Electrical - Electronic Engineering / Elektrik - Elektronik Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/11

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  • Conference Object
    Kentsel Alanlarda Gölgeleme Etki̇sinin Benzetim ve Anali̇zi̇
    (Institute of Electrical and Electronics Engineers Inc., 2011) Sancaklı, Sibel; Özen, Serdar
    A low complexity correlation model for the received signal in shadowing in a mobile radio system was proposed. The predicted autocorrelation function is obtained via a site-specific radio propagation tool which uses ray tracing. L2-norm method is used to fit the proposed model to the experimental results and the model parameters of this method is acquired via numerical optimization. The predicted results are compared with the other models in the literature and we report that our model has lower computational complexity and more suitable for hardware emulator implementations than existing models. © 2011 IEEE.
  • Article
    Citation - WoS: 1
    Citation - Scopus: 2
    Joint Effect of Data Rate and Routing Strategy on Energy-Efficiency of Ieee 802.11 Dcf Based Multi-Hop Wireless Networks Under Hidden Terminal Existence
    (Elsevier Ltd., 2015) Aydoğdu, Canan; Sancaklı, Sibel
    We investigate the joint effect of data rate and routing strategy on energy-efficiency of multi-hop wireless networks incorporating a comprehensive behavior of the IEEE 802.11 DCF under the presence of hidden terminals. Two basic routing strategies, direct transmission versus multi-hop routing, are considered over a large range of traffic loads. The goal of this study is to layout guidelines for a cross-layer energy-efficient rate adaptation algorithm, which takes medium access control and network layer dynamics into account together with the hidden terminal effect. Our results show that, for the low-power wireless IEEE 802.11g standard considered in this article, the highest data rate consumes the least power in multi-hop wireless networks when hidden terminals mostly constitute the reason of collisions. In case of channel impairments, adapting the rate jointly with the routing strategy can save the energy consumed per bit by up to 250% under moderate traffic loads and much more under heavy traffic loads. © 2015 Elsevier B.V. All rights reserved.