Browsing by Keywords "Wireless networks"

Now showing items 1-15 of 15

    • Bluetooth or 802.15.4 technologies to optimise lifetime of wireless sensor networks: Numerical comparison under a common framework 

      Buratti, C.; Korpeoglu I.; Karasan, E.; Verdone, R. (2008)
      This paper aims at comparing through simulations the network lifetime of a wireless sensor network using Bluetooth-enabled or IEEE802.15.4 compliant devices. The evaluation is performed under a common reference framework, ...

    • Channel estimation for MIMO-OFDM in fixed broadband wireless applications 

      Karakaya, B.; Çirpan H.A.; Panayirci, E. (2006)
      Systems employing multiple transmit and receive antennas, known as multiple input multiple output (MIMO) systems can be used with OFDM to improve the resistance to channel impairments. Thus the technologies of OFDM and ...

    • Computing localized power-efficient data aggregation trees for sensor networks 

      Tan, H. O.; Korpeoglu, I.; Stojmenovic, I. (Institute of Electrical and Electronics Engineers, 2011)
      We propose localized, self organizing, robust, and energy-efficient data aggregation tree approaches for sensor networks, which we call Localized Power-Efficient Data Aggregation Protocols (L-PEDAPs). They are based on ...

    • Interference mitigation and awareness for improved reliability 

      Arslan, H.; Yarkan S.; Şahin, M. E.; Gezici, Sinan (Cambridge University Press, 2011)
      Wireless systems are commonly affected by interference from various sources. For example, a number of users that operate in the same wireless network can result in multiple-access interference (MAI). In addition, for ...

    • A non-atochastic learning approach to energy efficient mobility management 

      Shen, C.; Tekin, C.; Van Der Schaar, M. (Institute of Electrical and Electronics Engineers Inc., 2016)
      Energy efficient mobility management is an important problem in modern wireless networks with heterogeneous cell sizes and increased nodes densities. We show that optimization-based mobility protocols cannot achieve long-Term ...

    • An overview of physical Layer security with finite-alphabet signaling 

      Aghdam, S. R.; Nooraiepour, A.; Duman, T. M. (Institute of Electrical and Electronics Engineers, 2018)
      Providing secure communications over the physical layer with the objective of achieving secrecy without requiring a secret key has been receiving growing attention within the past decade. The vast majority of the existing ...

    • A peer-to-peer file search and download protocol for wireless ad-hoc networks 

      Sözer, H.; Tekkalmaz, M.; Korpeoglu, I. (Elsevier BV, 2009-01)
      Deployment of traditional peer-to-peer file sharing systems on a wireless ad-hoc network introduces several challenges. Information and workload distribution as well as routing are major problems for members of a wireless ...

    • Performance modeling and analysis of the interplay among Tcp, active queue management and wireless link adaptation 

      Öztürk, Onur (Bilkent University, 2015-09)
      We propose a novel workload-dependent queuing model of a wireless router link which employs active queue management and is offered with a number of persistent TCP flows. As opposed to existing work that focus only on the ...

    • Power-source-aware backbone routing in wireless sensor networks 

      Tekkalmaz, Metin; Körpeoğlu, İbrahim (IEEE, 2010-11)
      Due to the limited energy-source and mostly unattended nature of the wireless sensor networks, efficient use of energy has a critical importance on the lifetime of the applications accomplished by such networks. Although ...

    • Routing in delay tolerant networks with periodic connections 

      Mergenci, C.; Korpeoglu, I. (SpringerOpen, 2015)
      In delay tolerant networks (DTNs), the network may not be fully connected at any instant of time, but connections occurring between nodes at different times make the network connected through the entire time continuum. In ...

    • Sequential churn prediction and analysis of cellular network users-A multi-class, multi-label perspective 

      Khan, F.; Kozat, S. S. (Institute of Electrical and Electronics Engineers Inc., 2017)
      We investigate the problem of churn detection and prediction using sequential cellular network data. We introduce a cleaning and preprocessing of the dataset that makes it suitable for the analysis. We draw a comparison ...

    • Static positioning using UWB range measurements 

      Gholami, M.R.; Ström, E.G.; Sottile F.; Dardari, D.; Conti, A.; Gezici, S.; Rydström, M.; Spirito, M.A. (2010)
      The performance of several existing and partly new algorithms for positioning of sensor node based on distance estimate is compared when the distance estimates are obtained from a measurement campaign. The distance estimates ...

    • Throughput modeling of single hop CSMA networks with non-negligible propagation delay 

      Koseoglu, M.; Karasan, E. (IEEE, 2013)
      We analyze the performance of the CSMA protocol under propagation delays that are comparable with packet transmission times. We propose a semi-Markov model for the 2-node CSMA channel. For the 2-node case, the capacity ...

    • A two-level temporal fair scheduler for multi-cell wireless networks 

      Shahsavari, S.; Akar, N. (Department of Electrical and Electronics Engineers, 2015)
      We propose a two-level scheduler for a frequency reuse-1 multi-cell wireless network satisfying inter-and intra-cell weighted temporal fairness constraints. As opposed to hard partitioning of the entire frequency band to ...

    • Wireless ATA: A new data 

      Ozler, S.; Korpeoglu I. (2005)
      This paper introduces a new data transport architecture and protocol for storage that is implemented on wireless devices and that can be accessed through a short-range wireless access technology such as Bluetooth or 802.11. ...