Browsing by Author "Duman, Tolga M."

Now showing items 1-20 of 55

    • 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 ...

    • Approximate weight distribution of polarization-adjusted convolutional (PAC) codes 

      Seyedmasoumian, Sadra; Duman, Tolga M. (IEEE, 2022)
      Polarization-adjusted convolutional (PAC) codes combine polar and convolutional transformations to enhance the distance properties of polar codes. They offer a performance very close to the finite-length information-theoretic ...

    • 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 ...

    • Blind federated edge learning 

      Amiri, M. M.; Duman, Tolga M.; Gündüz, D.; Kulkarni, S. R.; Poor, H. V. (IEEE, 2021-03-19)
      We study federated edge learning (FEEL), where wireless edge devices, each with its own dataset, learn a global model collaboratively with the help of a wireless access point acting as the parameter server (PS). At each ...

    • Channel reconstruction based multiuser precoding with limited feedback 

      Özateş, Mert; Kazemi, Mohammad; Göken, Çağrı; Duman, Tolga M. (IEEE, 2021-09-06)
      We consider the downlink of a multiuser multiple-input multiple-output (MU-MIMO) system, where each user feeds back a partial channel state information (CSI), namely, the quantized version of the dominant eigenvector of ...

    • 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 ...

    • Collision resolution for random access 

      Kazemi, Muhammad; Duman, Tolga M. (IEEE, 2021-10-28)
      As a building block toward a simple and scalable solution for massive random access, we introduce collision-resolution algorithms using successive interference cancellation (SIC) based on the received signals, with no need ...

    • 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 ...

    • Deep neural network based precoding for wiretap channels with finite alphabet inputs 

      Gümüş, Mücahit; Duman, Tolga M. (IEEE, 2021-04-28)
      We consider secure transmission over multi-input multi-output multi-antenna eavesdropper (MIMOME) wiretap channels with finite alphabet inputs. We use a linear precoder to maximize the secrecy rate, which benefits from the ...

    • 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 ALOHA with replica concatenation 

      Akyıldız, Talha; Demirhan, U.; Duman, Tolga M. (IEEE, 2021)
      In this paper, we consider an asynchronous random access scheme called irregular repetition ALOHA (IRA) as a generalization of contention resolution ALOHA (CRA) with varying repetitions. We present an asymptotic performance ...

    • 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 ...

    • Hierarchical over-the-air federated edge learning 

      Aygün, Ozan; Kazemi, Mohammad; Gündüz, D.; Duman, Tolga M. (IEEE, 2022)
      Federated learning (FL) over wireless communication channels, specifically, over-the-air (OTA) model aggregation framework is considered. In OTA wireless setups, the adverse channel effects can be alleviated by increasing ...