Now showing items 1-8 of 8

    • Challenges and some new directions in channel coding 

      Arikan, E.; Ul Hassan, N.; Lentmaier, M.; Montorsi, G.; Sayir, J. (Korean Institute of Communication Sciences, 2015)
      Three areas of ongoing research in channel coding are surveyed, and recent developments are presented in each area: Spatially coupled low-density parity-check (LDPC) codes, nonbinary LDPC codes, and polar coding.
    • Code design for binary energy harvesting channel 

      Dabirnia M.; Duman, T. M. (Institute of Electrical and Electronics Engineers Inc., 2017)
      We consider a binary energy harvesting communication system with a finite battery transmitter over a noisy channel, and design explicit and implementable codes based on concatenation of a nonlinear trellis code (NLTC) with ...
    • Connectivity analysis of an AUV network with OFDM based communications 

      Bereketli, A.; Tümçakir, M.; Yazgi, I.; Yeni, B.; Koseoglu, M.; Duman, T. M. (Institute of Electrical and Electronics Engineers Inc., 2017)
      Autonomous underwater vehicle (AUV) networks play a crucial role in tactical, commercial, and scientific applications, where reliable and robust communication protocols are needed due to the challenging characteristics of ...
    • Energy-price-driven query processing in multi-center web search engines 

      Kayaaslan, E.; Cambazoglu, B. B.; Blanco, R.; Junqueira, F. P.; Aykanat, C. (2011)
      Concurrently processing thousands of web queries, each with a response time under a fraction of a second, necessitates maintaining and operating massive data centers. For large-scale web search engines, this translates ...
    • Implementing the Han-Kobayashi scheme using low density parity check codes over Gaussian interference channels 

      Sharifi S.; Tanc, A. K.; Duman, T. M. (Institute of Electrical and Electronics Engineers Inc., 2015)
      We focus on Gaussian interference channels (GICs) and study the Han-Kobayashi coding strategy for the two-user case with the objective of designing implementable (explicit) channel codes. Specifically, low-density parity-check ...
    • Ionospheric total electron content estimation using IONOLAB method 

      Nayir H.; Arikan F.; Erol, C.B.; Arikan, O. (2007)
      Ionosphere which is an important atmospheric layer for HF and satellite communications, can be investigated through Total Electron Content (TEC). Global Positioning System provides cost-effective means for TEC estimation. ...
    • Space weather activities of IONOLAB group using TNPGN GPS Network 

      Aktug, B.; Lenk O.; Kurt, M.; Parmaksiz, E.; Ozdemir, S.; Arikan F.; Sezen, U.; Toker, C.; Arikan, O. (2011)
      Characterization and constant monitoring of variability of the ionosphere is of utmost importance for the performance improvement of HF communication, Satellite communication, navigation and guidance systems, Low Earth ...
    • Synthetic TEC mapping with ordinary and universal kriging 

      Sayin I.; Arikan F.; Arikan, O. (2007)
      Spatiotemporal variations in the ionosphere affects the HF and satellite communications and navigation systems. Total Electron Content (TEC) is an important parameter since it can be used to analyze the spatial and temporal ...