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Communications and Networks, Journal of

Issue 2 • Date April 2009

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Displaying Results 1 - 19 of 19
  • [Front cover]

    Publication Year: 2009 , Page(s): c1
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  • Inside front cover

    Publication Year: 2009 , Page(s): c2
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  • Cognitive radio: A path in the evolution of public wireless networks

    Publication Year: 2009 , Page(s): 99 - 103
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  • Cognitive radio based spectrum sharing: Evaluating channel availability via traffic pattern prediction

    Publication Year: 2009 , Page(s): 104 - 114
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1567 KB) |  | HTML iconHTML  

    In this paper, a technique is proposed that enables secondary users to evaluate channel availability in cognitive radio networks. Here, secondary users estimate the utilization of channels via predicting the traffic pattern of primary user, and select a proper channel for radio transmission. The proposed technique reduces the channel switching rate of secondary users (the rate of switching from on... View full abstract»

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  • A novel cooperative spectrum sensing algorithm in cognitive radio systems

    Publication Year: 2009 , Page(s): 115 - 121
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1242 KB) |  | HTML iconHTML  

    In cognitive radio (CR) systems, cognitive users can use the frequency bands when the primary users are not present. Hence, reliable detection of available spectrum is foundation of cognitive radio technology. To ensure unimpaired operation of primary users, cooperative spectrum sensing is needed. To reduce the network overhead of cooperative spectrum sensing, a novel cooperative spectrum sensing ... View full abstract»

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  • Enhanced robust cooperative spectrum sensing in cognitive radio

    Publication Year: 2009 , Page(s): 122 - 133
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (931 KB) |  | HTML iconHTML  

    As wireless spectrum resources become more scarce while some portions of frequency bands suffer from low utilization, the design of cognitive radio (CR) has recently been urged, which allows opportunistic usage of licensed bands for secondary users without interference with primary users. Spectrum sensing is fundamental for a secondary user to find a specific available spectrum hole. Cooperative s... View full abstract»

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  • Opportunistic spectrum access based on a constrained multi-armed bandit formulation

    Publication Year: 2009 , Page(s): 134 - 147
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2970 KB) |  | HTML iconHTML  

    Tracking and exploiting instantaneous spectrum opportunities are fundamental challenges in opportunistic spectrum access (OSA) in presence of the bursty traffic of primary users and the limited spectrum sensing capability of secondary users. In order to take advantage of the history of spectrum sensing and access decisions, a sequential decision framework is widely used to design optimal policies.... View full abstract»

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  • Throughput and delay optimal scheduling in cognitive radio networks under interference temperature constraints

    Publication Year: 2009 , Page(s): 148 - 156
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (996 KB) |  | HTML iconHTML  

    The fixed spectrum assignment policy in today's wireless networks leads to inefficient spectrum usage. Cognitive radio network is a new communication paradigm that enables the unlicensed users to opportunistically use the spatio-temporally unoccupied portions of the spectrum, and hence realizing a dynamic spectrum access (DSA) methodology. Interference temperature model proposed by Federal Communi... View full abstract»

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  • Large-scale joint rate and power allocation algorithm combined with admission control in cognitive radio networks

    Publication Year: 2009 , Page(s): 157 - 165
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (782 KB) |  | HTML iconHTML  

    In this paper, we investigate a dynamic spectrum sharing problem for the centralized uplink cognitive radio networks using orthogonal frequency division multiple access. We formulate a large-scale joint rate and power allocation as an optimization problem under quality of service constraint for secondary users and interference constraint for primary users. We also suggest admission control to find... View full abstract»

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  • Distributed power and rate control for cognitive radio networks

    Publication Year: 2009 , Page(s): 166 - 174
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (886 KB) |  | HTML iconHTML  

    In this paper, a distributed power and end-to-end rate control algorithm is proposed in the presence of licensed users. By Lagrangian duality theory, the optimal power and rate control solution is given for the unlicensed users while satisfying the interference temperature limits to licensed users. It is obtained that transmitting with either 0 or the maximum node power is the optimal scheme. The ... View full abstract»

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  • RawPEACH: Multiband CSMA/CA-based cognitive radio networks

    Publication Year: 2009 , Page(s): 175 - 186
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1651 KB) |  | HTML iconHTML  

    A new medium access control (MAC) scheme embedding physical channels into multiband carrier sense multiple access/collision avoidance (CSMA/CA) networks is proposed to provide strict quality of service (QoS) guarantee to high priority users. In the proposed scheme, two priority classes of users, primary and secondary users, are supported. For primary users physical channels are provided to ensure ... View full abstract»

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  • Ad-hoc behavior in opportunistic radio

    Publication Year: 2009 , Page(s): 187 - 195
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2063 KB) |  | HTML iconHTML  

    The application of mathematical analysis to the study of wireless ad hoc networks has met with limited success due to the complexity of mobility, traffic models and the dynamic topology. A scenario based universal mobile telecommunications system (UMTS) time division duplex (TDD) opportunistic cellular system with an ad hoc behaviour that operates over UMTS frequency division duplex (FDD) licensed... View full abstract»

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  • High capacity relay protocols for wireless networks

    Publication Year: 2009 , Page(s): 196 - 206
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1584 KB) |  | HTML iconHTML  

    Over the last five years, relaying or multihop techniques have been intensively researched as means for potentially improving link performance of wireless networks. However, the data rates of relays are often limited because they cannot transmit and receive on the same frequency simultaneously. This limitation has come to the attention of researchers, and recently a number of relay techniques have... View full abstract»

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  • Call for papers

    Publication Year: 2009 , Page(s): 1
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  • Call for papers

    Publication Year: 2009 , Page(s): 1
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  • [Advertisement]

    Publication Year: 2009 , Page(s): 1
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  • Copyright transfer form

    Publication Year: 2009 , Page(s): 1
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  • Journal of Communications and Networks (JCN)

    Publication Year: 2009 , Page(s): c3
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  • Back cover

    Publication Year: 2009 , Page(s): c4
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Aims & Scope

The Journal of Communications and Networks is published six times per year, and is committed to publishing high-quality papers that advance the state-of-the-art and practical applications of communications and information networks.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
H. Vincent Poor
Princeton University