Now showing items 1-6 of 6

    • Accurate modeling of metamaterials with MLFMA 

      Ergül Ö.; Ünal, A.; Gürel, L. (2006)
      Electromagnetic modelling of large metamaterial (MM) structures employing multilevel fast multipole algorithm (MLFMA) is reported. MMs are usually constructed by periodically embedding unit cells, such as split-ring ...
    • Cooperative precoding and artificial noise design for security over interference channels 

      Özçelikkale, A.; Duman, T. M. (Institute of Electrical and Electronics Engineers Inc., 2015)
      We focus on linear precoding strategies as a physical layer technique for providing security in Gaussian interference channels. We consider an artificial noise aided scheme where transmitters may broadcast noise in addition ...
    • Downlink beamforming under individual SINR and per antenna power constraints 

      Yazarel, Y.K.; Aktas, D. (2007)
      In this paper we consider the problem of finding the optimum beamforming vectors for the downlink of a multiuser system, where there are individual signal to interference plus noise ratio (SINR) targets for each user. ...
    • 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 ...
    • On LDPC codes for Gaussian interference channels 

      Sharifi, S.; Tanç, A. K.; Duman, Tolga M. (IEEE, 2014)
      In this paper, we focus on the two-user Gaussian interference channel (GIC), and study the Han-Kobayashi (HK) coding/decoding strategy with the objective of designing low-density parity-check (LDPC) codes. A code optimization ...
    • Optimal filtering in fractional Fourier domains 

      Kutay, M. Alper; Onural, Levent; Özaktaş Haldun M.; Arıkan, Orhan (IEEE, 1995)
      The ordinary Fourier transform is suited best for analysis and processing of time-invariant signals and systems. When we are dealing with time-varying signals and systems, filtering in fractional Fourier domains might allow ...