Now showing items 1-6 of 6

    • Accurate modeling of metamaterials with MLFMA 

      Ergül, Özgür; Ünal, Alper; Gürel, Levent (ESA Publications, 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.; Aktaş, Defne (IEEE, 2007-08)
      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 ...