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Universal Personal Communications, 1994. Record., 1994 Third Annual International Conference on

Date Sept. 27 1994-Oct. 1 1994

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Displaying Results 1 - 25 of 134
  • Proceedings of 1994 3rd IEEE International Conference on Universal Personal Communications

    Publication Year: 1994
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    Freely Available from IEEE
  • A statistical model of mobile signal reception

    Publication Year: 1994, Page(s):150 - 154
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    A new model is proposed to predict the mobile signal statistics for systems where diversity is implemented at the base station. Based on the model, analytical expressions for envelope correlation of the signal received at the mobile are obtained as a function of the mean distance of active scatterers from the mobile as well as the frequency and space separations used at the base. Unlike previous r... View full abstract»

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  • On the BER performance of digital demodulators using fixed point FIR interpolators

    Publication Year: 1994, Page(s):215 - 219
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Due to their rapid acquisition performance, feedforward symbol timing estimation techniques are advantageous in digital demodulators used for packet based communications systems and communications systems which suffer from fading phenomena. When feedforward symbol timing estimation is used in a demodulator which is implemented using digital techniques, feedforward interpolation is required to re-s... View full abstract»

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  • Integration of space and terrestrial PCS in the information infrastructure

    Publication Year: 1994, Page(s):455 - 459
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    The emergence of national and global information infrastructures (NII/GII) has been receiving considerable attention and emphasis across many domains, including both technical and political communities. The paper examines considerations for efficient integration of satellite and terrestrial PCS into the fabric of the NII and GII, with emphasis on interoperability among wireless systems themselves ... View full abstract»

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  • Radiowave propagation measurements for sharing spectrum between point-to-point microwave radios and personal communications systems

    Publication Year: 1994, Page(s):262 - 266
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    A CW radiowave propagation experiment was performed to study spectrum sharing possibilities in the New York City region. The results showed that the isolation measured between the microwave and a PCS system on the street was more dependent upon building shadowing and street orientation within the city than on the distance between the two systems for distances less than 20 km. At greater distances,... View full abstract»

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  • Time-reversed infinite impulse response filtering in digital communications receivers

    Publication Year: 1994, Page(s):220 - 224
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    The order in which samples entering a communications receiver are processed does not need to match the order in which they are collected. For instance, samples could be processed starting with the last one received and then proceeding to the first one, When applied to infinite impulse response filtering, time reversal can enhance and simplify equalization functions that are typically handled by fi... View full abstract»

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  • The (GSM) HLR-advantages and challenges

    Publication Year: 1994, Page(s):335 - 339
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    The GSM standard is one of the first network architectures to make use of the potential of a centralized, stand-alone network database containing subscriber data that can be queried and copied to remote databases at subscriber mobility (roaming). Such a database within GSM is referred to as the HLR (home location register). There is an inherent conflict in the fact that subscriber mobility and net... View full abstract»

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  • Emerging standards for PCS traffic performance

    Publication Year: 1994, Page(s):581 - 585
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Delays in accessing the service (delays in user/terminal authentication or call set up) and/or denial of service due to non-availability of resources (call blocking, hand-off failure) are key traffic performance parameters for PCS (personal communication service). These parameters will have a significant impact on the quality of service perceived by the end users of PCS. Suitable standards (target... View full abstract»

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  • MSS architectures for 21st century wireless communications

    Publication Year: 1994, Page(s):460 - 464
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    Future Public Land Mobile Telecommunications Systems (FPLMTS) are third generation mobile systems (TGMS) which are scheduled to start service around the year 2000. The objective of FPLMTS is to provide personal, portable communications anywhere, anytime. In FPLMTS there will be a satellite component and a terrestrial component. The advantage of the satellite component is that FPLMTS services can b... View full abstract»

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  • Acquisition of synchronism in direct sequence CDMA mobile networks

    Publication Year: 1994, Page(s):68 - 72
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Code division multiple access (CDMA) is being proposed as a powerful spectrum sharing technique. Rejection of multiple access interference (MAI) is achieved by the cross-correlation properties of the selected code family. However, before the receiver has acquired synchronism to the desired sequence, the presence of interference is a major impairment. It has been argued that the performance of the ... View full abstract»

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  • Channel information assisted reuse partitioning-a distributed dynamic channel assignment algorithm based on reuse partitioning

    Publication Year: 1994, Page(s):536 - 540
    Cited by:  Papers (1)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    A new practical algorithm is proposed for dynamic channel assignment (DCA) for microcellular systems. The algorithm, called “channel information assisted reuse partitioning (CIRP),” employs information on assigned channel number versus signal level measured at each base station. The information is utilized to assign a new channel, and is updated in each assignment process in a distribu... View full abstract»

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  • Spectrum sharing feasibility for CDMA PCS

    Publication Year: 1994, Page(s):267 - 271
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    To investigate the application of spread spectrum Code Division Multiple Access (CDMA) technology. To the future personal communications services (PCS), a comprehensive study of CDMA PCS in the 1.8 GHz band in various radio environments has been conducted by Telesis Technologies Laboratory (TTL) in cooperation with Qualcomm Inc. in San Diego. We present the results of TTL's study on spectrum shari... View full abstract»

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  • Effects of beam tilting on bit-rate selection in mobile multipath channel

    Publication Year: 1994, Page(s):225 - 229
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    In this paper, effects of beam tilting on decreasing multipath distortion is theoretically analyzed by using multipath propagation models. It is shown that the system bit-rate can be selected over a wider range with the introduction of beam tilting, if the potential reflection points are not quite close to the base station View full abstract»

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  • A survey of number mobility techniques for PCS

    Publication Year: 1994, Page(s):340 - 344
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    One feature of PCS is that a user can make and receive calls at any locations using the same phone number. This is number mobility. In order to provide number mobility, the network has to be able to locate the called user and then route the call. The process involves updating network's knowledge about user's current location and mapping of the PCS number received from the calling user to the calle... View full abstract»

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  • Integration of wireless technologies into the access network

    Publication Year: 1994, Page(s):596 - 600
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Most telcos are in the process of deploying fiber technologies in the access, and are considering evolving their network to broadband and to wireless services to the end user. The paper reviews access technology trends with the positioning of 2 GHz wireless, will discuss hybrid fiber/coax (HFC), a broadband architecture that is receiving a lot of attention presently, and will provide views on how ... View full abstract»

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  • Analytical methodology for F-TDMA and CDMA cellular systems performance evaluation

    Publication Year: 1994, Page(s):31 - 36
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    A fast and exact methodology to analytically evaluate the performance of cellular mobile radio systems is proposed. Micro and picocellular applications can be investigated. The performance of cellular mobile communication systems can be assessed by considering different cell structures, traffic distributions, F-TDMA and/or CDMA protocols in the presence of interference, multipath fading and therma... View full abstract»

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  • Wireless operation in the unlicensed PCS band

    Publication Year: 1994, Page(s):586 - 590
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    A portion of the emerging technologies band has recently been made available for unlicensed personal communications services. This paper reviews the new physical and operational rules for this unlicensed band. Both “isochronous” (voice) type services and “asynchronous” (data) services are accommodated in the band. Differing rules of access and operation apply to each servic... View full abstract»

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  • Connection-less packet data transmission in the signalling network infrastructure

    Publication Year: 1994, Page(s):511 - 515
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    Most of the current cellular networks provide effective data and speech services using circuit switched technology. However, the utilisation of transmission resources in circuit switching is unoptimal. For this reason the study of the packet radio media access control has been continuing for many years. Most of the studies limit their coverage to the air interface. The network side of the transmis... View full abstract»

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  • Epoch-making `Mobile Transit Network Traffic Monitoring System'

    Publication Year: 1994, Page(s):471 - 474
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    The authors began operating the Mobile Communication Integrated Operation System (MIGS) in 1992; this is an operation system capable of monitoring and controlling the status of various network facilities which constitute the mobile communication network and monitoring the status of services being provided on the network. In the present paper the authors present a new system, the “Mobile Tran... View full abstract»

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  • Power control in CDMA systems: performance evaluation and system design implications

    Publication Year: 1994, Page(s):73 - 77
    Cited by:  Papers (2)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    It is well known that a tight power control is required in CDMA mobile systems to avoid the `near-far' effect. In this paper, the performance of a closed loop power control (CLPC) system is evaluated by simulation in realistic operating environments. The residual signal-to-noise ratio fluctuation at the base station receiver is reported, not only in terms of standard deviation, but also in terms o... View full abstract»

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  • Evaluation of channel allocation with distributed control scheme for street microcellular systems

    Publication Year: 1994, Page(s):541 - 547
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    Distributed control is indispensable to any personal communication service. However, distributed control makes it difficult to obtain the required frequency bandwidth considering the offered traffic and interference because there is no definite relationship between the base stations and the channels that they use. This paper proposes the virtual frequency reuse pattern, namely a virtual cluster si... View full abstract»

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  • Distributed communication control architecture for personal communication service

    Publication Year: 1994, Page(s):272 - 275
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    We propose a new network architecture for personal communication services that provides transparent connectivity to different physical networks and user service customization. User information in this network is managed independently by distributed personal agents (PAs) which are identified by their user's personal ID. PAs interact with each other to establish the best communication paths between ... View full abstract»

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  • Base station polarization-sensitive adaptive antenna for mobile radio

    Publication Year: 1994, Page(s):230 - 235
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    An attractive alternative to combat desired-signal fading and suppress co-channel interference in a mobile radio environment is to use a base station adaptive antenna with polarization-sensitive elements. This paper describes the design of a four-crossed-dipole adaptive array in which polarization discrimination is used to separate the desired signal from both directional and non-directional wave ... View full abstract»

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  • Evaluation studies of DDB architecture with hierarchical structure

    Publication Year: 1994, Page(s):345 - 349
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    In this paper we analyse the performance of a distributed database (DDB) architecture for universal mobile telecommunication systems (UMTS), in the presence of location updating and interrogation mobility procedures. To that end, two data locating strategies have been considered; the R and the V strategies which determine the path to be followed by a query originated by a location updating or by a... View full abstract»

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  • Wireless data in a dissimilar multiple network environment

    Publication Year: 1994
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (24 KB)

    Summary form only given. Wireless data networks are unique in that there are three key aspects to a complete solution: the network, the radio modem and the application. As wireless data networks emerged, the focus was on architecting the network and designing small, power efficient modems. Little effort was focused on the connectivity of the network (and modem) to higher operating systems and appl... View full abstract»

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