Browsing Faculty of Engineering by Author "(ORCID 0000-0001-5945-0813 & YÖK ID 124615) Uysal, Murat"
Now showing items 221-240 of 349
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Optimal bit and power loading for amplify-and-forward cooperative OFDM systems
Amin, O.; Uysal, Murat (IEEE, 2011-03)In this paper, we investigate bit and power allocation strategies for an orthogonal frequency division multiplexing (OFDM) cooperative network over frequency-selective fading channels. We assume amplify-and-forward relaying ... -
Optimal choice of transmission parameters for LDPC-coded CPM
Foruhandeh, Mahsa; Uysal, Murat; Altunbaş, İ.; Güven, T.; Gerçek, A. (IEEE, 2014)Continuous phase modulation (CPM) has attractive features such as spectral efficiency and constant envelope making it attractive for tactical waveforms. Serial concatenation of CPM with Low Density Parity Check Codes (LDPCs) ... -
Optimal combiners in optical wireless systems with spatial diversity and pre-amplification
Yiannopoulos, K.; Sagias, N. C.; Boucouvalas, A. C.; Uysal, Murat; Ghassemlooy, Z. (IEEE, 2016)We present analytical results on the operation of a pre-amplified optical wireless communication (OWC) system that also takes advantage of spatial diversity to improve its outage probability and average bit-error-rate (BER) ... -
Optimal relay placement and diversity analysis of relay-assisted free-space optical communication systems
Kashani, M. A.; Safari, M.; Uysal, Murat (IEEE, 2013-01)Relay-assisted free-space optical (FSO) transmission exploits the fact that atmospheric turbulence fading variance is distance dependent and yields significant performance gains by taking advantage of the resulting shorter ... -
Optimal relay placement in cooperative free-space optical communication systems
Aminikashani, Mohammadreza; Safari, M.; Uysal, Murat (IEEE, 2012)Relay-assisted free-space optical (FSO) transmission exploits the fact that atmospheric turbulence fading variance is distance dependent and yields significant performance gains by taking advantage of the resulting shorter ... -
Optimal resource allocation and interference management for multi-user uplink light communication systems with angular diversity technology
Eldeeb, Hossıen Badr; Hosney, M.; Elsayed, H. M.; Badr, R. I.; Uysal, Murat; Selmy, H. A. I. (IEEE, 2020)Light communication (LC) technology has been regarded as a promising candidate for future indoor wireless networks by providing safe, power-efficient, and high data rate communications needed for tomorrow's applications. ... -
Opto-electronic receiver system with post-equalization for visible light communications
Kısacık, Rıfat; Erkınacı, T.; Yağan, M. Y.; Pusane, A. E.; Uysal, Murat; Baykaş, T.; Dündar, G.; Yalçınkaya, A. D. (IEEE, 2020-10-05)In this work, A significant increase in the data rate is achieved by designing an opto-electronic receiver for the visible light communication system. LEDs used at the transmitter side in the visible light communication ... -
Outage analysis of hybrid FSO/RF systems based on finite-state Markov Chain modeling
Kazemi, Hossein; Uysal, Murat; Touati, F. (IEEE, 2014)In this paper, we analyze the outage probability of a hybrid free-space optical/radio-frequency (FSO/RF) communication system with soft-switching. In soft-switching approach, either one of the links or both links can be ... -
Outage analysis of Hybrid-ARQ protocols in coherent free-space optical communications
Aghajanzadeh, S. M.; Uysal, Murat (IEEE, 2011)In this paper, we investigate the performance of automatic retransmission request (ARQ) protocols in coherent free-space optical (FSO) communications. Specifically, we study the outage performance of three different ... -
Outage analysis of q-duplex RF/FSO relaying
Jamali, V.; Michalopoulos, D. S.; Uysal, Murat; Schober, R. (IEEE, 2015)In this paper, we propose and analyze a novel q-duplex radio frequency/free space optical (RF/FSO) relaying protocol for a mixed RF and hybrid RF/FSO communication system. In our scheme, several mobile users transmit their ... -
Outage capacity and throughput analysis of multiuser FSO systems
Zhalehpour, Sasan; Uysal, Murat; Dobre, O. A.; Ngatched, T. (IEEE, 2015)In this paper, we investigate the performance of free space optical (FSO) systems with a multiuser scheme employing select-max scheduling technique. Specifically, we consider an FSO communication system which employs a ... -
Outage capacity regions of multicarrier DF relaying in underwater acoustic channels
Al-Dharrab, S.; Uysal, Murat (IEEE, 2012)In this paper, we investigate the information theoretical limits on the performance of cooperative multicarrier underwater acoustic (UWA) communication systems. We assume decode-and-forward (DF) relaying and consider ... -
Outage performance analysis of mth best path selection protocol in FSO communications
Zhalehpour, Sasan; Uysal, Murat (IEEE, 2014)In this paper, we investigate the performance of free space optical (FSO) systems with parallel multihop relaying and path selection. Specifically, we consider an FSO communication system which employs M parallel relaying ... -
Outage performance analysis of vertical underwater VLC links
Elamassie, Mohammed; Uysal, Murat (IEEE, 2022)In this paper, we investigate the outage performance of vertical stratified underwater optical links in the presence of moderate/strong turbulence conditions. Specifically, we consider the cascaded Gamma-Gamma turbulence ... -
Outage performance and diversity gain analysis of free-space optical multi-hop parallel relaying
Aminikashani, Mohammadreza; Uysal, Murat (IEEE, 2013-08)In this paper, we investigate the outage performance of free-space optical mesh networks, which build upon the combination of serial (multi-hop) and parallel relaying. We assume log-normal atmospheric turbulence channels ... -
Outage performance and DMT analysis of DF parallel relaying in FSO IM/DD communications
Aghajanzadeh, S. M.; Uysal, Murat (IEEE, 2012)In this paper, we investigate the performance of cooperative diversity transmission in free-space optical (FSO) communications. We consider an FSO cooperative diversity system with a single decode-and-forward relay and a ... -
Outage performance of FSO multi-hop parallel relaying
Aminikashani, Mohammadreza; Uysal, Murat (IEEE, 2012)In this paper, we investigate the outage performance of relay-assisted free-space optical (FSO) networks which build upon the combinations of serial and parallel relaying. We assume log-normal atmospheric turbulence channels ... -
Outage performance of MIMO free-space optical systems in gamma-gamma fading channels
Kazemi, Hossein; Mostaani, Zohreh; Uysal, Murat; Ghassemlooy, Z. (IEEE, 2013)In this paper, we consider a MIMO Free-Space Optical (FSO) communication system over gamma-gamma turbulence channels and derive a closed-form analytical expression for the outage probability taking into account the effects ... -
Outage performance of mixed RF-FSO systems over DGG and nakagami-m channels
Ashrafzadeh, B.; Soleimani-Nasab, E.; Zaimbashi, A.; Uysal, Murat (IEEE, 2020-12)In mixed RF (radio frequency)-FSO (free space optical) systems, the FSO link is used for backhauling while RF is used for wireless access. In many practical deployment scenarios especially in urban environments, more than ... -
Outage performance of multi-hop hybrid FSO/RF communication systems
Kazemi, H.; Uysal, Murat; Touati, F.; Haas, H. (IEEE, 2015)In this paper, five scenarios are considered for the realization of a multi-hop hybrid free-space optical/radio frequency (FSO/RF) communication system with decode-and-forward (DF) relaying, and analytical outage probability ...
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