IEEE Communications Letters

Issue 11 • Nov. 2004

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  • Table of contents

    Publication Year: 2004, Page(s): c1
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  • IEEE Communications Letters publication information

    Publication Year: 2004, Page(s): c2
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  • On the code and interleaver design of broadband OFDM systems

    Publication Year: 2004, Page(s):653 - 655
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB) | HTML iconHTML

    In this letter, we study the performance of space-frequency-coded orthogonal frequency-division modulation systems over multiple-input multiple-output frequency-selective channels. The diversity and coding advantages are derived in terms of the minimum Hamming distance and the minimum squared product distance of the code as well as the relative frequency locations (tones) where a pair of codewords... View full abstract»

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  • Adaptive selection combining for soft handover in OVSF W-CDMA systems

    Publication Year: 2004, Page(s):656 - 658
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB) | HTML iconHTML

    In W-CDMA, soft handover is supported at cell boundaries to maintain communication quality. The maximal ratio combining (MRC) and generalized selection combining (GSC) , are two possible approaches. However, soft handover is resource-intensive. In this letter, we propose an adaptive selection combining (ASC) scheme that can switch flexibly between MRC and GSC so as to take care of both channel loa... View full abstract»

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  • Packet combining with adaptive retransmission control in DS-CDMA random access networks

    Publication Year: 2004, Page(s):659 - 661
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB) | HTML iconHTML

    Packet combining with adaptive retransmission control (ARC) in DS-CDMA random access networks has been investigated. The proposed system uses diversity packet combining while adaptively adjusting the retransmission probability of backlog users to optimize packet retransmissions. A soft decision DS-CDMA analysis is used to derive the optimum channel input for ARC. Simulation results show that packe... View full abstract»

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  • Erlang capacity of multiaccess systems with service-based access selection

    Publication Year: 2004, Page(s):662 - 664
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB) | HTML iconHTML

    In this letter, we provide the lower and upper bounds of Erlang capacity of multiaccess systems supporting several different radio access technologies in the multiservice scenario, by considering two extreme operation methods; separate and common operation. In a numerical example with GSM/EDGE-like and WCDMA-like subsystems, it is shown that the common operation method can provide up to 60% Erlang... View full abstract»

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  • Delay control for non-real-time data in interactive multimedia satellite networks

    Publication Year: 2004, Page(s):665 - 667
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB) | HTML iconHTML

    Non-real-time packets in the interactive multimedia satellite network suffer inherent delay in cases of traffic congestion. Moreover, these packets may be discarded from the queue if they are not sent within a certain time. The objective of this study is to develop a real-time method in order to minimize the packet discard rate. Extensive evaluation results show that the proposed method performs v... View full abstract»

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  • EXIT charts for turbo trellis-coded modulation

    Publication Year: 2004, Page(s):668 - 670
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB) | HTML iconHTML

    In this letter, we extend the previously proposed extrinsic information transfer charts (EXIT) method to the analysis of the convergence of turbo codes to turbo trellis-coded modulation (TTCM) schemes. The effectiveness of the proposed method is demonstrated through examples. The proposed method provides a convenient way to systematically compare between schemes and thus can be used as a tool in t... View full abstract»

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  • Iterative construction of reversible variable-length codes and variable-length error-correcting codes

    Publication Year: 2004, Page(s):671 - 673
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB) | HTML iconHTML

    We propose a generic algorithm for the construction of efficient reversible variable-length codes (RVLCs) and variable-length error-correcting (VLEC) codes, which optimizes the codeword length distribution. The algorithm may be applied to any existing codeword selection mechanism, and it is capable of generating codes of higher efficiency in comparison to the algorithms disseminated in the literat... View full abstract»

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  • Multilevel LDPC codes design for semi-BICM

    Publication Year: 2004, Page(s):674 - 676
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB) | HTML iconHTML

    In this letter, we joined the multilevel coding (MLC) and bit-interleaved coded modulation (BICM) together by using Gray mapping, which is called semi-BICM. To perform well at signal-to-noise ratio (SNR) close to the capacity of the additive white Gaussian noise (AWGN) channel, regular low density parity check (LDPC) codes are discussed with parallel independent decoding (PID). The numerical resul... View full abstract»

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  • A carrier frequency offset estimator with minimum output variance for OFDM systems

    Publication Year: 2004, Page(s):677 - 679
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB) | HTML iconHTML

    In this letter, we propose a blind carrier frequency offset (CFO) estimator with high resolution and high bandwidth efficiency for orthogonal frequency-division multiplexing (OFDM) systems. The proposed estimator utilizes minimum output variance to estimate CFO. Simulation results show that the proposed estimator is highly accurate and reliable for OFDM systems. View full abstract»

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  • A path inflation control strategy for dynamic traffic grooming in IP/MPLS over WDM network

    Publication Year: 2004, Page(s):680 - 682
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB) | HTML iconHTML

    The use of alternate routes for traffic grooming in IP/MPLS over wavelength-division multiplexing (WDM) networks may lead to the propagation of congestion from one link to others in the IP/MPLS layer. This can be tackled by using the path inflation control (PIC) strategy proposed here for operating an IP/MPLS over WDM network in the overlay model. This supports dynamic traffic grooming with less b... View full abstract»

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  • Intra-ONU bandwidth scheduling in Ethernet passive optical networks

    Publication Year: 2004, Page(s):683 - 685
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB) | HTML iconHTML

    Quality-of-service (QoS) support in Ethernet passive optical networks (EPON) is a crucial concern. However, most studies have only focused on optical line terminal (OLT) capacity allocation amongst multiple optical network units (ONU), and the further issue of intra-ONU allocation remains open. In this work a novel decentralized intra-ONU solution is presented using virtual-time schedulers. Result... View full abstract»

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  • A QoS index for IP services to effectively support usage-based charging

    Publication Year: 2004, Page(s):686 - 688
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB) | HTML iconHTML

    The goal of this letter is to present a model to compute a quality-of-service (QoS) index to characterize IP services. Then, we show how such a score may be used in a clear and flexible way for defining advanced usage-based tariff criteria to charge QoS guaranteed network services to address the dynamics of the expected future telecommunications scenario. View full abstract»

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  • Practical OSPF traffic engineering

    Publication Year: 2004, Page(s):689 - 691
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB) | HTML iconHTML

    Open Shortest Path First (OSPF) traffic engineering (TE) is intended to bring long-awaited traffic management capabilities into IP networks, which still rely on today's prevailing routing protocols: OSPF or IS-IS. In OSPF, traffic is forwarded along, and split equally between, equal cost shortest paths. In this letter, we formulate the basic requirements placed on a practical TE architecture built... View full abstract»

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  • An information theory based framework for optimal link state update

    Publication Year: 2004, Page(s):692 - 694
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB) | HTML iconHTML

    In this letter, based on information theory, we present a theoretical framework for the optimal link-state update, upon which efficient link-state update policies may be developed. View full abstract»

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  • IEEE Communications Letters Edics

    Publication Year: 2004, Page(s): 695
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  • IEEE Communications Letters Information for authors

    Publication Year: 2004, Page(s): 696
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  • IEEE Communications Society Information

    Publication Year: 2004, Page(s): c3
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  • IEEE Communications Letters blank page

    Publication Year: 2004, Page(s): c4
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Aims & Scope

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