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IEE Proceedings - Communications

Issue 6 • Date Dec. 2000

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Displaying Results 1 - 14 of 14
  • Performance of DS code acquisition in static and fading multipath channels

    Publication Year: 2000, Page(s):355 - 360
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (654 KB)

    The author introduces analytical results of a direct sequence (DS) spread spectrum code acquisition, which is performed using a matched filter in a multipath channel. The performance measure is the mean acquisition time, TMA. Equations for the mean acquisition times as a function of the number of propagation paths and the number of uncertainty cells are derived for a static channel. A n... View full abstract»

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  • Improved lower bounds on the symbol error probability for ISI channels

    Publication Year: 2000, Page(s):351 - 354
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (360 KB)

    A lower bound on the symbol error probability obtained with maximum likelihood sequence detection on the intersymbol interference channel is derived. It is recognised that the bound can be substantially improved by considering every possible transmitted sequence and not only the ones generating the well-known dmin2. Also, a method is devised which finds the additive component... View full abstract»

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  • Anonymous public-key certificates for anonymous and fair document exchange

    Publication Year: 2000, Page(s):345 - 350
    Cited by:  Papers (4)  |  Patents (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (640 KB)

    Two protocols are presented for the issuing and identity tracing of anonymous public-key certificates, used by different parties to engage in an anonymous and fair document exchange without revealing their real identities while still being held accountable for their activities. The certificate issuing protocol allows a party to apply to certificate authorities for anonymous public-key certificates... View full abstract»

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  • Author Index

    Publication Year: 2000, Page(s): 381
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (40 KB)

    First Page of the Article
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  • Acyclic Tanner graphs and maximum-likelihood decoding of linear block codes

    Publication Year: 2000, Page(s):322 - 332
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1076 KB)

    The maximum-likelihood decoding of linear block codes by Wagner rule decoding is discussed. In this approach, the Wagner rule decoding, which has been primarily applied to single parity check codes, is employed on acyclic Tanner graphs. Accordingly, a coset decoding equipped with Wagner rule decoding is applied to the decoding of a code C having a Tanner graph with cycles. A subcode C1 ... View full abstract»

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  • High-speed decoding of extended Golay code

    Publication Year: 2000, Page(s):333 - 336
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (320 KB)

    A simple high-speed decoding algorithm for the [24,12,8] extended Golay code suitable for implementation in combinational circuits is described. The proposed decoding algorithm corrects all patterns of three or fewer errors and detects quadruple errors using the Turyn construction of the extended Golay code. It is proved that the [24,12,8] Golay code can correct all patterns of three or fewer rand... View full abstract»

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  • Peak-to-average ratio (PAR) reduction by Walsh code selection for IS-95 and CDMA2000 systems

    Publication Year: 2000, Page(s):361 - 364
    Cited by:  Papers (2)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (320 KB)

    Peak-to-average ratio (PAR) of a signal is an important parameter for a linear amplifier because it determines the backoff factor needed to be applied to the amplifier in order to avoid clipping and hence spectral regrowth. The author analyses and compares the PAR of the downlink signal for the IS-95 and the CDMA2000 single carrier systems. It is found that PAR of the signal depends on the Walsh c... View full abstract»

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  • Subject Index

    Publication Year: 2000, Page(s):382 - 383
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (220 KB)

    First Page of the Article
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  • Congestion reduction in transmission of video over ABR networks

    Publication Year: 2000, Page(s):305 - 310
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (836 KB)

    In the transmission of bursty traffic such as video and data, a network with a fixed capacity may have some unused bandwidth. The available bit rate (ABR) scheme in ATM networks can make use of this spare channel capacity as a lower priority service. ABR has been developed initially for delay-tolerant services such as data. The authors demonstrate how, with the help of a video transcoder, delay-se... View full abstract»

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  • Downlink transmit diversity schemes for CDMA networks

    Publication Year: 2000, Page(s):371 - 380
    Cited by:  Papers (5)  |  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1036 KB)

    Transmit diversity schemes that have been proposed for the downlink in CDMA networks are discussed. They provide diversity gain against Rayleigh fading at the mobile which can significantly improve performance. Theoretical error formulas for convolutional codes are shown to be useful in optimising the performance of some of these techniques. Performance results from a number of simulation studies ... View full abstract»

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  • Long-range dependence and self-similarity in World Wide Web proxy cache references

    Publication Year: 2000, Page(s):317 - 321
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (420 KB)

    The existence of long-range dependence and self-similarity properties within World Wide Web proxy cache references is reported. Fractional ARIMA processes are used to generate long-range dependent cache hit/miss sequences in order to model the growth in cache occupancy. This model was compared to a model using independent cache hit/miss sequences and it was found that the results predicted by thes... View full abstract»

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  • Improved union bounds on turbo codes performance

    Publication Year: 2000, Page(s):337 - 344
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (664 KB)

    An improved union bound on the performance of turbo codes is evaluated, extending the preliminary results presented by Viterbi and Viterbi (1998) in conjunction with the input-binary AWGN channel. Since, in an increasing number of important applications, the AWGN channel provides an entirely inappropriate model of the propagation environment, the analytical expression of the previously derived imp... View full abstract»

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  • Performance of multi-code CDMA in a multipath fading channel

    Publication Year: 2000, Page(s):365 - 370
    Cited by:  Papers (8)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (516 KB)

    The authors provide a general investigation on the performance of multi-code code division multiple access (MC-CDMA) over Rayleigh fading plus additive white Gaussian noise (AWGN) channels. In MC-CDMA, high speed data sources are serial-to-parallel converted to low speed streams, which are further spread by Hadamard-Walsh orthogonal sequences and random codes. Numerical results show that, in a mul... View full abstract»

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  • Multiple access control protocol for integrated isochronous and bursty data services

    Publication Year: 2000, Page(s):311 - 316
    Cited by:  Papers (1)  |  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (524 KB)

    A novel multiple access control (MAC) protocol (CHARISMA) is introduced for integrated wireless voice and data services on the uplink channel in a cellular wireless network. The CHARISMA protocol is motivated by the fact that previous protocols ignore the burst errors of the channel due to fading and shadowing. As such, the physical layer of the proposed system is a variable-rate adaptive channel ... View full abstract»

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