Exploració per autor "Lema, Maria A."

Ara es mostren els items 1-8 de 8

    • Adapting fractional frequency reuse to realistic OFDMA cellular networks 

      González González, David; García Lozano, Mario; Ruiz Boqué, Sílvia; Lema, Maria A.; Lee, Dong Seop (2013)
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      Effective intercell interference (ICI) mitigation has been identified as a key challenge for emerging OFDMA cellular technologies such as Long Term Evolution (LTE). In order to address this issue, mobile operators have ...

    • Admission control in LTE uplink systems with sounding reference signals based channel state indicator 

      Lema, Maria A.; Ramon Ferran, Sergi; García Lozano, Mario; Ruiz Boqué, Sílvia; Olmos Bonafé, Juan José (2012)
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      This article focuses on the investigation of the Admission Control techniques in order to assure Quality of Service (QoS) in Long Term Evolution (LTE) systems. So as to estimate the users bandwidth requirement, Sounding ...

    • Improved scheduling decisions for LTE-A uplink based on MPR information 

      Lema, Maria A.; García Lozano, Mario; Ruiz Boqué, Sílvia; Olmos Bonafé, Juan José (2013)
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      Advanced (LTE-A) allows for non-contiguous resource allocation in the uplink. The aim is to increase the spectral efficiency by exploiting users’ frequency diversity gain. This feature implies that clustered-DFT-S-OFDM must ...

    • LTE UL power control evaluation in a system level simulator for synthetic and realistic scenarios 

      Lema, Maria A.; García Lozano, Mario; Ruiz Boqué, Sílvia; Olmos Bonafé, Juan José; Pérez Díaz de Cerio, David (2011)
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      The research involved in this study comprises the analysis of the impact of the power control algorithm and its performance in the system level. Following our work in TD 01040, the LTE system level simulator has been ...

    • Metaheuristic proposal to minimize self-interference in single frequency networks 

      García Lozano, Mario; Ruiz Boqué, Sílvia; Lema, Maria A.; Torras, Evelyn; Olmos Bonafé, Juan José; Minerva, Flaminio (2010-06-02)
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    • Multiobjective optimization of fractional frequency reuse for irregular OFDMA macrocellular deployments 

      González González, David; García Lozano, Mario; Ruiz Boqué, Sílvia; Lema, Maria A.; Lee, Dong Seop (2015-06)
      Article
      Accés obert
      Interference mitigation has been identified as a key challenge for emerging cellular technologies based on Orthogonal Frequency Division Multiple Access, such as Long Term Evolution. In this context, static intercell ...

    • Sounding reference signals management for CSI improvement in LTE uplink with carrier aggregation 

      Lema, Maria A.; García Lozano, Mario; Ruiz Boqué, Sílvia (2014)
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      To assure a good channel state information (CSI) in the uplink users need to send sounding reference signals along the entire bandwidth. This task is challenging in a Carrier Aggregation framework, as the time period ...

    • Uplink system and link level simulation of 3GPP-LTE Rel. 8 

      Lema, Maria A.; García Lozano, Mario; Olmos Bonafé, Juan José; Ruiz Boqué, Sílvia (2011)
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      3GPP LTE is the evolution of UMTS which will make possible to deliver next generation high quality multimedia services [1]. In LTE, Single Carrier Frequency Division Multiple Access (SC-FDMA) has been selected for the ...