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Communications Magazine, IEEE

Issue 9 • Date September 2007

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Displaying Results 1 - 25 of 37
  • Front cover - IEEE Communications Magazine - Front cover

    Page(s): c1
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    Freely Available from IEEE
  • IEEE Communications Magazine - Table of Contents

    Page(s): 2 - 4
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    Freely Available from IEEE
  • Smart Communications Technologies for Tomorrow (SCOTT) IEEE ICC 2007 Conference at Glasgow, Scotland [The President's Page]

    Page(s): 6 - 8
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    Freely Available from IEEE
  • Society News

    Page(s): 10 - 18
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    Freely Available from IEEE
  • The Future of Convergence in the Communications Industry

    Page(s): 12 - 14
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    Discusses the future of network convergence in the telecommunications industry as well as the provision of bundled communications services. This is a summary of a speech presented by Arun Sarin at the opening of the CEO Forum for the ICC Conference held in Glasgow, Scotland in June 2007. View full abstract»

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  • The Web is Everywhere [Note from the Editor-in-Chief]

    Page(s): 16
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  • Staying Protected from "Social Engineering"

    Page(s): 20 - 21
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (744 KB) |  | HTML iconHTML  

    "Your Internet Connection" we provided wealth of information on different protection tools. Although these tools are indeed necessary for anyone brave enough to surf the Internet today, there is no substitute for sound judgement. "Your Internet Connection" describing Internet security resources, the Anti-Phishing Working Group's (APWG) and the Phishing Incident Reporting and Termination squad (http://wiki.castlecops.com/PIRT) were listed among other important security resources.Many criminals generating their garbage from the "sewers of the Internet" employ so called "social engineering" techniques. Just to make sure we are on the same page, here is the definition for the term "social engineering" from SearchSecurity.com: "In computer security, social engineering is a term that describes a non-technical kind of intrusion that relies heavily on human interaction and often involves tricking other people to break normal security procedures. View full abstract»

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  • COMSOC needs your help

    Page(s): 22
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  • MILCOM Celebrates 26th year in the Sunshine State [Conference Preview]

    Page(s): 24
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  • Conference Calendar

    Page(s): 26 - 28
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  • New products

    Page(s): 30
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  • CommuniCrostic Puzzle

    Page(s): 32
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  • Product Spotlights

    Page(s): 34
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (563 KB) |  | HTML iconHTML  

    First Page of the Article
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  • Product Spotlights

    Page(s): 35
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    First Page of the Article
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  • Open Call [IEEE Radio Communications: Components, Systems, and Networks]

    Page(s): 38
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    The three articles in this special section are an open call for papers that address the following topics: unified spectrum management; soft-decision in UMTS systems; and polar transmitters for wireless communications. View full abstract»

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  • Trends in DSP

    Page(s): 40 - 42
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    A new specification was released that, for the first time, "standardizes" the software and firmware infrastructure for a broad base of specialized signal processing devices used within the baseband signal/modem processing engines of an advanced wireless system. Dubbed MHAL, or modem hardware abstraction layer, this open specification facilitates the reuse of the functional software and firmware components that implement a radio's physical layer channel processing across different radio platforms. The benefits of such a specification are obvious: code reuse such as this provides significant savings in both the time to market and cost of development for subsequent radio products or upgrades to existing products. This in turn allows wireless original equipment manufacturers (OEMs) to offer their customers radio technologies with new features and capabilities faster and at reduced overall cost. Even with this benefit, however, a question remains as to whether MHAL will be broadly adopted across the wireless market. View full abstract»

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  • A Framework for Unified Spectrum Management (USM) in Heterogeneous Wireless Networks

    Page(s): 44 - 51
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    In the information age, spectrum is a valuable natural resource. Currently, there is a great deal of ongoing research into architectures for spectrum (or more generally, radio resource) management for next generation wireless communications systems. This article proposes a framework for unified spectrum management (USM), where both licensed and license-exempt bands are managed by a hierarchical band management method. An outline for developing the required entities in this architecture is introduced, as well as the protocols that are required for USM operation. We also discuss spatial and temporal coordination of resource usage in such a heterogeneous wireless environment. Finally, a number of open research issues for future study are outlined. View full abstract»

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  • A Method for Soft-Decision UMTS Cell Reselection Based on a Database Solution

    Page(s): 52 - 57
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    A novel idea of cell reselection in a UMTS system is presented in this article. The proposed method offers performance enhancements when compared to the algorithm that complies with the 3GPP specifications. This reselection algorithm specifics new criteria that are iteratively computed in every measurement cycle. And to continuously perform the iterative nature of the algorithm, a database solution also is proposed. The database must follow certain rules to maintain the required efficiency. View full abstract»

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  • Polar Transmitters for Wireless Communications

    Page(s): 58 - 63
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    Future wireless communications will require multimode radio transceivers. This article looks at two possible transmitter architectures: direct upconversion and polar modulation. A brief review of the direct upconversion approach reveals some key limitations. This leads to a detailed study of the polar transmitter focusing on its operation, design challenges, and potential benefits. Its multi- mode capability and low power consumption are illustrated by a prototype design of a GSM, EDGE, and WCDMA polar transmitter. The efficiency of the polar transmitter is shown as a key enabler of future systems using OFDM modulation with high peak-to-average signals. View full abstract»

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  • Technologies in Multihop Cellular Networks [Guest Editorial]

    Page(s): 64 - 65
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    The six papers in this special section are devoted to technologies in multi-hop communications services. View full abstract»

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  • Multihop Cellular Networks: Potential Gains, Research Challenges, and a Resource Allocation Framework

    Page(s): 66 - 73
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    Recently, there has been increasing interest in integrating multihop relaying functionalities into cellular wireless networks. Multihop cellular networks can potentially enhance coverage, data rates, QoS performance in terms of call blocking probability, bit error rate, as well as QoS fairness for different users. However, in-depth investigations and careful system designs are required to exploit these potential advantages. Specifically, routing and resource allocation algorithms should be designed such that the maximum performance gain can be achieved. A number of different architectures, protocols, and analytical models for MCNs have been proposed in the literature where different system aspects were investigated. This article aims to present an overview of existing work in this area, pointing out key research issues and their possible solutions. Also, we present a resource allocation framework for out-of- band relaying. The throughput enhancement due to the proposed framework is demonstrated through numerical results. View full abstract»

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  • Implementation Issues for OFDM-Based Multihop Cellular Networks

    Page(s): 74 - 81
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    In this article we present various issues that need careful design for the successful implementation of OFDMA-based multihop cellular networks which need incorporation of relay terminals. The first issue we present is synchronization. We show that it is not a problematic issue for infrastructure-based relaying, where the relay is deployed by a system operator at strategic points in the cell. Second, we focus on the advantage of adaptive relaying and provide a frame structure to enable adaptive relaying in a cellular network operating according to the IEEE 802.16e standard. The third issue we present is related to hardware implementation aspects. Hardware performance and resource usage analysis will show that cooperative diversity schemes increase hardware resource usage and power/energy consumption at mobile terminals. The last issue we present is within the context of link layer ARQ, where we propose a novel retransmission method, named local retransmission-ARQ (LR-ARQ), which is designed to take advantage of the multihop nature of the cellular network. Practically, we show that LR-ARQ improves performance with respect to its single-hop counterpart in terms of cell latency, goodput, and throughput. View full abstract»

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  • Application of IEEE 802.16 Mesh Networks as the Backhaul of Multihop Cellular Networks

    Page(s): 82 - 90
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    Cellular networks have been widely used to support many new audio-and video-based multimedia applications. The demand for higher data rate and diverse services has driven the research on multihop cellular networks (MCNs). With its ad hoc network features, an MCN can offer many additional advantages, such as increased network throughput, scalability and coverage. However, providing ad hoc capability to MCNs is challenging as it may require proper wireless interfaces. In this article, the architecture of IEEE 802.16 network interface to provide ad hoc capability for MCNs is investigated, with its focus on the IEEE 802.16 mesh networking and scheduling. Several distributed routing algorithms based on network entry mechanism are studied and compared with a centralized routing algorithm. It is observed from the simulation results that 802.16 mesh networks have limitations on providing sufficient bandwidth for the traffic from the cellular base stations when a cellular network size is relatively large. View full abstract»

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  • A Generic Framework for Mobility Modeling and Performance Analysis in Next-Generation Heterogeneous Wireless Networks

    Page(s): 92 - 99
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    Integration of different wireless radio cellular technologies is emerging as an effective approach to accommodate the increasing demand of next-generation multimedia-based applications. In such systems user roaming among different technologies, commonly known as vertical handoff, will significantly affect different aspects of network design and planning due to the characteristically wide-ranging diversity in access technologies and supported applications. Hence, the development of new mobility models that accurately depict vertical mobility is crucial for studying different design problems in these heterogeneous systems. This article presents a generic framework for mobility modeling and performance analysis of integrated heterogeneous networks using phase-type distributions. This framework realizes all modeling requirements in next-generation user mobility including accuracy, analytical tractability, and accommodating the correlation between different residence times within different access technologies. Additionally, we present general guidelines to evaluate application performance based on the new mobility models introduced in this article. We show the accuracy of our modeling approach through simulation and analysis given different applications. View full abstract»

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  • Nested Network Mobility on the Multihop Cellular Network

    Page(s): 100 - 104
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    The multihop cellular network architecture has been actively studied due to its capability to significantly increase cellular system capacity and coverage, and at the same time greatly reduce the transmission range of mobile nodes. The majority of the literature on MCN, however, is based on discussions from the physical or link layer point of view. In this article we look at the logical MCN architecture from the IP layer aspect. We believe that this aspect is critical to general deployment of Internet applications on the MCN because IP is the dominant supporting protocol for such applications. We introduce a new architecture based on the integration of nested network mobility (nested NEMO), which is a pure IP layer architecture, and MCN. We name the resulting architecture nested NEMO on MCN. We illustrate how nested NEMO on MCN operates and how it realizes the advantages provided by MCN on the IP layer. We also unveil a potential problem specific to the nested NEMO on MCN architecture: recursive IP fragmentation. A simple technique to overcome this problem is proposed. View full abstract»

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Aims & Scope

IEEE Communications Magazine covers all areas of communications such as lightwave telecommunications, high-speed data communications, personal communications systems (PCS), ISDN, and more.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Sean Moore
Centripetal Networks