Wireless Communications and Mobile Computing

Cover image for Vol. 14 Issue 4

March 2014

Volume 14, Issue 4

Pages i–ii, 409–496

  1. Issue Information

    1. Top of page
    2. Issue Information
    3. Research Articles
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  2. Research Articles

    1. Top of page
    2. Issue Information
    3. Research Articles
    1. On the need for dynamic downlink intercell interference coordination for realistic Long Term Evolution deployments (pages 409–434)

      David González G, Mario García-Lozano, Silvia Ruiz and Joan Olmos

      Version of Record online: 24 FEB 2012 | DOI: 10.1002/wcm.2191

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      Intercell interference coordination is without a doubt one of the main enablers of modern cellular system. In this article, the performance of such techniques in the context of realistic Long Term Evolution-based deployments is investigated. Results indicate that by means of dynamic coordination, significant gains can be achieved, and hence, the need for low-complex and feasible solutions is identified as a promising research topic.

    2. Providing throughput guarantees in heterogeneous wireless mesh networks (pages 435–449)

      Antonio de la Oliva, Albert Banchs, Pablo Serrano and Frank A. Zdarsky

      Version of Record online: 31 JAN 2012 | DOI: 10.1002/wcm.2192

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      This paper proposes to provide throughput guarantees in heterogeneous wireless mesh networks by jointly optimizing routing and Medium Access Control configuration. Our solution is based on the notion of linearized capacity region, which provides a technology-independent way of representing the capacity of a wireless link.

    3. Deriving the distributions for the numbers of short message arrivals (pages 450–459)

      Hui-Nien Hung, Yi-Bing Lin and Chao-Liang Luo

      Version of Record online: 6 FEB 2012 | DOI: 10.1002/wcm.2194

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      This paper derives the short message service (SMS) arrival number distributions of various traffic types and observed days. Our approach fits each SMS arrival number distribution by three cubic polynomial functions that can accurately capture the SMS behaviors. On the basis of the SMS arrival number distributions derived from our model, the mobile operators have better understanding about the volumes of short messages in different times and days, which can be used to design more flexible short message charging rates.

    4. Spectrum sharing in frequency-selective unlicensed bands: a game theoretic approach (pages 460–471)

      Yunjian Xu, Wei Chen and Zhigang Cao

      Version of Record online: 29 JAN 2012 | DOI: 10.1002/wcm.2196

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      For multiple systems cooperating on frequency-selective (FS) interference channels (ICs), we study an optimal power allocation strategy, which allows transmission power density to vary within one subcarrier. By showing the duality of FS and the parallel frequency-flat (FF) channels, we compute the achievable rate region of the proposed strategy when systems cooperate with each other. For multiple selfish systems on FS ICs, we construct a game-theoretic framework that enables us to apply existing protocols designed for frequency-flat ICs to FS scenarios.

    5. Joint evolutionary spectrum and autoregressive-based approach to modeling non-stationary flat fading channels (pages 472–486)

      Qing Wang, Dapeng Wu and Pingyi Fan

      Version of Record online: 10 FEB 2012 | DOI: 10.1002/wcm.2201

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      Recently, we proposed a new approach to modeling non-stationary fading channels, based on the theory of evolutionary spectrum (ES). In this paper, we develop a time-varying autoregressive (AR) model for a non-stationary flat fading channel; specifically, we develop a method to determine the time-varying coefficients of the AR channel model, given the ES of a non-stationary process. Furthermore, with the ES theory, we develop a trace-driven time-varying AR channel simulator to generate a non-stationary flat fading process. Simulation results show that the ES of the channel gain process produced by our joint ES-and-AR-based channel model agrees well with the user-specified ES, indicating the accuracy of our joint ES-and-AR-based channel model.

    6. Power allocation and relay selection for AF two-path successive relaying networks (pages 487–496)

      Yang Zhang, Lihua Pang and Jiandong Li

      Version of Record online: 10 JAN 2013 | DOI: 10.1002/wcm.2344

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      We developed the power allocation and relay selection techniques for amplify-and-forward two-path successive relaying networks with two scenes: when the direct link exists or not. We show that with the same channel conditions, more power should be assigned to the source compared with the results in conventional one-path relaying networks. Relay selection can be implemented by selecting the relay with which a maximum received signal-to-noise ratio will be achieved and broadcasting the index of the relay as well as the normalized power value.