IEEE Communications Letters

Issue 5 • May 2000

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Displaying Results 1 - 10 of 10
  • A direction-based location update scheme with a line-paging strategy for PCS networks

    Publication Year: 2000, Page(s):149 - 151
    Cited by:  Papers (50)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (57 KB)

    On the problem of location update and terminal paging, many schemes using ring-paging strategies have been proposed. However, sequentially paging the rings surrounding the mobile user's last updated location may cause large paging cost. We propose a direction-based location update (DBLU) scheme using a line-paging strategy to reduce the paging cost. A moving direction identification mechanism usin... View full abstract»

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  • Performance analysis of generalized selection combining with switching constraints

    Publication Year: 2000, Page(s):152 - 154
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (76 KB)

    Generalized selection combining (GSC), in which the best L/sub c/ out of L independent diversity channels are linearly combined has been previously proposed and analyzed for Rayleigh fading channels. GSC is a less complex alternative to maximal ratio combining (MRC) that provides a performance gain over traditional selection combining (SC). Both MRC and SC are special cases of CSC, with L/sub c/=L... View full abstract»

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  • On the capacity of slotted Aloha with Rayleigh fading: the role played by the number of interferers

    Publication Year: 2000, Page(s):155 - 157
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (76 KB)

    The role played by the number of interferers and the modulation choice in the performance of slotted Aloha networks with Rayleigh fading is investigated and discussed; the case of multiple transmitted power classes is also considered. A new capture model which takes the number of actual interferers into account is proposed. The network capacity is analytically estimated, and significant difference... View full abstract»

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  • Copyright protection for digital data

    Publication Year: 2000, Page(s):158 - 160
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (62 KB)

    If /spl Gamma//sub p/ is a p-ary code of length n, and a and b are two codewords, then c is called a descendant of a and b if c/sub i//spl isin/{a/sub i/, b/sub i/} for i=1,...,n. We are interested in codes /spl Gamma//sub p/ with the property that for any two codewords a and b their only descendant codewords are a and b themselves. This way a coalition of two users who are given codewords a and b... View full abstract»

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  • Lattice code decoder for space-time codes

    Publication Year: 2000, Page(s):161 - 163
    Cited by:  Papers (532)  |  Patents (39)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (104 KB)

    We explore the lattice sphere packing representation of a multi-antenna system and the algebraic space-time (ST) codes. We apply the sphere decoding (SD) algorithm to the resulted lattice code. For the uncoded system, SD yields, with small increase in complexity, a huge improvement over the well-known V-BLAST detection algorithm. SD of algebraic ST codes exploits the full diversity of the coded mu... View full abstract»

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  • Effective forward-channel capacity of non-dedicated CDPD networks

    Publication Year: 2000, Page(s):164 - 166
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (63 KB)

    Cellular digital packet data (CDPD) is a mobile packet data technology developed to operate on the spectrum assigned to a telephone cellular network. Since it operates on non-dedicated RF channels, it is subject to channel hopping and its performance is affected by the traffic profile of the underlying telephone system. We develop formulas expressing the normalized forward channel capacity in term... View full abstract»

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  • Overflow probability in shared cell switched buffers

    Publication Year: 2000, Page(s):167 - 169
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (86 KB)

    The ubiquity of the cell switching technique is a clear indication of its continued importance for the future of telecommunications worldwide. The performance of shared buffers in cell switches provides substantial improvement over switches with separate output buffers. The conventional approach to shared buffer analysis is numerical convolution; however, previous work provides an analytical solut... View full abstract»

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  • Generation of bivariate Rayleigh and Nakagami-m fading envelopes

    Publication Year: 2000, Page(s):170 - 172
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (82 KB)

    The paper presents an algorithm for generating bi-variate Nakagami-m distributed fading envelopes with any desired power cross correlation. For this algorithm, the fading index m should be a positive integer (m=1 for Rayleigh fading). Its applications include dual-branch selection combining diversity, dual-branch switch diversity systems, and wireless channel modeling. View full abstract»

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  • A novel U-turn counting hangup detection algorithm for SDPSK modulation

    Publication Year: 2000, Page(s):173 - 175
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (93 KB)

    A new hangup detection algorithm for symmetric differential phase-shift keying (SDPSK) modulation is proposed. Hangup is detected by observing phase transition patterns in the received SDPSK signal trajectory. The average pull-in times with and without the proposed hangup detector are compared. Simulation results show that the proposed algorithm significantly reduces the average pull-in time when ... View full abstract»

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  • Vegas plus: improving the service fairness

    Publication Year: 2000, Page(s):176 - 178
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (37 KB)

    TCP Vegas is a congestion avoidance scheme designed to prevent the periodic packet loss which occurs in traditional schemes. Since Vegas successfully avoids such packet loss, it achieves much higher throughput than TCP Reno. However, it does not concern the fairness among source-destination pairs with different round-trip times (RTTs). We propose a different mechanism to adjust the window size, th... 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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Meet Our Editors

Editor-in-Chief
Octavia Dobre
Memorial University, Canada