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IEEE Communications Letters

Issue 4 • Date April 2002

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Displaying Results 1 - 13 of 13
  • Blind adaptive channel estimation for dual-rate DS/CDMA signals

    Publication Year: 2002, Page(s):129 - 131
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (238 KB) | HTML iconHTML

    This letter proposes the subspace-based blind adaptive channel estimation algorithm for dual-rate quasi-synchronous DS/CDMA systems, which can operate at the low-rate (LR) or high-rate (HR) mode. Simulation results show that the proposed blind adaptive algorithm at the LR mode has a better performance than that at the HR mode, with the cost of an increasing computational complexity. View full abstract»

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  • Study of MR-DPSK modulation

    Publication Year: 2002, Page(s):132 - 134
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (227 KB) | HTML iconHTML

    An alternative modulation technique, called multi-ring DPSK (MR-DPSK), is proposed. The proposed technique can achieve lower variation of the transmitted power and less hardware complexity than can differentially encoded amplitude-and phase-shift keying (DAPSK). It is, thus, more suitable for mobile applications due to its features of lower power dissipation, lower error probability and lower hard... View full abstract»

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  • Average level crossing rate and average fade duration of low-order maximal ratio diversity with unbalanced channels

    Publication Year: 2002, Page(s):135 - 137
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (206 KB) | HTML iconHTML

    The average level crossing rate and average fade duration of a maximal ratio diversity combiner, operating on independent, unequal power Rayleigh fading branches in isotropic scattering, are derived in closed-form for dual-branch diversity, and as definite integrals for threefold and fourfold diversity. View full abstract»

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  • An analytical model to predict the probability density function of elevation angles for LEO satellite systems

    Publication Year: 2002, Page(s):138 - 140
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (225 KB) | HTML iconHTML

    Based on Earth-satellite geometry, an analytical model is proposed to predict the probability density function (pdf) of elevation angles from an Earth station to a circular low-Earth-orbit (LEO) satellite constellation. Unlike currently available empirical models using a great deal of path data for model-fitting to obtain results applicable only to the specified systems (for example, the Iridium o... View full abstract»

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  • Group deregistration strategy for PCS networks

    Publication Year: 2002, Page(s):141 - 143
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (194 KB) | HTML iconHTML

    This letter proposes a novel deregistration strategy-group deregistration-for PCS networks. In the proposed strategy, instead of deregistering a mobile terminal (MT) right after the MT leaves its registration area (RA), the home location register (HLR) keeps the MT's identification in a list associated with the RA. When the next registration from the RA arrives, the HLR sends the MT identification... View full abstract»

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  • Generalized moment estimators for the Nakagami fading parameter

    Publication Year: 2002, Page(s):144 - 146
    Cited by:  Papers (33)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (195 KB) | HTML iconHTML

    Moment-based estimation of the Nakagami-m fading parameter is studied. A family of new, generalized, estimators, based on real (integer and possibly noninteger) sample moments, is derived. A new integer-moment estimator that outperforms known integer-moment estimators is presented. The new moment-based estimators are asymptotically unbiased and efficient. View full abstract»

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  • Hopfield multiuser detection of asynchronous MC-CDMA signals in multipath fading channels

    Publication Year: 2002, Page(s):147 - 149
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (213 KB) | HTML iconHTML

    Multiuser reception using Hopfield neural network (HNN) for asynchronous multicarrier code-division multiple access (MC-CDMA) in a multipath fading channel is investigated. We have shown that by the appropriate choice of HNN parameters from the channel state information, the HNN can collectively resolve the multipath fading effects and the multiple-access interference in the system. View full abstract»

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  • Differentially en/decoded orthogonal space-time block codes with APSK signals

    Publication Year: 2002, Page(s):150 - 152
    Cited by:  Papers (28)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (217 KB) | HTML iconHTML

    In this letter, we propose a differential en/decoding scheme for Alamouti's orthogonal space-time code using amplitude/phase-shift keying (STC-APSK) signals and two transmit antennas. It is compared with the differential en/decoding scheme using 16APSK and single transmit antenna. It is also compared with the differential en/decoding scheme for Alamouti's orthogonal space-time code using 16PSK (ST... View full abstract»

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  • On the hierarchical least-squares algorithm

    Publication Year: 2002, Page(s):153 - 155
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB) | HTML iconHTML

    A so-called hierarchical recursive least-squares (HRLS) algorithm was suggested in a recent letter in an attempt to reduce the computational burden and improve the convergence rate of the classical RLS algorithm. The discussion of HRLS in the original letter, however, has several unclear points; in particular no clear explanation was offered for the good simulation results reported. In this letter... View full abstract»

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  • Design of an on-demand traffic converger

    Publication Year: 2002, Page(s):156 - 158
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (185 KB) | HTML iconHTML

    Aggregating the traffic to different forwarding equivalence class is an indispensable and significant phase for layer-3 and layer-2 hybrid switching. Regarding existed schemes mainly focusing on high efficiency of network resource but taking little consideration on user's demand, we put forward a new scalable framework for traffic partitioning based on some generalized concepts and optional priori... View full abstract»

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  • Batched patch caching for streaming media

    Publication Year: 2002, Page(s):159 - 161
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (211 KB) | HTML iconHTML

    This letter elaborates on a scheme that combines batch patching at an origin server and prefix/interval caching at an edge server receiving the clients' requests. We derive a cost function that factors in the aggregate backbone rate, the cache occupancy, and the disk bandwidth utilization. We define the optimal batched patch caching strategy as a function of the client request rate. Finally, we sh... View full abstract»

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  • Efficient buffer sharing in shared memory ATM systems with space priority traffic

    Publication Year: 2002, Page(s):162 - 164
    Cited by:  Papers (10)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (187 KB) | HTML iconHTML

    In this letter we study the problem of the optimal design of buffer management policies within the class of pushout and expelling policies for a shared memory asynchronous transfer mode (ATM) switch or demultiplexer fed by traffic containing two different space priorities. A numerical study of the optimal policies for small buffer sizes is used to help design heuristics applicable to large buffer ... View full abstract»

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  • Minimum price inter-domain routing algorithm

    Publication Year: 2002, Page(s):165 - 167
    Cited by:  Papers (9)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (198 KB) | HTML iconHTML

    We show a minimum price (MP) inter-domain routing algorithm that selects the cheapest paths among a number of independent domains, used for supplying end users with application services. The price of the network service is determined by the so-called service parameters and network parameters. The former represents the negotiable quality of service (QoS) parameters, summarized by the so-called virt... 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