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Personal, Indoor and Mobile Radio Communications, 1996. PIMRC'96., Seventh IEEE International Symposium on

18-18 Oct. 1996

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  • The Seventh IEEE International Symposium on Personal, Indoor and Mobile Radio Communications PIMRC'96

    Publication Year: 1996, Page(s):0_3 - xxi
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    Freely Available from IEEE
  • Combined coding and quadratic detection for DS/CDMA systems operating in Rayleigh fading channels

    Publication Year: 1996, Page(s):1120 - 1124 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    We present the true union bound of a DS/CDMA system that employs convolutional coding and a quadratic detector. In our study, the total bandwidth expansion factor caused by coding and spreading is fixed and the channel is assumed to exhibit Rayleigh flat fading. The objective is to assess the performance of various quadratic detectors as a function of the spreading factor and the fade rate. Specif... View full abstract»

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  • On the management of end-to-end multimedia and multibearer connections in a personal communications system

    Publication Year: 1996, Page(s):1178 - 1182 vol.3
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (749 KB)

    Wireless-PCS systems, through the introduction of new conception control functions, aim to respond to the user expectation of high performing services and the need for flexibility in the management of disparate categories of multimedia and multi-requirement applications supported by the networks. This paper contributes to the ongoing research work in this scenario by describing some proposals for ... View full abstract»

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  • Author index

    Publication Year: 1996, Page(s):0_10 - 0_13
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    Freely Available from IEEE
  • Statistical modelling of time variant processes for interference analysis in mobile radio network planning

    Publication Year: 1996, Page(s):823 - 827 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    In this paper different methods for the statistical modelling of time variant processes for interference analysis in radio network planning tools are presented. These methods will be pointed out exemplarily for two network features, frequency hopping (FH) and base station power control (BTS power control). The methods are presently being implemented in a radio network planning tool used for planni... View full abstract»

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  • Efficient end-to-end authentication protocols for mobile networks

    Publication Year: 1996, Page(s):1252 - 1256 vol.3
    Cited by:  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    For conventional authentication protocols, distribution of session keys and maintenance of large databases are serious problems especially for large-scale wireless networks. ID-based authentication protocol eliminates the problem while it contributes the heavy computation load. We propose a hybrid end-to-end authentication and key agreement (AKA) protocol which provides authentication and key exch... View full abstract»

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  • The RSSE receiver with the channel estimator using the path history

    Publication Year: 1996, Page(s):818 - 822 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    For mobile communication systems, the RSSE (reduced state sequence estimation) receiver must be made adaptive to learn and to track the channel parameters. This is achieved by the adaptive channel estimator. But the channel estimator using the tentative decisions has error propagation because of incorrect decisions. This paper presents a new channel estimator using the path history in the Viterbi ... View full abstract»

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  • Performance evaluation of the least conflict sharable spreading code assignment algorithm

    Publication Year: 1996, Page(s):1207 - 1211 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Multihop CDMA wireless networks with a large number of stations would require a large number of spreading codes, even with code reuse beyond the interference range. In this paper, we propose the least conflict sharable code assignment algorithm to reduce the number of codes needed and at the same time avoid code collisions as far as possible. We also introduce the mean conflictness of a network as... View full abstract»

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  • On the security of Park et al.'s key distribution protocol for digital mobile communications

    Publication Year: 1996, Page(s):1248 - 1251 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    Park et al. (see Proceedings of EuroCrypto '93, p.T131, 1993) previously proposed an efficient key distribution scheme for digital mobile communications. Two attacks are given in this paper to show that their scheme is not secure enough for session key distributions. A modified protocol is proposed to avoid these weaknesses View full abstract»

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  • Enhancement of VSELP speech coding for North American digital cellular

    Publication Year: 1996, Page(s):1005 - 1009 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    We consider enhancement of the North American IS-54/136 vector sum excited linear prediction (VSELP) speech coding in the sense of reducing complexity or improving speech quality. For complexity reduction, we find a few techniques which can reduce, respectively, the pitch and excitation search complexities by approximately 40-50% at a moderate SSNR loss of roughly 0.5 dB. For quality improvement, ... View full abstract»

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  • Wireless connection management over ATM networks

    Publication Year: 1996, Page(s):888 - 892 vol.3
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    An architecture for integrating the wireless services into the network management architecture of future ATM networks is presented. Such integrated communication networks are motivated by an anticipated demand for wireless extension to the future ATM network. First, we briefly propose the AWN Binding Reference Model (ABRM) which can support the mobilities of wireless terminals over ATM networks. H... View full abstract»

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  • Performance evaluation of a cellular CDMA system over frequency-selective fading channels

    Publication Year: 1996, Page(s):1188 - 1191 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    An effect of multipath on the performance of cellular code division multiple access (CDMA) is investigated. The bit error rate (BER) for both the forward link and reverse link over Rayleigh frequency-selective fading channels are derived. The coherent BPSK modulation with asynchronous direct-sequence (DS) spreading is assumed. The analysis results show the performance degradation of cellular CDMA ... View full abstract»

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  • Digital frequency synthesizer/modulator for continuous phase modulations with slow frequency hopping

    Publication Year: 1996, Page(s):1039 - 1043 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    This paper gives a description of a modulator for burst-by-burst carrier frequency hopping in TDMA systems. The architecture consists of a digital frequency synthesizer/modulator for a broad class of continuous phase modulations (CPMs) and a fast frequency settling RF synthesizer consisting of one phase-locked-loop (PLL). The performance of the digital frequency synthesizer/CPM modulator has been ... View full abstract»

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  • A simple scheme to improve the performance of your cellular system

    Publication Year: 1996, Page(s):813 - 817 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    The stochastic nature of wireless communication that manifests itself by the fading processes leads the designers of wireless networks to over-engineer their designs. This random behavior can, however, be reduced by diversity methods. For example, Rayleigh fading can be mitigated by microdiversity and the effects of shadow fading can be reduced by macrodiversity techniques. In this paper, we advoc... View full abstract»

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  • Packetized wireless access for data traffic in frequency reuse environments

    Publication Year: 1996, Page(s):1150 - 1154 vol.3
    Cited by:  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    We have proposed and studied the performance of a measurement based MAC protocol for wireless packet data communications in the presence of co-channel interference. A fuzzy logic based algorithm is used to control the permission probability of each TDMA slot based on the interference and traffic conditions. This algorithm provides an adaptive access mechanism to achieve a balance between traffic t... View full abstract»

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  • Adaptive narrowband interference cancellation in overlaid CDMA systems using prior knowledge

    Publication Year: 1996, Page(s):838 - 842 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    Narrowband interference cancellation techniques described in the literature often overlook the possibility of using prior information known to the receiver in a commercial radio environment to improve their performance. This paper examines an adaptive receiver which exploits knowledge about the narrowband interference which is readily available in commercial CDMA systems, namely its frequency and ... View full abstract»

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  • Downlink channel assignment algorithms for packet-based wireless TDMA/FDMA networks

    Publication Year: 1996, Page(s):1202 - 1206 vol.3
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    Uplink/downlink independent radio resource management is one solution for emerging multimedia wireless networks. This paper presents six downlink channel assignment algorithms for packet-based TDMA/FDMA systems. The goal is to minimize the channel setup delay while attaining high transmission quality. Computer simulations are used to evaluate system performance in terms of dropped packet ratio and... View full abstract»

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  • On the design of secure group-oriented communication channels in Internet environments

    Publication Year: 1996, Page(s):1243 - 1247 vol.3
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    This paper presents efficient protocols for establishing secure group-oriented communication channels in Internet environments based on a geometric method. Since the data encryption/decryption requires a common secret session key between two communicating parties, finding an efficient way to distribute the group-oriented secret session key in Internet environments has become a nontrivial task. We ... View full abstract»

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  • Inbuilding prediction [radio propagation]

    Publication Year: 1996, Page(s):771 - 775 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    Potential implementation of wireless radio local area networks and personal communication services inside buildings require a thorough understanding of signal propagation within a building. In this paper an inbuilding prediction tool is presented. It uses a more simplified method than the ray tracing method. The prediction in this tool focuses on a single floor of a building applicable to differen... View full abstract»

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  • Performance and error sensitivity comparison of low and high delay CELP codecs between 8 and 4 kbits/s

    Publication Year: 1996, Page(s):1000 - 1004 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    In this paper we study the performance and error sensitivities of several CELP based codecs operating between 8 and 4 kbits/s. Both forward and backward adaption techniques are used for the short and the long term predictors, and both trained and algebraic excitation codebooks are used. Three codecs which employ backward adaption of their short term predictors and operate with frame-lengths of 3 m... View full abstract»

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  • An LMS-based decision feedback equalizer for digital cellular radio

    Publication Year: 1996, Page(s):883 - 887 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    In a TDMA mobile communication system, the equalizer is a common device to compensate the intersymbol interference caused by the multipath effect. In this paper, we consider the decision feedback equalizer (DFE) for application to the North American IS-54 systems. Due to the fast fading characteristic of channels, most conventional DFEs use the recursive least square (RLS) algorithm. However, it i... View full abstract»

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  • On the traffic estimation and engineering of GSM network

    Publication Year: 1996, Page(s):1183 - 1187 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    We propose a detailed analysis and estimation of SS7 signaling traffic performance on GSM databases in Taiwan. With the network engineering and configuration, a fluid flow mobility model is employed to investigate the performance of signaling traffic between databases such as home location registers (HLRs), visitor location registers (VLRs), and equipment identification register (EIR). We also pro... View full abstract»

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  • A new network architecture for wireless communications

    Publication Year: 1996, Page(s):933 - 937 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Current cellular systems are based on the concept of a cell. Although the cell allows channel reuse, it has also become a metaphor for channel confinement and leads to the thorny problem of handoff and call dropping. The problem will get much worse as cellular services move toward high-speed and multirate. This paper presents a new wireless network architecture: called MAWCC for its main character... View full abstract»

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  • Block shuffling on top of error concealment for wireless image transmissions

    Publication Year: 1996, Page(s):977 - 981 vol.3
    Cited by:  Papers (4)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1048 KB)

    Nowadays the image and video compression standards employ variable length coding (VLC). One disadvantage of using VLC is that whenever an error occurs, it propagates until the next resynchronization can be achieved. Error propagation under fading conditions makes severe destruction in a bundle of blocks within an image. In such situations, error concealment may not perform well due to the missing ... View full abstract»

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  • On code tracking in direct sequence spread spectrum systems using adaptive filtering techniques

    Publication Year: 1996, Page(s):858 - 862 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    This paper investigates the tracking of DS/SS signals based on an adaptive filtering technique. It is shown that a previously proposed system for code acquisition is also capable of code tracking and, by performing both acquisition and tracking with the same circuitry, significant simplification in the overall DS/SS receiver is gained. Analytical results show that the proposed scheme has a good tr... View full abstract»

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