IEEE Communications Letters

Issue 10 • Oct. 1999

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Displaying Results 1 - 7 of 7
  • A differentially coherent delay-locked loop for spread-spectrum tracking receivers

    Publication Year: 1999, Page(s):282 - 284
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (87 KB)

    A novel differentially coherent delay-locked loop (DCDLL) for accurate code tracking is proposed for direct sequence spread-spectrum systems. Due to the use of the differential decoder and exactly one correlator, the proposed scheme avoids the problems of gain imbalance. The tracking error variance is derived by linear analysis. When the proposed DCDLL scheme is applied in ranging with additive wh... View full abstract»

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  • Symbol-based turbo codes

    Publication Year: 1999, Page(s):285 - 287
    Cited by:  Papers (33)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (106 KB)

    We present a new turbo-coding method which parses the input block into n-bit symbols and interleaves on a symbol-by-symbol basis. This is used in conjunction with different modulation techniques to take advantage of tradeoffs between bit error rate performance, code-rate, spectral efficiency, and decoder complexity. The structure of the encoder and decoder of these codes, which We call symbol-base... View full abstract»

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  • New binary sequences with good aperiodic autocorrelations obtained by evolutionary algorithm

    Publication Year: 1999, Page(s):288 - 290
    Cited by:  Papers (22)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (97 KB)

    A new binary sequences for lengths up to 100 with good autocorrelation function properties are presented. The results obtained by an evolutionary algorithm are better than other known results in most cases. View full abstract»

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  • Adaptive channel estimation using cyclic prefix in multicarrier modulation system

    Publication Year: 1999, Page(s):291 - 293
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (85 KB)

    Multicarrier modulation (MCM) is a promising technique for high rate data transmission and the channel estimation is very important for the implementation of MCM. We found that the cyclic prefix, originally used solely to reduce the intersymbol interference (ISI), can be viewed as a source of channel information. Based on this observation, we propose an adaptive channel estimation algorithm using ... View full abstract»

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  • Performance of TCP extensions on noisy high BDP networks

    Publication Year: 1999, Page(s):294 - 296
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (35 KB)

    Experiments on high bandwidth delay product (BDP) networks assist in the design and understanding of future global networks. This paper describes the results of experiments with different implementations of TCP on a high speed ATM/SONET network over high delay and noisy channels. Comparisons are also made with host/traffic configurations over various smaller BDP systems, experimental comparisons o... View full abstract»

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  • A new fast cell resequence mechanism for multipath ATM switches

    Publication Year: 1999, Page(s):297 - 299
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (48 KB)

    A new cell resequence mechanism is proposed to restore the cell sequence in multipath ATM switches. Since the proposed mechanism uses per-VC logical queues which store only the cells belonging to the same VC, the mechanism can reduce processing time compared to conventional resequence mechanisms. The mechanism also has no limitation on the peak rate of the VCs and needs no arbitration function to ... View full abstract»

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  • Shaping of traffic streams through data spacing

    Publication Year: 1999, Page(s):300 - 302
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (66 KB)

    A traffic shaping algorithm, based on suitable spacing of data units, is proposed and validated both theoretically and by simulation. It ensures a "tight" upper bound to the queue-length distribution at subsequent multiplexing stages, being essentially an effective-rate-enforcement mechanism in the asymptotic regime. It does not presume any stationarity, homogeneity or Markovian property of the in... 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