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Wireless Communications, IEEE

Issue 2 • Date April 2012

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Displaying Results 1 - 17 of 17
  • IEEE Wireless Communications - Front cover

    Publication Year: 2012 , Page(s): c1
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  • Table of contents

    Publication Year: 2012 , Page(s): 1
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  • Introducing the new editor-in-chief

    Publication Year: 2012 , Page(s): 2 - 3
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  • Enabling small cell deployment with HetNet

    Publication Year: 2012 , Page(s): 4 - 5
    Cited by:  Papers (11)
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  • Spectrum policy issues in wireless education programs

    Publication Year: 2012 , Page(s): 6 - 7
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  • User cooperation in wireless networks

    Publication Year: 2012 , Page(s): 8 - 9
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  • Cooperation in wireless communication networks

    Publication Year: 2012 , Page(s): 10 - 20
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (243 KB) |  | HTML iconHTML  

    The concept of cooperation in wireless communication networks has drawn significant attention recently from both academia and industry as it can be effective in addressing the performance limitations of wireless networks due to user mobility and the scarcity of network resources. In this article, we aim to shed some light on potential benefits of such an approach and discuss its challenging issues. We focus on three cooperation scenarios, namely, cooperation to improve channel reliability through spatial diversity, cooperation to improve throughput through resource aggregation, and cooperation to achieve seamless service provision. Challenging issues which arise at different layers of the network protocol stack are discussed, with an emphasis on the medium access control, network, and transport layers. We also present some future research directions in this area. View full abstract»

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  • Cooperative communications for wireless networks: techniques and applications in LTE-advanced systems

    Publication Year: 2012
    Cited by:  Papers (24)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (299 KB) |  | HTML iconHTML  

    Cooperative communications enable efficient utilization of communication resources, by allowing nodes or terminals in a communication network to collaborate with each other in information transmission. It is a promising technique for future communication systems. In this article, we first survey cooperative communication schemes and discuss their advantages in improving system capacity and diversity. Following that, we examine the applications of cooperative relaying schemes in LTE-advanced systems. Specifically, we investigate two intra-cell coordinated multi-point schemes in LTE-advanced systems, and evaluate the performance of the schemes. It is shown that cooperative relaying leads to both network coverage extension and capacity expansion in LTE-advanced systems. Cooperative communications can significantly improve the system spectrum efficiency and performance. View full abstract»

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  • Secondary users cooperation in cognitive radio networks: balancing sensing accuracy and efficiency

    Publication Year: 2012 , Page(s): 30 - 37
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (248 KB) |  | HTML iconHTML  

    Cooperative spectrum sensing is a promising technique in cognitive radio networks by exploiting multi-user diversity to mitigate channel fading. Cooperative sensing is traditionally employed to improve the sensing accuracy while the sensing efficiency has been largely ignored. However, both sensing accuracy and efficiency have very significant impacts on the overall system performance. In this article, we first identify the fundamental trade-off between sensing accuracy and efficiency in spectrum sensing in cognitive radio networks. Then, we present several different cooperation mechanisms, including sequential, full-parallel, semi-parallel, synchronous, and asynchronous cooperative sensing schemes. The proposed cooperation mechanisms and the sensing accuracy-efficiency trade-off in these schemes are elaborated and analyzed with respect to a new performance metric achievable throughput, which simultaneously considers both transmission gain and sensing overhead. Illustrative results indicate that parallel and asynchronous cooperation strategies are able to achieve much higher performance, compared to existing and traditional cooperative spectrum sensing in cognitive radio networks. View full abstract»

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  • Resource allocation for wireless cooperative networks: a unified cooperative bargaining game theoretic framework

    Publication Year: 2012 , Page(s): 38 - 43
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (227 KB) |  | HTML iconHTML  

    Wireless cooperative communications require appropriate spectrum allocation (SA) and power allocation (PA) between the source and relay nodes. In this article, we first present an overview of the game theoretic incentive mechanisms for stimulating cooperation among selfish user nodes. Thereafter, the related issues on user payoff function design and the corresponding SA and PA strategies are discussed. To distribute the collective capacity gains among the cooperative nodes efficiently, we analyze and then formulate multiple resource allocation problems including SA, PA, and simultaneous multiresource allocation (SMRA) problems into the unified cooperative bargaining game, and the Nash bargaining solution method is utilized to solve these problems. Moreover, we propose to decompose the SMRA game into multiple single-resource allocation games and then resolve them sequentially. Finally, various game results are compared with a view to highlight that the decomposed SMRA game could obtain a good trade-off between computational complexity and system efficiency. View full abstract»

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  • Game theory in cooperative communications

    Publication Year: 2012 , Page(s): 44 - 49
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (205 KB) |  | HTML iconHTML  

    Cooperative communication has great potential to improve the wireless channel capacity by exploiting the antennas on wireless devices for spatial diversity. However, applications of cooperative communication are barely seen in reality. A main obstacle blocking its wide application is the lack of incentives for wireless nodes to participate in cooperative communication. We first survey the existing game theoretic solutions for providing cooperation incentives in cooperative communications. We then discuss the challenges in applying game theory to cooperative communications. View full abstract»

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  • Evolutionary coalitional games: design and challenges in wireless networks

    Publication Year: 2012 , Page(s): 50 - 56
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (328 KB) |  | HTML iconHTML  

    The current state of the art of evolutionary coalitional game theory in wireless networking and communications is captured in this article, where solutions are discussed under their related applications. Fully distributed algorithms for global optima in network selection games are examined. Then the problem of dynamic network formation and evolutionary coalitional games in wireless networks are investigated. This article also points out the open research issues, new interests, and developments in this interdisciplinary field. View full abstract»

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  • Cooperative relaying in Wi-Fi networks with network coding

    Publication Year: 2012 , Page(s): 57 - 65
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (232 KB) |  | HTML iconHTML  

    Recently, network coding has emerged as a new cooperative technique for improving network throughputs over traditional routing techniques. Network coding allows intermediate nodes to combine packets using an algebraic function before forwarding. Selfless cooperation by the intermediate nodes is thus implicitly assumed in the network employing network coding. Such cooperation in principle should not happen for free but for mutual benefits shared by source-destination pairs and the cooperating intermediate nodes. Effective resource allocation techniques are thus required to efficiently utilize the limited network resources at the intermediate nodes. In this article, we propose one such effective buffer allocation algorithm, called buffer equalized opportunistic network coding (BE-ONC), to dynamically exploit buffer spaces at a relay node of a relay-based IEEE 802.11 network. The BE-ONC technique combines packets opportunistically based on dynamic buffer allocation at the relay. Through simulations, we illustrate that the proposed scheme improves over the classical packet scheduling schemes in terms of delay and successful packet delivery ratio in a cooperative relay-based Wi-Fi network. Our experimental results further confirm the potential benefits of BE-ONC in terms of packet delivery ratio, when compared with first-in first-out scheduling at the relay node. The guidelines for extending our proposed scheme to a more general scenario, where more than two users are involved, and the relay is allowed to transmit its own packet, are also provided. View full abstract»

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  • A theoretical framework for optimal cooperative networking in multiradio multichannel wireless networks

    Publication Year: 2012 , Page(s): 66 - 73
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (255 KB) |  | HTML iconHTML  

    A wide range of next generation wireless networks are based on the multiradio multichannel (MR-MC) network model. A full exploration of the MR-MC wireless network capacity incurs challenging cooperative networking issues including transmission cooperation, resource allocation cooperation, and cross-layer protocol cooperation. In this article, rather than focus on protocol designs for specific cooperative networking issues, we present a generic theoretical framework that could guide the protocol or algorithm development to approach the maximum network capacity. Based on our multidimensional conflict graph (MDCG) tool, we could achieve a cross-layer linear programming framework to study the optimal cooperative networking in two complementary aspects: optimal network dimensioning and throughput-optimal control. While certain NP-hard computing issues hindered the MR-MC network optimization for a long time, the MDCG-based framework can readily generate simple polynomial and distributed algorithms with guaranteed capacity region. View full abstract»

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  • Topology control in mobile Ad Hoc networks with cooperative communications

    Publication Year: 2012 , Page(s): 74 - 79
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (216 KB) |  | HTML iconHTML  

    Cooperative communication has received tremendous interest for wireless networks. Most existing works on cooperative communications are focused on link-level physical layer issues. Consequently, the impacts of cooperative communications on network-level upper layer issues, such as topology control, routing and network capacity, are largely ignored. In this article, we propose a Capacity-Optimized Cooperative (COCO) topology control scheme to improve the network capacity in MANETs by jointly considering both upper layer network capacity and physical layer cooperative communications. Through simulations, we show that physical layer cooperative communications have significant impacts on the network capacity, and the proposed topology control scheme can substantially improve the network capacity in MANETs with cooperative communications. View full abstract»

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  • Video summary delivery over cooperative wireless networks

    Publication Year: 2012 , Page(s): 80 - 87
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (833 KB) |  | HTML iconHTML  

    This article addresses cooperative video summary delivery over wireless networks which inherits advantages from both cooperative communication and video summarization. In this work, a novel decode-process-and-forward (DPF) scheme is proposed for video summary transmission, where a relay node with video processing capability is involved to generate a concise version of the summary frame, called summary of summary (SoS). The SoS information is effectively consumed by the destination side to enhance its error concealment capability, leading to an improved video reconstruction quality. This article proposes a generic crosslayer optimization framework for cooperative video summary transmission, which jointly considers the source coding, relay processing parameters, power allocation, and error concealment strategy to achieve the best video quality. The problem is solved by using Lagrangian relaxation and dynamic programming. Experimental results show that the proposed scheme significantly outperforms existing cooperative and non-cooperative transmission schemes. View full abstract»

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  • Mobility management of unicast services for wireless access in vehicular environments

    Publication Year: 2012 , Page(s): 88 - 95
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1223 KB) |  | HTML iconHTML  

    Wireless Access in Vehicular Environments (WAVE) provides seamless and interoperable services for vehicles. In WAVE, the WAVE Short Message Protocol (WSMP) provides broadcast services but does not define unicast/multicast services that require mobility management to track the locations of the vehicles. To resolve this issue, this article proposes a location estimation-based mobility management mechanism by utilizing positioning systems (e.g., GPS) for a WAVE system deployed in highway environment with a large volume of high-speed vehicles. Performance study indicates that under the same paging cost, our approach can reduce 40-90 percent of the network traffic as compared with the traditional cellular mobility management approach. View full abstract»

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Aims & Scope

IEEE Wireless Communications Magazine deals with all technical and policy issues related to personalization, location-independent communications in all media.

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Meet Our Editors

Editor-in-Chief
Hsiao-Hwa Chen
Cheng Kung University, Taiwan