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Communications Magazine, IEEE

Issue 2 • Date Feb. 2006

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Displaying Results 1 - 25 of 30
  • IEEE Communications Magazine - Feb. 2006

    Page(s): 0_1
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    Freely Available from IEEE
  • Table of Contents - Vol. 44, No. 2

    Page(s): 2 - 4
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    Freely Available from IEEE
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  • Mobile Web Services [Book Review]

    Page(s): 8
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  • Conference calendar

    Page(s): 12 - 16
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  • New products [4 product abstracts]

    Page(s): 18
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    Freely Available from IEEE
  • CommuniCrostic puzzle: Puzzle No. 276

    Page(s): 20
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    Freely Available from IEEE
  • Global Communications Newsletter

    Page(s): 1 - 2
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    Freely Available from IEEE
  • IEEE Optical Communications: Design, technologies, and Applications - Feb. 2006

    Page(s): 0_2
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  • Table of contents - Vol 4 No 1

    Page(s): S1
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  • OFC/NFOEC: A good long look at the future

    Page(s): S4 - S25
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  • Fiber to the Home: The New Empowerment [Book Review]

    Page(s): S6
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  • Laser diode burn-in and reliability testing

    Page(s): 4 - 7
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (196 KB) |  | HTML iconHTML  

    More than 99 percent of all lasers manufactured in the world today are semiconductor laser diodes. Reliability is a concern in every laser diode application, whether it is a simple $10 laser pointer or a space-qualified optical transmitter link. The commercial success of a laser supplier rests largely on his ability to develop a robust manufacturing process that consistently produces reliable devices combined with the quantitative assurances he can provide to his customers proving the reliability of his devices. Over the past two decades, laser diode reliability testing techniques and equipment have evolved to support the diverse development of laser diodes. View full abstract»

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  • RINGOSTAR: an evolutionary performance-enhancing WDM upgrade of IEEE 802.17 resilient packet ring

    Page(s): 8 - 14
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (247 KB) |  | HTML iconHTML  

    To upgrade IEEE 802.17 Resilient Packet Ring networks by WDM, most previously reported approaches deploy WDM on the ring, requiring modifications of all nodes at the architecture and/or protocol level without significantly enhancing the performance of RPR apart from increased capacity and optical bypassing capability. In this article we aim at rethinking the box. Leveraging on the dark fiber infrastructure abundantly available in today's metropolitan areas, a subset of RPR nodes are interconnected by a single-hop star WDM subnetwork in a pay-as-you-grow manner. Building on RPR's destination stripping, wrapping, and steering techniques, we describe and examine two novel evolutionary performance-enhancing techniques: proxy stripping and protectoration. Our findings show that the resultant RINGOSTAR network not only dramatically increases spatial reuse, provides fairness as well as fast and efficient resilience against multiple failures but also supports both metro core's uniform and in particular metro edge's strongly hubbed traffic in a highly efficient way View full abstract»

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  • WDM Ethernet passive optical networks

    Page(s): 15 - 22
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (137 KB) |  | HTML iconHTML  

    WDM EPONs not only allow for cautious pay-as-you-grow upgrades of single-channel TDM EPONs but also avoid linearly increasing polling cycle times for an increasing number of ONUS. In this article, we first provide a comprehensive overview of the state of the art of TDM EPONs and recently reported dynamic bandwidth allocation algorithms, including decentralized scheduling schemes. After reviewing previous work on WDM EPONs, we address the requirements of WDM upgraded EPONs and make recommendations on an evolutionary WDM upgrade at the architecture, protocol, and dynamic bandwidth allocation algorithm levels, taking backward compatibility with MPCP and future-proofness against arbitrary WDM ONU structures into account. We describe and compare online and offline scheduling paradigms for WDM EPONs. Our simulation results indicate that online scheduling can achieve lower delays, especially at high loads. We outline areas of future research on WDM EPONs. View full abstract»

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  • WDM optical network testbed and distributed storage application

    Page(s): 23 - 29
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (124 KB) |  | HTML iconHTML  

    In this article we present the details of a generalized multiprotocol label switching controlled wavelength-division multiplexing (WDM) optical network developed under the Optical Network Focused Interest Group (ONFIG) program in Singapore. The WDM network is controlled through a GMPLS control plane that consists of CR-LDP, LMP, and OSPF-TE. We conducted various field trials on the GMPLS-capable WDM optical network testbed with the main focus on distributed storage service application. We developed and evaluated a distributed storage services application on the WDM optical network testbed and demonstrated that incorporating a lightweight data transport protocol with optical network control could be an efficient approach for data-intensive storage applications by exploiting the dynamic connection establishment and backup protection features. View full abstract»

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  • Evolving 3G mobile systems: broadband and broadcast services in WCDMA

    Page(s): 30 - 36
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (133 KB) |  | HTML iconHTML  

    The third-generation WCDMA standard has been enhanced to offer significantly increased performance for packet data and broadcast services through the introduction of high-speed downlink packet access (HSDPA), enhanced uplink, and multimedia broadcast multicast services (MBMS). This article provides an overview of the key technologies used, the reasons behind their selection, and their integration into WCDMA. Performance results are also included to exemplify the performance possible in an evolved WCDMA network. View full abstract»

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  • CDMA2000 1×EV-DO revision a: a physical layer and MAC layer overview

    Page(s): 37 - 49
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (183 KB) |  | HTML iconHTML  

    This article presents key enhancements to CDMA2000 1×EV-DO systems embodied in 1×EV-DO Revision A. These enhancements provide significant gains in spectral efficiency and substantial improvements in QoS support relative to 1×EV-DO Revision 0. In particular, 1×EV-DO Revision A approximately doubles the uplink spectral efficiency and doubles the number of terminals with delay-sensitive applications that can be simultaneously supported on the system. It provides substantial reduction in latencies (approximately 50 percent) during both connection setup and the connected state. It offers comprehensive network control over terminal and application performance to enable the desired trade-offs between capacity and latency/ fairness, thereby providing full QoS support and enhanced user experience. It also provides coverage improvement (approximately 1.5 dB) relative to 1×EV-DO Revision 0. This enables operators to offer services such as VoIP, video telephony, mobile network gaming, push-to-talk, Web browsing, file transfer, and video on demand to a larger number of simultaneous users. The 1×EV-DO Revision A network can provide downlink sector capacity of 1500 kb/s and uplink capacity of 500 kb/s (two-way receive diversity) or 1200 kb/s (four-way receive diversity) with 16 active users per sector, using just 1.25 MHz of the spectrum. View full abstract»

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  • VoIP over cdma2000 1xEV-DO revision A

    Page(s): 50 - 57
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (146 KB) |  | HTML iconHTML  

    In this article we analyze performance of VoIP services over 1xEVDO-Revision A (DO-Rev A) networks and show that high-quality VoIP with unconstrained mobility and high capacity can be achieved. Together with quality of service (QoS) requirements, we emphasize practical issues such as mobility, degradation of feedback-channel quality, and packet overheads. Novel techniques are presented for voice processing such as smart blanking and adaptive dejitter playback buffer with time warping. These techniques help to meet QoS constraints to achieve a circuit-like voice quality while improving overall capacity. Detailed end-to-end simulations are presented and system capacity is analyzed under the QoS and system stability constraints. We claim that DO-Rev A can provide VoIP capacity comparable to circuit-switched cellular CDMA technologies (e.g., IS-2000) and simultaneously carry significant amount of other types of traffic such as non-delay sensitive applications and downlink multicast. View full abstract»

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  • Implementing interference cancellation to increase the EV-DO Rev A reverse link capacity

    Page(s): 58 - 64
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (141 KB) |  | HTML iconHTML  

    This article provides the principles and practice of how interference cancellation can be implemented on the EV-DO Rev A reverse link. It is shown that applying interference cancellation to CDMA achieves the multiple access channel sum rate capacity for either frame synchronous or asynchronous users. The per user SINR gain from space-time interference cancellation translates directly into a CDMA capacity gain of the same factor, allowing EV-DO Rev A to support more users with higher data rates. We demonstrate how interference cancellation can be added to base station processing without modifying user terminals, EV-DO standards, or network coverage. We present commercially viable receiver architectures for implementing interference cancellation with the asynchronism and H-ARQ of EV-DO RevA, and explain why closed loop power control can operate the same way it does today. Network level simulations over a wide range of channels confirm that interference cancellation offers significant capacity gains for all users, while maintaining the same link budget and system stability. View full abstract»

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  • Macro-mobility management in EVDO

    Page(s): 65 - 72
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (131 KB) |  | HTML iconHTML  

    This article describes the design and best practices for macromobility management in EV-DO, including mobility across EV-DO subnets and mobility across network that support different air interface technology (i.e., between 1x and EV-DO, or between different revisions of EVDO). In particular, the following three topics related to the EV-DO systems are discussed in detail: Conditions under which an EV-DO subnet should be created and how to create such subnets; Mobility across areas covered by sectors with different physical layer capabilities without creating EV-DO subnets; Data session mobility between networks supporting EV-DO and 1x. View full abstract»

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  • Running cellular/PWLAN services: practical considerations for cellular/PWLAN architecture supporting interoperator roaming

    Page(s): 73 - 84
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (238 KB) |  | HTML iconHTML  

    To offer wireless data access services that are more efficient than GPRS or UMTS networks, public WLANs are in a predominant position to embrace the wireless broadband era. Reusing the existing mechanisms for user authentication, access control, billing, and roaming handling procedures in mobile territory to construct a complementary network, public WLAN (PWLAN) has drawn the attention of cellular operators such as Vodafone and T-Mobile. In this article we aim to investigate a practical end-to-end PWLAN architecture capable of using GPRS/UMTS SIM-based authentication for current mobile users and carrying out Web-based authentication for occasional users without SIM modules simultaneously. Additionally, we consider a confederation of various PWLAN service providers by a RADIUS-based roaming mechanism to leverage the existing resources of cellular operators. The proposed considerations and guidelines provide a baseline skeleton to build an extendable environment and successfully construct a flexible cellular/PWLAN hotspot in mobeeLAN service. 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