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Ergodic Sum Rate Maximization for Underlay Spectrum Sharing with Heterogeneous Traffic

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Abstract

A radio resource allocation framework is proposed for underlay spectrum sharing. The ergodic capacity maximization problem in orthogonal frequency division multiple access-based network on point to multi point transmission is formulated and solved. Heterogeneous traffic is also considered in which two types of traffic is assumed:streaming traffic which has strict delay requirements, andelastic traffic with flexible delay requirements. Considering the effect of channel state information (CSI) imperfection in the evaluation of the secondary users’ expected rate, we further assume that the estimated CSI between the secondary users and secondary base station (secondary channel) is not perfect. Moreover three different cases are considered depending on the availability of the CSI between the secondary base station and the primary receivers (interference channel). Using simulations, we evaluate the impact of streaming traffic and imperfect CSI on the sum capacity of the secondary elastic users for different values of parameter systems.

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Author information

Authors and Affiliations

  1. Department of Electrical Engineering, East Tehran Branch, Islamic Azad University, Tehran, Iran

    Mina Dashti

  2. Electrical and Computer Engineering Department, Tarbiat Modares University, Tehran, Iran

    Paeiz Azmi

  3. School of Electronic and Electrical Engineering, University of Leeds, Leeds, UK

    Keivan Navaie

  4. Department of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran

    S. Mohammad Razavizadeh

Authors
  1. Mina Dashti

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  2. Paeiz Azmi

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  3. Keivan Navaie

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  4. S. Mohammad Razavizadeh

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Corresponding author

Correspondence toMina Dashti.

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