Browsing by Publisher "IEEE Computer Society"
Now showing items 1-12 of 12
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Circuit model for given reflectance data constructed with mixed lumped and distributed elements for high speed/high frequency communication systems
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Publisher and Date:(IEEE Computer Society, 2005)In this paper, a reflectance-based "non linear interpolation method" is presented to model the measured or computed data, obtained from a "passive one-port physical device" using mixed lumped and distributed elements. Mixed element model is constructed with cascade connection of series inductors [L], commensurate transmission lines or so called Unit Elements [UE] and shunt capacitors[C]. Basis of the new model rests on the numerical generation of the scattering parameters of the lossless two-port ...
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A Comparative Study of Energy Models for Turkish Electricity Market Using LEAP
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Publisher and Date:(IEEE Computer Society, 2019)Fossil fuel thermal power plants constitute a large part of the Turkish electricity generation capacity. Turkish government has been developing several energy policy documents to evaluate how various renewable energy sources of the country can be utilized optimally in the generation of electricity within the next 30 years. This study considers three scenarios in the transition to renewable energy for Turkey; the business as usual (BAU), energy conservation (EC) and renewable energy (REN) scenarios. ...
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Generation/transmission investment planning integrated with market equilibrium models in electricity markets
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Publisher and Date:(IEEE Computer Society, 2017)This paper introduces integrated models for transmission investments anticipating the generation investments and market-clearing equilibrium. Market-clearing models for deregulated electricity markets can inform decision makers on price signals formed in the competitive market other investor's and/or generator's behaviors underlying these price signals and new generation/transmission investment decisions. Bi-level programming problems are formed for this integrated models and reformulated by using ...
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Iterative channel estimation for spatial modulation systems over fast fading channels [Hızlı sönümlemeli kanallarda uzaysal modülasyon sistemleri için iteratif kanal kestirimi]
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Publisher and Date:(IEEE Computer Society, 2014)Spatial Modulation (SM) based on the use of antenna indices to transmit information in addition to the conventional signal constellations has been recently proposed to solve practical problems encountered in MIMO systems. In the literature estimation of CSI for SM systems is simply investigated by RLS for slow fading channels. However iterative receivers that offer significant performance gains over a non-iterative when the total number of pilot is not sufficient and the channel is fast fading ...
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Noncoherent Ultra Wideband Wireless Sensor Networks for Primary User Detection
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Publisher and Date:(IEEE Computer Society, 2016)As a result of increasing demand for new technologies unlicensed usage of available spectrum has become very essential to provide an efficient usage of spectrum. For that reason sensor networks may be a reliable option to decide on the absence/presence of licensed users and to communicate without causing much interference as a secondary user network. These networks consist of two communication links for primary user detection. One link is between the primary user and the sensors and the other link ...
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On Channel Estimation in DC Biased Optical OFDM Systems Over VLC Channels
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Publisher and Date:(IEEE Computer Society, 2016)Visible Light Communication(VLC) has been considered as a potential access option for 5G wireless systems to solve performance limitation due to bandwidth shortage at radio frequency (RF) band. In (VLC) system illumination infrastructure has dual usage at the same time namely illumination and wireless data transmission. DC Biased optical (DCO)-OFDM has been proposed for VLC systems to provide optically power efficient solution and easy implementation. Wireless communication systems generally require ...
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Outage probability of a cooperative maximum ratio transmission [İşbirlikli maksimum oranlı iletimin kesinti olasılığı]
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Publisher and Date:(IEEE Computer Society, 2014)In this paper we present a cooperative communication system employing maximum ratio transmission technique and its outage probability performance over Rayleigh fading channels. Since maximum ratio transmission can achieve full diversity when used at tranmitters having multiple antennas while requiring no complexity increase at the receiver the proposed system can be a preferable structure to be used both at the source and amplify-forward type relays of wireless networks to provide high speed and ...
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Performance of Combinational Cooperative Detection Method under Realistic Conditions
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Publisher and Date:(IEEE Computer Society, 2020)Combinational cooperative detection (CCD) is a method where signal energies from multiple secondary users (SUs) are gathered in different combinations in order to reach a unique decision for each secondary user regarding the activity of the primary user. In earlier implementations of the CCD method, the locations of the SUs have been assumed to be fixed and selected near the border points of the communication area, and the detection performance has been studied for different parameters. In this ...
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Reformulations of a Bilevel Model for Detection of Tacit Collusion in Deregulated Electricity Markets
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Publisher and Date:(IEEE Computer Society, 2019)In this study, we consider a collusion model for competitive pool based electricity markets operated by an independent system operator (ISO), where it aims to prevent tacit collusion among generators. In order to determine the existence of tacit collusion in the market, we have employed the the game-Theoretic bilevel optimization model proposed by [1]. This model represents the market clearing mechanism, where generators determine their bids in order to maximize their profit while the system ...
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Sparse channel estimation for OFDM-based underwater cooperative systems with amplify-and-forward relaying
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Publisher and Date:(IEEE Computer Society, 2014)This paper is concerned with a challenging problem of channel estimation for amplify-and-forward cooperative relay based orthogonal frequency division multiplexing (OFDM) systems in the presence of sparse underwater acoustic channels and of the correlative non-Gaussian noise. We exploit the sparse structure of the channel impulse response to improve the performance of the channel estimation algorithm due to the reduced number of taps to be estimated. The resulting novel algorithm initially estimates ...
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The Effect of Primary User Bandwidth on Bayesian Compressive Sensing Based Spectrum Sensing
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Publisher and Date:(IEEE Computer Society, 2016)The application of compressive sensing (CS) theory has found great interest in wideband spectrum sensing. Although most studies have considered perfect reconstruction of the primary user signal it is actually more important to assess the presence or absence of the signal. Among CS based methods Bayesian CS (BCS) takes into consideration the prior information of signal coefficients to be estimated which improves signal reconstruction performance. On the other hand the sparsity level of the signal ...
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Why do students prefer search engines over academic databases
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Publisher and Date:(IEEE Computer Society, 2013)Students' preference of search engines in online information retrieval has been a problem for several reasons. This work tries to share our experience about the reasons why they do not utilize academic databases. Past experiences seeking convenience and the availability of automatic translation in search engines seem to be the main reasons. Several suggestions are offered that aim to increase the level of competency of students in utilizing academic databases. Furthermore students should also be ...
