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1994 IEEE GLOBECOM. Communications: The Global Bridge

Nov. 28 1994-Dec. 2 1994

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  • 1994 IEEE GLOBECOM Communications: The Global Bridge

    Publication Year: 1994
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  • Linearization of power amplifiers modelling and simulations

    Publication Year: 1994, Page(s):1456 - 1461 vol.3
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    Due to their good spectral efficiency, linear modulation methods are well suited to digital mobile radio systems. However their envelope fluctuations result, after nonlinear amplification, in out-of-band emissions thus adjacent channel interferences. A solution is to linearize the power amplifier. We present an analog linearization loop based an an improved cartesian feedback method. Its performan... View full abstract»

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  • Conference Author Index

    Publication Year: 1994
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    Freely Available from IEEE
  • Application of shaping to discrete multitone modulation

    Publication Year: 1994, Page(s):1894 - 1898 vol.3
    Cited by:  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The application of shaping to discrete multitone (DMT) modulation is investigated as a means for obtaining additional gain in applications requiring high-performance transceivers. DMT modulation differs from single-carrier modulation in that a number of parallel tones are used for transmission and the constellation sizes and transmit power vary across these tones. Shaping gains ranging from 0.5-1.... View full abstract»

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  • Congestion control in integrated voice-data frame relay networks and the case for embedded coding

    Publication Year: 1994, Page(s):1565 - 1570 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Frame relay (FR) networks will be increasingly used for multiple classes of traffic, particularly for compressed voice and data. The quality of service requirements for these two classes are very different: voice is delay sensitive, data is loss sensitive. The use of low-speed access lines to FR networks requires the use of priority service for voice and this entails a requirement for separate con... View full abstract»

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  • Designing multi-hop optical networks using fixed wavelength transceivers

    Publication Year: 1994, Page(s):1538 - 1543 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    It has been recognized that the wavelength division multiplexing (WDM) scheme is one of the most promising ways to exploit the enormous bandwidth in a single mode optical fiber. We focus on using fixed wavelength transmitters and fixed wavelength receivers (which are considered to be more economically and technically feasible) to construct wavelength and time division multiplexed (WTDM) networks b... View full abstract»

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  • Requirements for mobility support in ATM

    Publication Year: 1994, Page(s):1691 - 1695 vol.3
    Cited by:  Papers (11)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    This paper deals with the integration of future mobile systems in a B-ISDN environment, namely, the transport functions required for the support of terminal mobility. Handover (involving an air interface), rerouting (routing optimisation in the fixed network), macro-diversity and mobile trunk connections are defined and the involved transport functions are mapped to the ATM layer of the B-ISDN pro... View full abstract»

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  • Maximum likelihood detection of differentially encoded PSK signals transmitted over Rayleigh frequency-flat fading channels

    Publication Year: 1994, Page(s):1889 - 1893 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    The problem of maximum likelihood (ML) detection of differentially encoded M-PSK signals on Rayleigh fading channels is investigated. It is shown that the solution to this problem can be easily related to previous results [Vitetta and Taylor, 1994] and leads to the implementation of a receiver structure based on a Viterbi Algorithm. The error rate performance of this receiver is evaluated by means... View full abstract»

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  • New models for random channels

    Publication Year: 1994, Page(s):1915 - 1919 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Two new models of random channels are developed. In one, input signals are expanded in a complete orthonormal basis, but channel outputs are formed of linear combinations of random vectors. In the second model, output signals are expanded in an orthonormal set that is complete over the space of all possible output signals from all channels in the ensemble. Input signals are represented in a frame ... View full abstract»

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  • Design and analysis of a buffer management scheme for multimedia traffic with loss and delay priorities

    Publication Year: 1994, Page(s):1560 - 1564 vol.3
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    Future broadband networks (e.g., BISDN/ATM) will provide transport for a wide range of applications that vary in their quality-of-service (QoS) requirements. Such requirements are measured by the cell loss rate and the end-to-end delay (or delay variation). This paper presents an analysis of a buffer management scheme known as nested threshold cell discarding with multiple buffers. NTCD/MB impleme... View full abstract»

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  • Product development through stepwise testing

    Publication Year: 1994, Page(s):1607 - 1611 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Product development has for a long time been following the traditional waterfall method. This approach was rooted in an old NASA philosophy of serial development. The paper discusses how one company has applied more parallelism, and early testing of system components to ward off late cycle surprises. The technique puts emphasis on the early discovery of system anomalies, through small stepwise ref... View full abstract»

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  • High-speed wavelength encoded multiple-channel optical buses for LAN

    Publication Year: 1994, Page(s):1533 - 1537 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Scalable, high-speed, wavelength encoded multiple-channel optical buses (WEMCOB) employing wavelength division multiplexing (WDM) technologies are proposed to alleviate link speed constraints, wiring complexity and to increase power budget economically for a local area network (LAN). A hierarchical topology is adopted in the network where a dual uni-directional WEMCOB with separate control and dat... View full abstract»

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  • Some implications of “best choice of cell site” in radio cellular systems

    Publication Year: 1994, Page(s):1686 - 1690 vol.3
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    In radio cellular systems, interference mitigation is of prime importance since interference is the factor that by far determines the “capacity” of such systems. Letting each mobile be connected to the most favorable cell site, i.e. the one to which the path loss is the smallest, contributes considerably to the attenuation of interference in the system. This however has some implicatio... View full abstract»

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  • Optimum finite-length equalization for multicarrier transceivers

    Publication Year: 1994, Page(s):1884 - 1888 vol.3
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    A new criterion for partially-equalizing severe-ISI channels to reduce the cyclic prefix overhead of the discrete multitone transceiver (DMT) is introduced. The equalized DMT is shown to recover a significant portion of the performance loss incurred because of the use of a moderate size FFT in the DMT to reduce latency and implementation cost. In particular, equalizers designed using the new crite... View full abstract»

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  • C-PRMA: The centralized packet reservation multiple access for local wireless communications

    Publication Year: 1994, Page(s):1340 - 1345 vol.3
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    Packet switched technology has been demonstrated attractive for use in cellular radio systems with short propagation delay, not only for data but also for voice. In fact, packet voice can efficiently exploit speech on-off activity to improve bandwidth use over TDMA. Such an approach has been first suggested by Goodman, Valenzuela, Gayliard and Ramaamurthi (1982), where packet reservation multiple ... View full abstract»

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  • Compensation of nonlinear distortions for orthogonal multicarrier schemes using predistortion

    Publication Year: 1994, Page(s):1909 - 1914 vol.3
    Cited by:  Papers (26)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    In the Digital Terrestrial Television Broadcasting European project, the orthogonal frequency division multiplexing (OFDM) technique is seen as a good candidate. In this paper, characterization of the effects of a nonlinear channel over the OFDM signal is performed for 16-QAM and 64-QAM signal constellations. As expected, the attained performance is poor when compared to a single carrier scheme. T... View full abstract»

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  • A bandwidth management scheme for handling asynchronous and isochronous traffic in a LAN/MAN environment

    Publication Year: 1994, Page(s):1555 - 1559 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    A metropolitan area network (MAN) based upon the dual queue distributed bus (DQDB) standard [IEEE 802.6] provides a medium access scheme, which offers two service classes. The queue arbitrated (QA) medium access part may be used for packet service, whereas the prearbitrated (PA) medium access part is used to serve semipermanent connections having constant bit rates (n×64 kbit/s). This paper ... View full abstract»

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  • A network control architecture for advanced personal communications

    Publication Year: 1994, Page(s):1707 - 1711 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The next generation network requires extremely high performance and a large-scale database to manage personal mobility and terminal mobility. The paper proposes network control with broadcast signaling in a distributed control environment. First, the problems of a centralized control environment are described. To solve the problems, the paper then proposes a new network control architecture for a ... View full abstract»

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  • Call admission control and resource utilization in ATM networks: a new improvement strategy

    Publication Year: 1994, Page(s):1795 - 1800 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    Congestion and admission control are two of the most widely investigated problems which must be faced in ATM. The FBR (fast buffer reservation), i.e. a virtual circuit acceptance algorithm proposed by Turner (1992), based on the excess probability criterion (EPC), seems to be a complete approach for bandwidth management. It will constitute the starting point of the new admission and congestion con... View full abstract»

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  • A novel automatic frequency control method using discrete wavelet transform

    Publication Year: 1994, Page(s):1632 - 1636 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    This paper proposes a novel automatic frequency control (AFC) method using the discrete wavelet transform (DWT). The DWT is a useful analysis tool for non-stationary signals which uses short windows at high frequencies and long windows at low frequencies. The DWT AFC has its own simple structure and an intelligent characteristic of “observation and control according to frequency error”... View full abstract»

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  • Maximum likelihood decoding and code combining for DS/SSMA slotted ALOHA

    Publication Year: 1994, Page(s):1293 - 1297 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The paper considers the combination of different copies of a packet to improve the performance of a DS/SSMA ALOHA packet radio system. Both DS/SSMA ALOHA with and without FEC are considered. For the case with FEC, maximum likelihood decoding with code combining is used. Code combining allows for the combination of multiple copies of the same packet (which are typically discarded), to obtain a lowe... View full abstract»

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  • Architecture and performance of an indoor wireless access communications system using balanced-DCA

    Publication Year: 1994, Page(s):1659 - 1663 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Balanced dynamic channel assignment (BDCA) for TDMA radio systems can provide attractive characteristics in dense pedestrian wireless access environments such as wireless PBX or Centrex, but BDCA is less attractive in widespread residential and public access environments, because DCA approaches require frame synchronization of radio ports. BDCA systems make interference measurements at both radio ... View full abstract»

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  • Monte-Carlo multipath simulation of ray tracing channel models

    Publication Year: 1994, Page(s):1446 - 1450 vol.3
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    This paper addresses the simulation of multipath propagation on indoor radio channels. In particular, we study extremely high frequencies (60 GHz), where the common WSSUS model suffers from spatial limitations. We introduce a new approach to channel modeling. A statistical channel model is derived from a deterministic ray tracing description of the multipath situation by a tolerance analysis. Furt... View full abstract»

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  • Contention processing schemes for WDM networks with control channels

    Publication Year: 1994, Page(s):1528 - 1532 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    The main objective of this paper is to investigate contention processing schemes that improve the performance of wavelength division multiplexing (WDM) networks with control channels while avoiding electronic bottle-neck. For this purpose, we propose two novel contention processing schemes: local collision blocking (LCB) and local collision blocking-contention resolution (LCB-CR) schemes. We also ... View full abstract»

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  • Optimum modulation and diversity for DS-SS communication over a pulse-burst jammed, Rayleigh fading channels

    Publication Year: 1994, Page(s):1727 - 1737, 1737a-c vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Results of optimum modulation and coding for MPSK and MDPSK signals transmitted over faded and jammed channels are presented. Exact expressions of the probability of error for the M-ary modulations on Rayleigh channels subject to pulse-burst jamming are used. The analysis of optimum diversity (repetition code) is carried out by a Chernoff bound approximation. Simple expressions are derived to dete... View full abstract»

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