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IEEE Communications Letters

Issue 7 • July 2000

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Displaying Results 1 - 12 of 12
  • Comments on the peak factor of sampled and continuous signals

    Publication Year: 2000, Page(s):213 - 214
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (39 KB)

    Peak factors of the continuous signal and a corresponding sampled sequence are considered. It is shown, by means of an illustrative example, that in spite of the fact that the peak factor of the sampled signal is bounded, the peak factor of the continuous signal may be arbitrarily large. View full abstract»

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  • Greedy-based dynamic channel assignment strategy for cellular mobile networks

    Publication Year: 2000, Page(s):215 - 217
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (62 KB)

    This letter proposes a greedy-based dynamic channel assignment (GDCA) strategy in cellular mobile communication networks. Its main feature is that it dynamically allocates the channels based on the greedy method. Instead of the regular hexagon cell shape considered by previous strategies such as BCO, BDCL, various CP-DCA, the new strategy can be applied to any irregular cell shape. In addition, it... View full abstract»

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  • Dynamic TDD and fixed cellular networks

    Publication Year: 2000, Page(s):218 - 220
    Cited by:  Papers (32)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (64 KB)

    There are many benefits in using time division duplex (TDD) instead of frequency division duplex (FDD) schemes in fixed wireless cellular systems. To name a few; channel reciprocity for the single carrier frequency used on both up and downlinks will allow easy access to channel state information, reduced complexity of RF design, much higher flexibility in handling dynamic traffic, simpler frequenc... View full abstract»

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  • Improved space-time codes using serial concatenation

    Publication Year: 2000, Page(s):221 - 223
    Cited by:  Papers (52)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (62 KB)

    In this letter, a new family of space-time codes is proposed. These codes employ a serially concatenated coding scheme with a standard space-time code as the outer code and a very simple rate-1 recursive code as the inner code. Adding this simple rate-1 recursive inner code does not decrease the bit rate and introduces only negligible complexity increase to the transmitter when compared to cases w... View full abstract»

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  • Transmission of information by biorthogonal functions

    Publication Year: 2000, Page(s):224 - 225
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (50 KB)

    As a generalization of transmission of information by orthogonal functions, we present a principle for transmission of information by biorthogonal functions. With this principle, common electrical waveforms such as square wave, triangular wave and trapezoidal wave can also be used as carriers in multiplexing. View full abstract»

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  • On decoding of block codes with peak-power reduction in OFDM systems

    Publication Year: 2000, Page(s):226 - 228
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (76 KB)

    This letter discusses the decoding of a block-coded scheme proposed for orthogonal frequency division multiplexing peak power reduction, employing the ordered statistic decoding algorithm. Performance is evaluated by computer simulations over an additive white Gaussian noise channel and compared with the union bound. It is shown that with respect to optimum decoding, significant computational redu... View full abstract»

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  • Offset invariance in maximum-likelihood decoding for a class of partial response channels

    Publication Year: 2000, Page(s):229 - 230
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (39 KB)

    In this letter we show that for a class of partial response channels with discrete-time pulse response of the form (1-D)P(D) whose output samples are corrupted by independent samples of additive white Gaussian noise with mean m, a maximum likelihood sequence detector designed for the case of m=0 is also the maximum likelihood sequence detector for an arbitrary value of m. The studied class of part... View full abstract»

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  • Cryptanalysis of Nyberg-Rueppel's message recovery scheme

    Publication Year: 2000, Page(s):231 - 232
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (36 KB)

    The standard drafts, P1363 (1996) and ISO 9796-4 (1998), have adopted the discrete-logarithm based on signature equation, S3, which was originally proposed by Nyberg and Rueppel (1994). They also claimed that the signature scheme based on S3 and S5 can resist the known message attack. In this letter, we propose an extended known message attack to show that the message recovery signature scheme bas... View full abstract»

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  • Effects of chip rate on selective RAKE combining

    Publication Year: 2000, Page(s):233 - 235
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (88 KB)

    The focus of this paper is to characterize the performance of a RAKE receiver tracking the L strongest multipath components and to quantify the effects of the chip rate on spread spectrum systems operating in dense multipath frequency-selective fading environments. Analytical expressions for the symbol error probability are derived in terms of the chip rate, multipath spread of the channel and an ... View full abstract»

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  • Deterministic loss ratio quality of service guarantees for high speed networks

    Publication Year: 2000, Page(s):236 - 238
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (59 KB)

    Current research for the provision of deterministic quality of service guarantees in both IP networks and high speed networks involve only bounded delay guarantees, In this letter, loss ratio is considered. We propose constraints on the service function in order to provide not only deterministic bounded loss ratio under a given buffer capacity but also bounded delay. Network operation can be easil... View full abstract»

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  • Operation of WDM networks with different wavelength conversion capabilities

    Publication Year: 2000, Page(s):239 - 241
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (51 KB)

    We study the impact of wavelength conversion capability on wavelength routing WDM networks with fixed shortest-path routing. We propose a method for implementing wavelength routing in a WDM network with partial wavelength conversion capability. Simulation results show that such partial wavelength conversion networks provide a performance in between that of wavelength continuous networks and those ... View full abstract»

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  • On timing offset estimation for OFDM systems

    Publication Year: 2000, Page(s):242 - 244
    Cited by:  Papers (247)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (61 KB)

    Two timing offset estimation methods for orthogonal frequency division multiplexing (OFDM) systems as modifications to Schmidl and Cox's method (see IEEE Trans. Commun., vol.45, p.1613-21, 1997) are presented. The performances of the timing offset estimators in additive white Gaussian noise channel and intersymbol interference channel are compared in terms of estimator variance obtained by simulat... View full abstract»

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IEEE Communications Letters publishes letters on the frontiers of research within the field of interest of the IEEE Communications Society in a timely manner.

 

 

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Editor-in-Chief
Octavia Dobre
Memorial University, Canada