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Communications Magazine, IEEE

Issue 6 • Date June 2011

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Displaying Results 1 - 25 of 35
  • IEEE Communications Magazine

    Publication Year: 2011 , Page(s): c1
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  • Table of contents

    Publication Year: 2011 , Page(s): 2 - 4
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  • ComSoc awards: Recognizing our colleagues [The President's Page]

    Publication Year: 2011 , Page(s): 6 - 8
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  • ComSoc 2011 election take time to vote [Society News]

    Publication Year: 2011 , Page(s): 10
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  • The spring 2011 and future exams [Certification Corner]

    Publication Year: 2011 , Page(s): 12
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  • IEEE DySPAN 2011 expands the research and deploy of next generation smart radio technologies in Aachen, Germany [Conference Report]

    Publication Year: 2011 , Page(s): 14 - 16
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  • Conference calendar

    Publication Year: 2011 , Page(s): 18
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  • New products

    Publication Year: 2011 , Page(s): 20
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  • Product spotlights

    Publication Year: 2011 , Page(s): 21
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  • Global communications newsletter

    Publication Year: 2011 , Page(s): 1 - 4
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  • Energy efficiency in communications: part II [Guest Editorial]

    Publication Year: 2011 , Page(s): 28 - 29
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  • Fundamental trade-offs on green wireless networks

    Publication Year: 2011 , Page(s): 30 - 37
    Cited by:  Papers (145)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1541 KB) |  | HTML iconHTML  

    Traditional mobile wireless network mainly design focuses on ubiquitous access and large capacity. However, as energy saving and environmental protection become global demands and inevitable trends, wireless researchers and engineers need to shift their focus to energy-efficiency-oriented design, that is, green radio. In this article, we propose a framework for green radio research and integrate the fundamental issues that are currently scattered. The skeleton of the framework consists of four fundamental tradeoffs: deployment efficiency-energy efficiency, spectrum efficiency-energy efficiency, bandwidth-power, and delay-power. With the help of the four fundamental trade-offs, we demonstrate that key network performance/cost indicators are all strung together. View full abstract»

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  • Degrees of freedom for energy savings in practical adaptive wireless systems

    Publication Year: 2011 , Page(s): 38 - 45
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (220 KB) |  | HTML iconHTML  

    We present a new design concept for adaptive wireless communications with new trade-offs between system performance and energy consumption. The system performance, in terms of bit error rate, outage probability, and achieved spectral efficiency, depends on constellation signaling, applied diversity, and channel estimation. Resources dedicated to channel estimation and feedback traffic contribute to the overall system and network energy consumption, and the resulting CO2 emission. We consider the trade-offs among different methodologies and parameters toward an energy-efficient green communication system design. Below, we discuss the degrees of freedom in the design of communications systems with imperfect channel estimation and diversity, and investigate their energy saving options. We present the case studies of single- and multicarrier systems applying both margin-adaptive and rate-adaptive pilot-assisted transmission. View full abstract»

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  • Green radio: radio techniques to enable energy-efficient wireless networks

    Publication Year: 2011 , Page(s): 46 - 54
    Cited by:  Papers (103)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (243 KB) |  | HTML iconHTML  

    Recent analysis by manufacturers and network operators has shown that current wireless networks are not very energy efficient, particularly the base stations by which terminals access services from the network. In response to this observation the Mobile Virtual Centre of Excellence (VCE) Green Radio project was established in 2009 to establish how significant energy savings may be obtained in future wireless systems. This article discusses the technical background to the project and discusses models of current energy consumption in base station devices. It also describes some of the most promising research directions in reducing the energy consumption of future base stations. View full abstract»

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  • Toward dynamic energy-efficient operation of cellular network infrastructure

    Publication Year: 2011 , Page(s): 56 - 61
    Cited by:  Papers (66)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1629 KB) |  | HTML iconHTML  

    The operation of cellular network infrastructure incurs significant electrical energy consumption. From the perspective of cellular network operators, reducing this consumption is not only a matter of showing environmental responsibility, but also of substantially reducing their operational expenditure. We discuss how dynamic operation of cellular base stations, in which redundant base stations are switched off during periods of low traffic such as at night, can provide significant energy savings. We quantitatively estimate these potential savings through a first-order analysis based on real cellular traffic traces and information regarding base station locations in a part of Manchester, United Kingdom. We also discuss a number of open issues pertinent to implementing such energy-efficient dynamic base station operation schemes, such as various approaches to ensure coverage, and interoperator coordination. View full abstract»

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  • Power consumption in telecommunication networks: overview and reduction strategies

    Publication Year: 2011 , Page(s): 62 - 69
    Cited by:  Papers (33)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (232 KB) |  | HTML iconHTML  

    One of the main challenges for the future of information and communication technologies is reduction of the power consumption in telecommunication networks. The key consumers are the home gateways at the customer premises for fixed line access technologies and the base stations for wireless access technologies. However, with increasing bit rates, the share of the core networks could become significant as well. In this article we characterize the power consumption in the different types of networks and discuss strategies to reduce the power consumption. View full abstract»

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  • Energy consumption in wired and wireless access networks

    Publication Year: 2011 , Page(s): 70 - 77
    Cited by:  Papers (27)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (265 KB) |  | HTML iconHTML  

    Energy consumption is becoming an increasingly important issue throughout the community. For network operators in particular it is a concern as networks expand to deliver increasing traffic levels to increasing numbers of customers. The majority of the energy used by the Internet today is consumed in the access network, and this will continue to be the case for the short-to-mid- term future. Access technologies should thus be a prime focus for energy use mitigation. In this article, we present a detailed analysis of energy consumption in current and future access networks. We present the energy consumption of DSL, HFC networks, passive optical networks, fiber to the node, point-to-point optical systems, UMTS (W-CDMA), and WiMAX. Optical access networks are the most energy efficient of the available access technologies. View full abstract»

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  • Putting the cart before the horse: merging traffic for energy conservation

    Publication Year: 2011 , Page(s): 78 - 82
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (281 KB) |  | HTML iconHTML  

    Reducing energy consumption in the Internet has become an increasingly important goal recently. Previous work on reducing energy consumption has primarily looked at either changing link rates or putting interfaces to sleep. Due to the unpredictable nature of traffic, the energy savings achieved have been modest, do not scale, and incur losses and delay. This article proposes a different approach to the problem, which involves aggregating traffic from multiple input links prior to feeding them to the switch interfaces. The main results we obtain are that energy consumption, measured as fraction of interfaces that are awake, scales linearly with load for all loads and the algorithms are fully deterministic yielding zero packet loss. View full abstract»

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  • On the design of green reconfigurable router toward energy efficient internet

    Publication Year: 2011 , Page(s): 83 - 87
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (193 KB) |  | HTML iconHTML  

    A great deal of research has contributed to the energy efficiency of battery-operated devices in the area of wireless communications, but recently, the energy consumption of the underlying network infrastructure has started to attract more attention as people have become aware of the significant fraction of energy consumed by the Internet of all the energy we consume. We argue that the architecture of routers in constructing the Internet can be improved so as to fully utilize chances to save energy related to transmission equipment. A green reconfigurable router is thus presented for this purpose. View full abstract»

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  • Radio communications: components, systems, and networks [Guest editorial]

    Publication Year: 2011 , Page(s): 88
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  • Carrier aggregation for LTE-advanced: functionality and performance aspects

    Publication Year: 2011 , Page(s): 89 - 95
    Cited by:  Papers (38)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (644 KB) |  | HTML iconHTML  

    Carrier aggregation is one of the key features for LTE-Advanced. By means of CA, users gain access to a total bandwidth of up to 100 MHz in order to meet the IMT-Advanced requirements. The system bandwidth may be contiguous, or composed of several non-contiguous bandwidth chunks that are aggregated. This article presents a summary of the supported CA scenarios as well as an overview of the CA functionality for LTE-Advanced with special emphasis on the basic concept, control mechanisms, and performance aspects. The discussion includes definitions of the new terms primary cell (PCell) and secondary cell (SCell), mechanisms for activation and deactivation of CCs, and the new cross-CC scheduling functionality for improved control channel optimizations. We also demonstrate how CA can be used as an enabler for simple yet effective frequency domain interference management schemes. In particular, interference management is anticipated to provide significant gains in heterogeneous networks, envisioning intrinsically uncoordinated deployments of home base stations. View full abstract»

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  • Integrated solutions for testing wireless communication systems

    Publication Year: 2011 , Page(s): 96 - 100
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1072 KB) |  | HTML iconHTML  

    Wireless communications standards have been evolving rapidly to increase system performance, which poses significant challenges on developing complex test and verification algorithms and schemes early on in a product's life cycle. An integrated test solution answers these challenges through a scalable and reconfigurable integrated test system that is coordinated via integrated core software. This solution not only improves a product's time to market, but is also more efficient from production and economic points of view. View full abstract»

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  • An introduction to millimeter-wave mobile broadband systems

    Publication Year: 2011 , Page(s): 101 - 107
    Cited by:  Papers (82)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (220 KB) |  | HTML iconHTML  

    Almost all mobile communication systems today use spectrum in the range of 300 MHz-3 GHz. In this article, we reason why the wireless community should start looking at the 3-300 GHz spectrum for mobile broadband applications. We discuss propagation and device technology challenges associated with this band as well as its unique advantages for mobile communication. We introduce a millimeter-wave mobile broadband (MMB) system as a candidate next generation mobile communication system. We demonstrate the feasibility for MMB to achieve gigabit-per-second data rates at a distance up to 1 km in an urban mobile environment. A few key concepts in MMB network architecture such as the MMB base station grid, MMB interBS backhaul link, and a hybrid MMB + 4G system are described. We also discuss beamforming techniques and the frame structure of the MMB air interface. View full abstract»

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  • Spectrally agile multicarrier waveforms for opportunistic wireless access

    Publication Year: 2011 , Page(s): 108 - 115
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (765 KB) |  | HTML iconHTML  

    Multicarrier modulation has been employed in numerous modern wireless communications standards due to its ability in providing high data rates while simultaneously counteracting the effects of intersymbol interference due to multipath fading channels. In the recent years, multicarrier modulation is being investigated as a possible candidate data transmission scheme for achieving spectrally agile wireless access in scenarios where unlicensed users temporarily "borrow" unoccupied licensed frequency bands while minimizing interference with spectrally adjacent signals, i.e., opportunistic wireless access. Specifically, the divide-and-conquer data transmission approach employed by multicarrier modulation makes it an attractive option for realizing wireless communication systems that do not require a single continuous transmission frequency band. In this article, we present several multicarrier transmission solutions designed for efficiently achieving opportunistic wireless access. In particular, we shall investigate two types of spectrally-agile multicarrier modulation schemes, namely, non-contiguous orthogonal frequency-division multiplexing and non-contiguous nonorthogonal frequency-division multiplexing. The viability of these two techniques employed within an opportunistic wireless access scenario is assessed using actual spectrum measurement data, and a comparative study in terms of out-of-band interference mitigation as well as implementation complexity is provided. View full abstract»

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  • The latest in consumer communications, straight from the IEEE consumer communications and networking conference 2011 [Series editorial]

    Publication Year: 2011 , Page(s): 116 - 117
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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
Osman Gebizlioglu
Huawei Technologies