Now showing items 1-20 of 44

    • Analysis of DF relay selection in massive MIMO systems with hardware ımpairments 

      Kazemi, M.; Mohammadi, A.; Duman, Tolga M. (IEEE, 2020)
      We consider a massive multiple-input multiple-output (m-MIMO) system in which a source communicates with a destination with the help of multiple single-antenna decode-and-forward (DF) relays. Employing optimal relay ...
    • Artificial-noise-aided secure transmission over finite-ınput ıntersymbol ınterference channels 

      Hanoğlu, Serdar; Aghdam, Sina Rezaei; Duman, Tolga M. (IEEE, 2018-06)
      We propose an artificial noise (AN) injection strategy for securing communication over finite-input intersymbol interference (lSI) channels. The technique relies on injection of colored noise whose power spectral density ...
    • Asymptotic analysis of contention resolution ALOHA with replica concatenation 

      Akyıldız, Talha; Demirhan, U.; Duman, Tolga M. (Institute of Electrical and Electronics Engineers Inc., 2019)
      In this paper, we present an asymptotic performance analysis of contention resolution ALOHA (CRA) on the collision channel for both regular and irregular repetition rates. In addition, we consider an improvement to CRA by ...
    • An asynchronous two-way relay system with full delay diversity in time-varying multipath environments 

      Salim, A.; Duman, Tolga M. (IEEE, 2015-02)
      We consider design of asynchronous OFDM-based diamond two-way-relay (DTWR) systems in time-varying frequency-selective (doubly-selective) fading channels such as underwater acoustic (UWA) channels. In a DTWR channel, two ...
    • Code design for binary energy harvesting channel 

      Dabirnia, Mehdi; Duman, Tolga M. (IEEE, 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 ...
    • Code design for discrete memoryless interference channels 

      Dabirnia, Mehdi; Tanc, A. K.; Sharifi S.; Duman, Tolga M. (Institute of Electrical and Electronics Engineers, 2018)
      We study the design of explicit and implementable codes for the two-user discrete memoryless interference channels (DMICs). We consider Han-Kobayashi (HK) type encoding where both public and private messages are used and ...
    • Coded caching with user grouping over wireless channels 

      Büşra, Tegin; Duman, Tolga M. (IEEE, 2020)
      We study coded caching over non-ergodic fading channels. As the multicast capacity of a broadcast channel is restricted by the user experiencing the worst channel conditions, we formulate an optimization problem to minimize ...
    • Coding for two-user energy harvesting interference channel 

      Dabirnia, Mehdi; Duman, Tolga M. (IEEE, 2020)
      A two-user interference channel with energy harvesting transmitters, each equipped with a finite battery, is considered. Achievable rate regions (ARRs) considering independent and identically distributed Shannon strategies ...
    • Connectivity analysis of an AUV network with OFDM based communications 

      Bereketli, A.; Tümçakır, M.; Yazgı, İ.; Yeni, B.; Köseoğlu, M.; Duman, Tolga M. (IEEE, 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 ...
    • Double-zipper: multiple access with zigzag decoding 

      Kazemi, Mohammad; Duman, Tolga M.; Medard, M. (IEEE, 2020)
      As a building block toward a simple and scalable solution to massive random access, we consider two-user multiple access with ZigZag decoding, with no need for any coordination or codebook differentiation. We derive ...
    • Editorial a message from the editor-in-chief 

      Duman, Tolga M. (IEEE, 2020)
    • Energy harvesting and wireless power transfer enabled wireless networks 

      Duman, Tolga M.; Zhao, N.; Nallanathan, A.; Chen, Y.; Pan, M. (Elsevier, 2020)
      Development of wireless communication networks, connected devices, and improvement of Internet of Things (IoT) will deeply impact in every aspect of human life. In future mobile systems, a tremendous number of low-power ...
    • Energy-harvesting irregular repetition slotted ALOHA with unit-sized battery 

      Demirhan, U.; Duman, Tolga M. (IEEE, 2018-05)
      We propose an irregular repetition slotted ALOHA (IRSA) based uncoordinated random access scheme for energy harvesting (EH) nodes. Specifically, we consider the case in which each user has a unit- sized battery that is ...
    • An improvement of the deletion channel capacity upper bound 

      Rahmati, M.; Duman, Tolga M. (IEEE, 2013-10)
      In this paper, we offer an alternative look at channels with deletion errors by considering equivalent models for deletion channels by 'fragmenting' the input sequence where different subsequences travel through different ...
    • Information rates of energy harvesting communications with intersymbol interference 

      Duman, Tolga M.; Stojanovic, M. (Institute of Electrical and Electronics Engineers Inc., 2019)
      We consider energy harvesting communications over an intersymbol interference (ISI) channel corrupted by additive white Gaussian noise. We assume that the energy arrivals at the transmitter, which is equipped with a finite ...
    • Irregular repetition slotted ALOHA with energy harvesting nodes 

      Demirhan, Umut; Duman, Tolga M. (IEEE, 2019-09)
      We propose an irregular repetition slotted ALOHA (IRSA) based uncoordinated random access scheme for energy harvesting (EH) nodes. Specifically, we consider the case in which each user has a battery that is recharged with ...
    • LDPC code design for fading interference channels 

      Shakiba-Herfeh, Mahdi; Tanc, A. K.; Duman, Tolga M. (IEEE, 2019-03)
      We focus on the two-user Gaussian interference channel (IC) with fading and study implementation of different encoding/decoding schemes with low-density parity-check (LDPC) codes for both quasi-static and fast fading ...
    • LDPC code design for fast fading interference channels 

      Shakiba-Herfeh, Mahdi; Tanc, A. K.; Duman, Tolga M. (IEEE, 2018-05)
      We focus on two-user Gaussian interference channels (ICs) with fast fading and study implementation of explicit all public and Han- Kobayashi (HK) coding schemes with low-density parity-check (LDPC) codes. Stability ...
    • LDPC codes for interference channels in the primary decodes cognitive regime 

      Shakiba-Herfeh, Mahdi; Tanç, A. K.; Duman, Tolga M. (Institute of Electrical and Electronics Engineers Inc., 2019)
      We investigate cognitive interference channels (CICs), a variant of two-user ICs in which one of the transmitters (called the cognitive transmitter) has non-causal knowledge of the other's (private user's) message. Prompted ...
    • Low complexity precoding for MIMOME wiretap channels based on cut-off rate 

      Aghdam, Sina Rezaei; Duman, Tolga M. (IEEE, 2016)
      We propose a low complexity transmit signal design scheme for achieving information-theoretic secrecy over a MIMO wiretap channel driven by finite-alphabet inputs. We assume that the transmitter has perfect channel state ...