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Πλοήγηση ανά Θέμα "Channel state information"

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    • Downlink mobile OFDMA resource allocation with minimum user rate requests 

      Stefanatos, S.; Papathanasiou, C.; Dimitriou, N. (2009)
      The problem of resource allocation (RA) in a downlink OFDMA system with minimum user rate requests is examined under the realistic scenario of partial (imperfect) channel state information (CSI) at the base station. The ...

    • Downlink transmission optimization and statistical feedback strategies in a multi-user IEEE 802.16m system 

      Papathanasiou, C.; Dimitriou, N.; Tassiulas, L. (2009)
      A multi-user MIMO/OFDMA system for the next generation Broadband Wireless Access (BWA) networks is studied, in which the Base Station (BS) has only knowledge of the statistics of the channel. A combination of MIMO, OFDMA ...

    • An efficient probing mechanism for next generation mobile broadband systems 

      Gkatzikis, L.; Tryfonopoulos, T.; Koutsopoulos, I. (2012)
      Opportunistic scheduling exploits multiuser diversity for improving the performance of wireless systems. However, it requires instantaneous channel state information (CSI) to be available at the transmitter side. Since ...

    • Energy aware buffer aided cooperative relay selection 

      Hadef, M.; Apostolaras, A.; O'Reillys, J.; Mourad, A.; Mouhouche, B.; Koutsopoulos, I.; Korakis, T.; Tassiulas, L. (2014)
      In this paper we evaluate an energy-aware relay selection mechanism which exploits channel state information and the availability of buffers at relays to perform flexible relaying based on a backpressure-driven optimization ...

    • Energy aware buffer aided cooperative relay selection 

      Hadef M., Apostolaras A., O'Reillys J., Mourad A., Mouhouche B., Koutsopoulos I., Korakis T., Tassiulas L. (2016)
      In this paper we evaluate an energy-aware relay selection mechanism which exploits channel state information and the availability of buffers at relays to perform flexible relaying based on a backpressure-driven optimization ...

    • Feedback-Based SSK Modulation: Constellation Design and Performance Results 

      Singh U., Bhatnagar M.R., Tsiftsis T.A. (2020)
      In this article, we propose a limited feedback-based space-shift keying (SSK) modulation scheme where transmitter (Tx) obtains partial channel state information (CSI) via a feedback link from receiver (Rx). More specifically, ...

    • On the use of distributed directive antenna arrays in mobile OFDMA networks 

      Papathanasiou, C.; Dimitriou, N.; Samios, T.; Tassiulas, L. (2011)
      Distributed Omni Antenna Systems (OASs) have been proposed to increase the capacity of Broadband Wireless Access (BWA) systems. We investigate the extension of such systems by employing distributed Directive Antenna Arrays ...