1992 IEEE International Conference on Selected Topics in Wireless Communications

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
  • 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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  • 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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  • 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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  • Wireless communications using Ka band satellites

    Publication Year: 1992, Page(s):419 - 422
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    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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  • 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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  • Detection system of the narrow band PSK communication

    Publication Year: 1992, Page(s):417 - 418
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (100 KB)

    In narrow band PSK systems where the synchronous detection circuit is constructed by using a highly stable PLL circuit, the lock-in time is reduced during the reference carrier regeneration. An experimental two-phase narrow band PSK detection circuit was thus constructed by using a retriggerable monostable multivibrator. This detector is simple and stable View full abstract»

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  • The electronic receptionist: a knowledge-based approach to personal communications

    Publication Year: 1992, Page(s):310 - 313
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    Proposed personal communications services will allow their users to be accessible anywhere and any time. Informal investigations with potential users revealed that these services would not be widely accepted without effective call prioritization and screening, akin to that provided by a human receptionist, to limit which calls get through and which are routed to colleagues or to voice messaging. A... View full abstract»

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  • Switched diversity on Nakagami channels

    Publication Year: 1992, Page(s):231 - 234
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The authors analyze the performance of a switched diversity system operating on nonselective Nakagami fading channels. The analysis is based on a discrete time model, i.e. one switches only at discrete instants of time t=nT, where n is an integer and T is the symbol duration. They propose the following switch-and-stay strategy. Assuming a two-branch diversity system and that antenna 1 is being use... 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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  • A packet based system for cellular digital mobile radio applications

    Publication Year: 1992, Page(s):27 - 30
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    Third generation mobile radio systems will be required to operate in a wide variety of environments from indoor picocells to outdoor macrocells. In addition the range of services accommodated will increase relative to existing systems. The implications are that a single air interface is unlikely to satisfy overall demands and that the emphasis must therefore be on flexibility. The paper examines t... View full abstract»

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  • Performance evaluation of error control protocols in mobile satellite communications

    Publication Year: 1992, Page(s):368 - 371
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    An analytical approach is employed to evaluate the coding gain of delay-limited adaptive error control (DAEC) protocols on mobile satellite channels. By using this approach the power savings offered by various error control protocols can be compared on a common basis. DAEC protocols are designed to make efficient use of a small number of feedback signals (with or without retransmissions) to combat... 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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  • Standardization activities on 8-kbit/s speech coding in CCITT SGXV

    Publication Year: 1992, Page(s):188 - 191
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    The CCITT (International Telegraph and Telephone Consultative Committee) Study Group XV is in charge of studies on speech processing. SGXV has already drafted standard G.728 for a 16-kbit/s low-delay speech coding algorithm and is now studying 8-kbit/s speech coding algorithms. The paper reviews the recent activities of SGXV/WP2 on 8-kbit/s speech coding algorithm. These activities include discuss... View full abstract»

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  • Network architecture and signalling for urban personal communications

    Publication Year: 1992, Page(s):305 - 309
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    To facilitate early deployment of the personal communication network (PCN), efficient use of existing public network resources must be realized. Additionally, it is proposed that to accommodate the processing load arising from the anticipated demand for personal communications, call control functions should be distributed at low levels within the network. An integrated network architecture approac... View full abstract»

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  • Adaptive RAKE system for mobile communications

    Publication Year: 1992, Page(s):227 - 230
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The authors propose an adaptive RAKE receiver, which does not need to send the sounding signals and can track the phase fluctuation caused by fading. Consequently coherent demodulation is able to be applied and this system shows good performance without sounding signals. Its usefulness is confirmed by computer simulations 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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  • Atmospheric near infrared communications at CEPT-1 rate

    Publication Year: 1992, Page(s):266 - 270
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    Presents the design principles and experimental development of an atmospheric digital transmission system operating in the near infrared region at 2.048 Mbps data rate, using semiconductor laser transmitters and silicon photodetectors with reflective collimation and focusing optics 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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  • Nonlinear CPFSK trellis modulation codes

    Publication Year: 1992, Page(s):364 - 367
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    Several nonlinear trellis modulation codes based on multilevel continuous-phase frequency-shift-keying (M-CPFSK) are presented. On additive white Gaussian noise (AWGN) channels, these digital FM schemes achieve higher minimum Euclidean distances and memory lengths than the conventional CPFSK signals View full abstract»

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  • Performance of dynamic channel assignment techniques in a cellular environment

    Publication Year: 1992, Page(s):340 - 343
    Cited by:  Papers (1)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    Dynamic channel assignment (DCA) techniques have been applied to European cordless telephone systems such as CT2 and DECT, however the technique is yet to be applied practically to cellular systems. The author reports on the performance of several dynamic assignment techniques for cellular applications in terms of capacity and outage making comparisons with more conventional fixed channel assignme... View full abstract»

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  • Multipath diversity reception of hybrid DS-SFH spread spectrum multiple access over Rician multipath fading channels

    Publication Year: 1992, Page(s):433 - 436
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The authors analyze the performance of multipath diversity reception of a noncoherent hybrid direct sequence-slow frequency hopping (DS-SFH) spread spectrum multiple access (SSMA) communication system which is used in indoor environments characterized by a Rician multipath fading channel model. By applying a Gaussian process assumption for the sum of the multiple access interference and noise, an ... View full abstract»

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  • Health considerations for portable transceivers

    Publication Year: 1992, Page(s):409 - 412
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The use of hand-held communication transceivers has become widespread and is further growing. Because these devices are used in close proximity of the human head, questions have been asked regarding safety of their use. An overview is given of research on radiofrequency/microwave energy deposition, relevant biological effects, and a perspective from some national health standards point of view View full abstract»

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