Now showing items 1-20 of 32

    • Autofocused spotlight SAR image reconstruction of off-grid sparse scenes 

      Camlıca, S.; Gurbuz, A. C.; Arıkan, O. (Institute of Electrical and Electronics Engineers Inc., 2017)
      Synthetic aperture radar (SAR) has significant role in remote sensing. Phase errors due to uncompensated platform motion, measurement model mismatch, and measurement noise can cause degradations in SAR image reconstruction. ...
    • Broadcast erasure channel with feedback: The two multicast case-Algorithms and bounds 

      Onaran, E.; Gatzianas, M.; Fragouli, C. (2013)
      We consider the single hop broadcast packet erasure channel (BPEC) with two multicast sessions (each of them destined to a different group of N users) and regularly available instantaneous receiver ACK/NACK feedback. Using ...
    • Capacity bounds for an ultra-wideband channel model 

      Ankan, E. (2004)
      There is an ongoing effort by the IEEE 802.15.3a subcommittee to reach a UWB personal area network standard. We estimate the achievable rates for such networks using a channel model specified by the same group. The analysis ...
    • Communication efficient channel estimation over distributed networks 

      Sayin, M.O.; Vanli, N.D.; Goze, T.; Kozat, S.S. (Institute of Electrical and Electronics Engineers Inc., 2014)
      We study diffusion based channel estimation in distributed architectures suitable for various communication applications such as cognitive radios. Although the demand for distributed processing is steadily growing, these ...
    • Cost-efficient approximation of linear systems with repeated and multi-channel filtering configurations 

      Kutay, M. A.; Erden, M. F.; Ozaktas, H. M.; Arikan, O.; Candan, Ç.; Güleryüz, Ö. (IEEE, Piscataway, NJ, United States, 1998)
      It is possible to obtain either exact realizations or useful approximations of linear systems or matrix-vector products arising in many different applications, by synthesizing them in the form of repeated or multi-channel ...
    • Decentralized stabilization: characterization of all solutions and genericity aspects 

      Ünyelioğlu, Konur Alp; Özgüler, Arif Bülent (Taylor & Francis, 1992)
      Electrical and The decentralized stabilization problem of multivariable finite-dimensional systems is considered in a fractional set-up. A new synthesis procedure for decentralized stabilizing compensators is proposed. The ...
    • Decoding strategies at the relay with physical-layer network coding 

      Bhat, U.; Duman, T. M. (Institute of Electrical and Electronics Engineers, 2012)
      A two-way relay channel is considered where two users exchange information via a common relay in two transmission phases using physical-layer network coding (PNC). We consider an optimal decoding strategy at the relay to ...
    • A delay-tolerant asynchronous two-way-relay system over doubly-selective fading channels 

      Salim, A.; Duman, T. M. (Institute of Electrical and Electronics Engineers Inc., 2015)
      We consider design of asynchronous orthogonal frequency division multiplexing (OFDM) based diamond two-way-relay (DTWR) systems in a time-varying frequency-selective (doubly-selective) fading channel. In a DTWR system, two ...
    • Evaluating spatial diversity technique for mitigating multipath fading of fixed terrestrial point-to-point systems 

      Goktas P.; Topcu, S.; Karasan, E.; Altintas, A. (Institute of Electrical and Electronics Engineers Inc., 2015)
      Multipath fading is the dominant propagation factor for fixed terrestrial microwave line-of-sight (LOS) radio links operating at frequencies below 10 GHz. Fading due to multipath propagation attenuates received signals on ...
    • Input sequence estimation and blind channel identification in HF communication 

      Khames, M.; Miled, B. H.; Arikan, O. (IEEE, Piscataway, NJ, United States, 2000)
      A new algorithm is proposed for reliable communication over HF tropospheric links in the presence of rapid channel variations. In the proposed approach, using fractionally space channel outputs, sequential estimation of ...
    • Joint source-channel coding and guessing 

      Arikan Erdal, Merhav Neri (IEEE, Piscataway, NJ, United States, 1997)
      We consider the joint source-channel guessing problem, define measures of optimum performance, and give single-letter characterizations. As an application, sequential decoding is considered.
    • Joint source-channel coding and guessing with application to sequential decoding 

      Arikan, E.; Merhav, N. (Institute of Electrical and Electronics Engineers, 1998-09)
      We extend our earlier work on guessing subject to distortion to the joint source-channel coding context. We consider a system in which there is a source connected to a destination via a channel and the goal is to reconstruct ...
    • Large deviations of probability rank 

      Arikan, E. (2000)
      Consider a pair of random variables (X,Y) with distribution P. The probability rank function is defined so that G(x|y) = 1 for the most probable outcome x conditional on Y = y, G(x|y) = 2 for the second most probable ...
    • A low-complexity time-domain MMSE channel estimator for space-time/frequency block-coded OFDM systems 

      Şenol, H.; Çırpan, H. A.; Panayırcı, E.; Çevik, M. (Hindawi Publishing Corporation, 2006)
      Focusing on transmit diversity orthogonal frequency-division multiplexing (OFDM) transmission through frequency-selective channels, this paper pursues a channel estimation approach in time domain for both space-frequency ...
    • Mode separation and direction of arrival estimation in HF links 

      Arikan, F.; Yilmaz, N.; Arikan, O.; Miled, M. K. B. H. (Wiley-Blackwell Publishing, 2003)
      Estimation of arrival angles and incoming signals is a challenging problem for HF channels where the signals are correlated and the separation between the signals can be as low as a couple of degrees. In this paper, a new ...
    • Multi-resampling Doppler compensation in cooperative underwater OFDM systems 

      Karakaya, B.; Hasna, M.O.; Duman, T.M.; Uysal, M.; Ghrayeb, A. (2013)
      We consider a multi-carrier cooperative underwater acoustic communication (UWAC) system and investigate the Doppler scaling problem arising due to the motion of different nodes. Specifically, we assume an orthogonal frequency ...
    • Multiperson tracking with a network of ultrawideband radar sensors based on gaussian mixture PHD filters 

      Gulmezoglu, B.; Guldogan, M. B.; Gezici, S. (Institute of Electrical and Electronics Engineers Inc., 2015)
      In this paper, we investigate the use of Gaussian mixture probability hypothesis density filters for multiple person tracking using ultrawideband (UWB) radar sensors in an indoor environment. An experimental setup consisting ...
    • Noncoherent space-time coding: an algebraic perspective 

      El Gamal, H.; Aktas, D.; Damen, M. O. (IEEE, 2005-06)
      The design of space-time signals for noncoherent block-fading channels where the channel state information is not known a priori at the transmitter and the receiver is considered. In particular, a new algebraic formulation ...
    • Nondata-aided channel estimation for OFDM systems with space-frequency transmit diversity 

      Cırpan, H. A.; Panayırcı, E.; Doğan, H. (Institute of Electrical and Electronics Engineers, 2006)
      This paper proposes a computationally efficient nondata-aided maximum a posteriori (MAP) channel-estimation algorithm focusing on the space-frequency (SF) transmit diversity orthogonal frequency division multiplexing (OFDM) ...
    • Nonthermal Quantum Channels as a Thermodynamical Resource 

      Navascués, M.; García-Pintos L.P. (American Physical Society, 2015)
      Quantum thermodynamics can be understood as a resource theory, whereby thermal states are free and the only allowed operations are unitary transformations commuting with the total Hamiltonian of the system. Previous ...