow subscribers to communicate using short bursts of data. Cost-effective approaches for implementation of a GMSK modem that would match the operational requirements of the specified wireless protocol of RAM network are compared. The DAP modem implementation is a useful approach to consider in evolv... View full abstract»

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  • Synergy between satellites and the pan-European GSM digital cellular system

    Publication Year: 1992, Page(s):372 - 375
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    The authors propose a space segment which provides global satellite for mobile communications compatible, mobile communications in the European region. The system will use a three-satellite TUNDRA orbit constellation of eccentricity 0.15 band limited quasi-synchronous CDMA is the proposed access method. A circularly symmetric 7 spotbeam coverage of Europe is proposed. The system architecture and p... View full abstract»

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  • Channel coding and antenna diversity trade-offs for indoor wireless channels

    Publication Year: 1992, Page(s):402 - 405
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The trade-off between channel coding and antenna diversity will be a major design consideration for third generation portable transceivers. Channel coding typically represents one the most attractive means of approaching the performance limits predicted by information theory while antenna diversity is used to combat signal fading as well as cochannel interference. In view of the advent of reduced-... View full abstract»

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  • Communications requirements of multimedia applications: a preliminary study

    Publication Year: 1992, Page(s):138 - 142
    Cited by:  Papers (10)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    A preliminary study is presented that provides a framework to explore the communications requirements of wireless applications in general, with emphasis on multimedia applications. An estimate of bandwidth requirements for various basic common applications are given, from which network bandwidth requirements in different scenario can be evaluated. The delay and error characteristics for certain mu... View full abstract»

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  • Network management for wireless communications

    Publication Year: 1992, Page(s):314 - 317
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    Network management technologies are being developed rapidly in recent years, primarily for the fixed network environment. The paper examines some unique characteristics pertaining to the wireless communications environment which dictate various network management capabilities and the designs of the communications equipment. It also provides an example to illustrate the evolution of these capabilit... View full abstract»

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  • Wireless communications using Ka band satellites

    Publication Year: 1992, Page(s):419 - 422
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Personal communications will be supported in metropolitan areas using terrestrial-based transmission means and the L-band portion of the frequency spectrum. On the other hand, satellite communications' global coverage makes it attractive to provide service to remote areas. Ka-band offers several advantages to support such services, notably the abundant spectrum space available. The service concept... View full abstract»

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