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Global Telecommunications Conference, 1995. GLOBECOM '95., IEEE

14-16 Nov. 1995

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  • Globecom '95 - The Global Telecommunications Conference

    Publication Year: 1995
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  • A lower performance bound for phase estimation over slowly-fading Ricean channels

    Publication Year: 1995, Page(s):2012 - 2016 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1241 KB)

    In this paper we present a fundamental lower bound to the mean-square error of estimators of the phase of a sine wave passed through a Ricean fading channel. As particular cases, expressions of the bound inherent to Gaussian and Rayleigh channels are also provided. The bound is derived from the performance analysis of the Bayes minimum mean-square error phase estimator. The salient features of thi... View full abstract»

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  • CONFERENCE AUTHOR INDEX

    Publication Year: 1995
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    Freely Available from IEEE
  • Precise detection of the on-board IF-switch timing for SS-TDMA systems

    Publication Year: 1995, Page(s):1899 - 1903 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    The authors address a procedure for detecting the timing of the on-board IF-band switch which provides timing reference to multibeam SS-TDMA satellite communication systems. We propose a new procedure using a pattern matching technique to detect the timing of the trailing edge of the sync window against the timing of the transmitted reference burst. Moreover, we evaluate the performance of this pr... View full abstract»

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  • A new digital correlator for bandlimited direct sequence spread spectrum signals

    Publication Year: 1995, Page(s):1894 - 1898 vol.3
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    A new digital correlator for the reception of bandlimited direct sequence (DS) spread spectrum (SS) signals is described. This correlator could be used in CDMA applications. The correlator is simple in its implementation, using a sign-controlled switch instead of the multiplier and a delta-sigma converter with up/down counter as an integrator. This A/D is simple in its realization, and does not re... View full abstract»

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  • Performance of pulse-position modulation with trellis-coded modulation on non-directed indoor infrared channels

    Publication Year: 1995, Page(s):1830 - 1834 vol.3
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    We examine the performance of high-speed non-directed infrared links using pulse-position modulation (PPM) with trellis-coded modulation (TCM) to mitigate the effects of multipath-induced intersymbol interference (ISI) on such links. Using the measured characteristics of multipath indoor infrared channels, we calculate BER curves and ISI power penalties for maximum-likelihood sequence detection of... View full abstract»

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  • Parallel acquisition scheme with reference filtering for a DS/SSMA packet radio system

    Publication Year: 1995, Page(s):1889 - 1893 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    This paper evaluated the performance of a non-coherent parallel matched-filter acquisition scheme with a reference filter for a direct-sequence/spread-spectrum multiple access (DS/SSMA) packet radio system. This acquisition scheme employs a reference filter to estimate the variance of the interference at the output of the detecting matched filter. Packet throughput for the parallel MF-RF scheme is... View full abstract»

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  • Performance of binary CPM schemes in frequency selective fading channels with pilot symbol assisted detection

    Publication Year: 1995, Page(s):2027 - 2032 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    We present a coherent detector for binary continuous phase modulation (CPM) schemes operating in a frequency selective fading environment. The technique uses embedded pilot symbols for the purpose of channel impulse response estimation. Unlike pilot symbol assisted linear modulation, the pilot symbols in our CPM system are divided into two groups. The first group of pilot symbols is data dependent... View full abstract»

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  • A generic software platform for local ATM networking

    Publication Year: 1995, Page(s):1967 - 1971 vol.3
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    We define the requirements of a generic software platform for signaling and network management in a local ATM network. Based on these requirements, we compare some implementations, namely, VINCE, Q.port and XUNET, and conclude that none of these implementations provide a complete separation of the switching hardware and the signalling software. We select VINCE as our platform, since it is highly m... View full abstract»

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  • Optimized compensation transaction for mobile telecommunication systems

    Publication Year: 1995, Page(s):1573 - 1579 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    Mobile telecommunications has a real-time database system, named home location register (HLR). The HLR system manages location information of subscribers for mobile telecommunications in a distributed manner. Whenever a mobile subscriber crosses over location areas, update transactions in HLR systems take a unilateral commit action to support fast processing. However, the unilateral commitment can... View full abstract»

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  • An efficient 4-level coded-CPM modem for a wireless local area network-coded-QPTM

    Publication Year: 1995, Page(s):1825 - 1829 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A new modulation scheme, named coded-QPTM (quatenary phase transition modulation) is proposed for a local-area wireless network (wireless LAN) application. Coded-QPTM is essentially a continuous phase modulation scheme and encoding is executed under the principle of block coding to enlarge the modulated signal distance for Viterbi sequence estimation. A simple (10,9) code can improve the BER perfo... View full abstract»

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  • A feasible architecture for high-speed synchronous CDMA distribution network using optical processing

    Publication Year: 1995, Page(s):1794 - 1798 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    We propose a feasible architecture to implement tunable all-optical synchronous CDMA networks. Such a network is simply based on single rapidly tunable optical delay-lines and requires only a small number of electro-optic switches. Fast coding and decoding algorithms for synchronous prime-sequence codes are described. By using the proposed technique, all-optical synchronous CDMA networks can be co... View full abstract»

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  • A modified time-shared code tracking loop for frequency hopping systems

    Publication Year: 1995, Page(s):1884 - 1888 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    A modified time-shared code tracking loop (MTSL) for frequency-hopped signals is presented. The tracking performance of the MTSL in the presence of white Gaussian noise is analyzed. An analytical expression for the code tracking jitter performance is derived and plotted, and the results compared to those obtained for the traditional time-shared loop (TTSL) and the traditional full-time loop (TFTL)... View full abstract»

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  • Pareto process as a model of self-similar packet traffic

    Publication Year: 1995, Page(s):2232 - 2236 vol.3
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    In the past few years packet traffic from various sources-Ethernet, ISDN, CCSN and VBR video-has been shown to exhibit self-similarity, and related properties of long range correlation, slowly decaying variances and fractal dimensions. This discovery has motivated research into unconventional traffic models such as fractional Brownian motion, fractional ARIMA and chaotic maps. These models explain... View full abstract»

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  • Estimation of SS7 traffic in UMTS network

    Publication Year: 1995, Page(s):2302 - 2307 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    In this paper, we present a general model for the prediction of signaling traffic in a network where the terminal mobility shares the signaling infrastructure of fixed services. The model uses state transitions to estimate calling patterns and usage of services. In addition, methods of mapping state transitions to physical movements are presented. We examine a number of dynamic phenomena observed ... View full abstract»

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  • Bit error rate performance of antenna diversity systems with channel correlation

    Publication Year: 1995, Page(s):2022 - 2026 vol.3
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Wireless communication channels such as mobile radio or indoor wireless channels suffer from a number of impairments including signal fading which causes severe performance degradation. The adverse effects of fading can be mitigated by employing space (spaced antennas) diversity techniques at the mobile and/or at the base station. This paper derives the bit-error-rate equations for BPSK using maxi... View full abstract»

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  • Adaptive ARQ/FEC for multitone transmission in wireless networks

    Publication Year: 1995, Page(s):2278 - 2283 vol.3
    Cited by:  Papers (6)  |  Patents (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    This paper describes an automatic repeat request and forward error correction (ARQ/FEC) procedure for multitone data transmission. Multitone data transmission is a candidate for broadband wireless applications. The technique makes use of cyclic redundancy checking (CRC) in both time and frequency. When a block of data is found to be in error, the error is located and corrected by iterative partial... View full abstract»

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  • Service analysis and design with a graphical domain-enhanced tool

    Publication Year: 1995, Page(s):1962 - 1966 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    Today's telecommunications services are designed as distributed processes. DESPOT, a graphical tool of GTE's intelligent network (IN) Testbed, facilitates the analysis and design of distributed processes by making it easy to create and manipulate component interaction diagrams (CIDs) depicting interactions among process components. DESPOT generates World Wide Web “pages” from domain-sp... View full abstract»

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  • Adaptive satellite channel assignment scheme in high-speed ATM data communications

    Publication Year: 1995, Page(s):1652 - 1656 vol.3
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    Applying the satellite TDMA system to high-speed data communication services has a number of advantages. However, there are some problems in providing these services through fixed satellite TDMA channel capacities because the traffic of the high-speed data communications is very bursty and varied. In order to solve these problems, we have studied a satellite channel assignment scheme for high-spee... View full abstract»

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  • Modelling of stimulated Brillouin scattering effects on optical fibre supported millimeter-wave systems

    Publication Year: 1995, Page(s):1982 - 1986 vol.3
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Stimulated Brillouin scattering may have serious effects on optical fibre supported millimeter-wave systems. The interactions of SBS with source laser phase noise, fibre dispersion, differential delay between the two carriers and the modulation of the optical carrier are investigated using a modelling and simulation platform developed for this purpose. Illustrative results are presented and effect... View full abstract»

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  • Subarrier multiplexing based signaling and access control in optical FDM networks

    Publication Year: 1995, Page(s):1996 - 2002 vol.3
    Cited by:  Papers (1)  |  Patents (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    A framework for subcarrier-multiplexing-based signaling and access control in optical FDM networks is presented. Fundamental node functions in optical FDM networks including channel selection, cross-connect, and add/drop are proposed. Furthermore, a subcarrier-controlled optical add/drop multiplexer is experimentally demonstrated. It is composed of an arrayed-waveguide-grating (AWG) and optical sw... View full abstract»

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  • A framework for distributed Internet service

    Publication Year: 1995, Page(s):1568 - 1572 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    This paper documents the framework for a hypermedia information service for the Internet called the Petri net object information service (POIS). This Internet service takes into consideration such issues as user interactive concurrent multimedia. It includes a data model, MHPN, for hypermedia applications, a network protocol for client and server communication, and a server and client software arc... View full abstract»

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  • Geometrically uniform trellis codes for the Rayleigh-fading channel

    Publication Year: 1995, Page(s):1820 - 1824 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    We have applied the theory of geometrically uniform (GU) codes to search for good PSK trellis codes for the Rayleigh flat fading channel. It is now well established that the code parameter to be optimised for the Rayleigh fading channel is the diversity (Hamming distance) of the code. We have derived an upper bound on the diversity of multiple symbol per branch trellis codes in terms of the number... View full abstract»

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  • Improvement in the quality of speech received at suppressed carrier SSB

    Publication Year: 1995, Page(s):1615 - 1618 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    A receiver should tune to the carrier frequency accurately at suppressed carrier SSB (SCSSB). Manual tuning, however, is very difficult due to the lack of the carrier signal. If fine tuning fails at reception, the quality of received speech is degraded owing to the shift of speech spectrum. This article proposes a method to improve the quality of speech degraded at SCSSB. Received speech is transf... View full abstract»

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  • Multi-rate detection for the IS-95 CDMA forward traffic channels

    Publication Year: 1995, Page(s):1789 - 1793 vol.3
    Cited by:  Papers (12)  |  Patents (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    The IS-95 direct sequence code division multiple access (DS-CDMA) system has become a US digital cellular standard. In the forward traffic channels (from the base station to the mobiles), the speech encoder rate can vary, depending on the speech activity in the transmitter. At the receiver, the decoder does not know which one of the speech encoder rate the transmitter used. This paper focuses on t... View full abstract»

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