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Wireless Communications, 1992. Conference Proceedings., 1992 IEEE International Conference on Selected Topics in

Date 25-26 June 1992

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  • 1992 IEEE International Conference on Selected Topics in Wireless Communications. Conference Proceedings (Cat. No.92TH0462-2)

    Publication Year: 1992
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    Freely Available from IEEE
  • 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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  • Communication protocols and on-board processor for a new national scale private mobile radio service [medical information environment]

    Publication Year: 1992, Page(s):147 - 150
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    A satellite-aided mobile radio communication service opens a new horizon of the integrated medical information environment. Doctors of medicine working on fixed or mobile stations, located in remote geographical areas, are able to communicate/cooperate each other by exchanging, handling and processing medical data simultaneously. The authors present a new national scale private mobile radio servic... View full abstract»

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  • Distributed architectures and databases for intelligent personal communication networks

    Publication Year: 1992, Page(s):300 - 304
    Cited by:  Papers (4)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    The provision of advanced network services for personal communications is dependent upon the intelligent network (IN). The physical location of IN service control logic and databases in the personal communication network (PCN) substantially affects the signalling and processing delay and is considered critical given the anticipated demand for PCS. The authors propose a MAN hierarchical design for ... 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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  • 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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  • Cable: a flexible transport infrastructure for PCS

    Publication Year: 1992, Page(s):296 - 299
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    Cable is a transport medium capable of providing a full range of narrowband and broadband applications. With the advent of hybrid fiber/coax transport facilities, cable is positioned to provide a transport medium superior to the telephone company local loop for broadband applications. Personal communications services (PCS) is a specific application that has caused the cable television industry to ... 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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  • 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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  • A novel multiple access scheme for third generation mobile/personal communication system

    Publication Year: 1992, Page(s):21 - 26
    Cited by:  Papers (1)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The importance of the data services for radio communication is growing. The paper proposes a novel accessing scheme which can efficiently support mixed (voice+data) service requirements on the future systems. For this work some comprehensive computer models were developed. Through these models, the proposed scheme was proved to operate efficiently in mixed traffic environments. Further improvement... 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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  • A hybrid medium access control protocol for wireless LANs

    Publication Year: 1992, Page(s):134 - 137
    Cited by:  Papers (9)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The author describes a medium access control protocol for efficient use of the radio channel in a cell. Channel time is structured as a sequence of frames of equal duration. The MAC protocol is a hybrid of centrally scheduled, contention-free data transfer (reservation-based) and decentralized, contention-based (slotted-ALOHA) protocols. The protocol relies on the use of broadcast messages from a ... View full abstract»

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  • Characterisation of the indoor mobile radio channel using a ray tracing technique

    Publication Year: 1992, Page(s):65 - 68
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    Investigation of the mechanisms of radio propagation in the indoor environment can only be performed using a detailed simulation of the environment. To this end, a model of the environment has been developed using ray tracing techniques. The model inherently incorporates the near-field effects of multipath environments where the transmitter and receiver are in close proximity. Statistical analysis... View full abstract»

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  • Natural sounding speech coder operating at 2.4 kb/s and below

    Publication Year: 1992, Page(s):176 - 179
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    Accurate representation of periodic speech segments is essential for synthesizing high quality digital speech at very low bit rates. For bit rates at 4.8 kb/s and below, conventional code excited linear prediction (CELP) does not provide the appropriate degree of periodicity. It has been suggested that good quality low bit rate speech can be obtained from frequency domain techniques such as STC, N... 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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  • Requisite semiconductor advances for consumer digital radio equipment

    Publication Year: 1992, Page(s):223 - 226
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    Increasing demand for wireless communications services in countries where most frequencies are already allocated means that time must become a multiplexing parameter. Even though time division multiplexing equipment has been used for many years, there have been few instances where time has been used in consumer equipment and even fewer instances involving battery-powered consumer equipment. Digita... View full abstract»

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  • The Canadian MSAT Field Trials Program

    Publication Year: 1992, Page(s):376 - 378
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The Canadian Department of Communications is providing a multi-year program for implementation of market trials involving the introduction of new MSAT services in Canada. The author describes the Department's Field Trials Program that commenced in late 1990. The Trials Program includes end-users requiring wide-area portable communications or fixed wide-area communications for the monitoring of rem... View full abstract»

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  • Network aspects of the UMTS

    Publication Year: 1992, Page(s):16 - 20
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The Universal Mobile Telecommunication System (UMTS) is a concept for a third generation mobile telecommunications system. It is to be a system for a wide range of mobile services provided in different service environments, thereby supporting many mobile telecommunications applications. The UMTS is studied in the RACE programme. The paper focuses on the network aspects of the UMTS. Particularly, t... 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 (31)
    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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  • Wireless rural communication systems for developing countries

    Publication Year: 1992, Page(s):254 - 256
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    Describes briefly a low cost TDM/TDMA point to multipoint (PMP) system, which has been designed jointly by C-DOT and the Indian Institute of Technology, Madras. The TDM/TDMA PMP rural radio system has been designed to provide telecommunication facilities in rural areas where subscriber density and traffic are low. The system can be configured to provide two types of applications, one as a stand-al... 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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  • TS-TBCR: an access protocol for wireless LANs

    Publication Year: 1992, Page(s):130 - 133
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The authors propose a time split channel access with token based contention resolution (TS-TBCR) protocol for integrated voice and data applications on wireless LANs. This protocol provides perfect scheduling by reserving a small bandwidth for contention resolution. This guarantees contention resolution before the start of an information slot thus preventing collisions and conserving bandwidth. Fo... View full abstract»

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  • Optimization of antenna systems for automatic high frequency communication systems [marine communications]

    Publication Year: 1992, Page(s):462 - 465
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    Many HF (high frequency) communication systems have been developed which automatically select operating frequency, route calls, correct transmission errors and log activity. Often these systems do not meet the reasonable expectations of the user because the antenna systems are deficient. The author discusses the special requirements of automatic HF systems, the deficiencies of commonly used antenn... View full abstract»

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  • The probability of error for optimum detection on the two wave Rayleigh fading channel

    Publication Year: 1992, Page(s):61 - 64
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The indoor wireless channel (20-60 GHz) can be modeled by a two wave Rayleigh model. The authors consider the optimum detector for equal energy signals on the two wave Rayleigh fading channel with known delay. They obtain upper and lower bounds on the probability of error when communicating on this channel using signals with nonzero complex cross-correlation. The bounds obtained converge to an exa... View full abstract»

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  • Spectral reuse with independent CDMA systems in a shadowed environment

    Publication Year: 1992, Page(s):211 - 214
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    The mutual interference caused by independent terrestrial-radio CDMA systems located in close proximity is investigated. The effects of propagation law, log-normal shadowing, and base station separation on the capacity of the CDMA systems are analyzed View full abstract»

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