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    Joint cell muting and user scheduling in multicell networks with temporal fairness

    , Article Wireless Communications and Mobile Computing ; Volume 2018 , 2018 ; 15308669 (ISSN) Shahsavari, S ; Akar, N ; Khalaj, B. H ; Sharif University of Technology
    Hindawi Limited  2018
    A semicentralized joint cell muting and user scheduling scheme for interference coordination in a multicell network is proposed under two different temporal fairness criteria. In the proposed scheme, at a decision instant, each base station (BS) in the multicell network employs a cell-level scheduler to nominate one user for each of its inner and outer sections and their available transmission rates to a network-level scheduler which then computes the potential overall transmission rate for each muting pattern. Subsequently, the network-level scheduler selects one pattern to unmute, out of all the available patterns. This decision is shared with all cell-level schedulers which then forward... 

    Space-frequency coded cooperation in OFDM multiple-access wireless networks

    , Article IET Communications ; Volume 1, Issue 6 , December , 2007 , Pages 1152-1160 ; 17518628 (ISSN) Jamshidi, A ; Nasiri Kenari, M ; Zeinalpour, Z ; Taherpour, A ; Sharif University of Technology
    A cooperative space-frequency (SF) coded orthogonal frequency division multiplexing system is considered and its performance over quasi-static frequency-selective Rayleigh fading channels is evaluated. An expression for exact outage error probability is derived and its tight closed-form lower bound is presented. The tightness of the lower bound is demonstrated through Monte Carlo simulation. Asymptotic analysis indicates that the proposed protocol achieves full spatial and frequency diversities available in the cooperative communication system. The theoretical analysis of the proposed SF coded cooperation protocol is further confirmed by computer simulation using a previously introduced SF... 

    Designing of a static frequency observer for GMAW process in the globular transfer mode

    , Article ICCAS 2010 - International Conference on Control, Automation and Systems, 27 October 2010 through 30 October 2010, Gyeonggi-do ; 2010 , Pages 286-289 ; 9781424474530 (ISBN) Khalili, M ; Haeri, M ; Doodman Tipi, A. R ; Sharif University of Technology
    In the welding process, droplet detachment regularity is important for a good welding quality. The frequency of detachment is one of influential indices for assessing the quality of GMAW in the globular transfer mode. In this paper, a relationship is estimated for measuring droplet detachment frequency in the globular GMAW. The droplet detachment frequency is estimated with a curve fitting by the least squares error (LSE) method. By using short time frequency transform (STFT) we can extract the frequency contents from the mass of drop that is one of the states in the welding model