Browsing by Author "(ORCID 0000-0001-5945-0813 & YÖK ID 124615) Uysal, Murat"
Now showing items 201-220 of 350
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Novel distributed space-time trellis codes for relay systems over cascaded rayleigh fading
İlhan, H.; Altunbaş, İ.; Uysal, Murat (IEEE, 2010-12)In this letter, we consider the deployment of distributed space-time trellis codes (STTCs) for user cooperation. We derive a pairwise error probability (PEP) expression for distributed STTCs over cascaded Rayleigh fading ... -
A novel pulse-positioned coding scheme for fiber fault monitoring of a PON
Rad, M. M.; Fathallah, H. A.; Maier, M.; Rusch, L. A.; Uysal, Murat (IEEE, 2011-09)In this letter, we propose a novel optical coding scheme for fiber link quality monitoring of a passive optical network (PON). The proposed scheme named incrementally pulse positioned coding (IPPC) is practically very ... -
A novel statistical channel model for turbulence-induced fading in free-space optical systems
Kashani, M. A.; Uysal, Murat; Kavehrad, M. (IEEE, 2015-06-01)In this paper, we propose a new probability distribution function which accurately describes turbulence-induced fading under a wide range of turbulence conditions. The proposed model, termed double-generalized gamma (double ... -
A novel statistical model for turbulence-induced fading in free-space optical systems
Kashani, M. A.; Uysal, Murat; Kavehrad, M. (IEEE, 2013)In this paper, we propose a new probability distribution function which accurately describes turbulence-induced fading under a wide range of turbulence conditions. The proposed model, termed Double GG distribution, is based ... -
On the benefits of cooperation via power control in OFDM-based visible light communication systems
Kashef, M.; Abdallah, M.; Qaraqe, K.; Haas, H.; Uysal, Murat (IEEE, 2014)In this paper, the performance of a visible light communication (VLC) network exploiting power control is considered. The achievable rate region of two VLC communication pairs is characterized. The system employs optical ... -
On the effects of combined atmospheric fading and misalignment on the hybrid FSO/RF transmission
Touati, A.; Abdaoui, A.; Touati, F.; Uysal, Murat; Bouallegue, A. (The Optical Society, 2016)Free-space optical (FSO) communication is known for its various impairments such as atmospheric turbulence and misalignment fading. In this paper, we study the performance of an FSO link operating under combined path loss ... -
On the effects of temperature on the performances of FSO transmission under qatar's climate
Touati, A.; Abdaoui, A.; Touati, F.; Uysal, Murat; Bouallegue, A. (IEEE, 2017-11-14)Strong atmospheric turbulence can highly affect the free space optical (FSO) link. In fact, the strength of turbulence is depending on weather factors where the temperature is considered as the main parameter increasing ... -
On the optimization of underwater quantum key distribution systems with time-gated SPADs
Raouf, Amir Hossein Fahim; Uysal, Murat (Optica Publishing Group, 2022-08-01)In this paper, we study the effect of various transmitter and receiver parameters on the quantum bit error rate (QBER) performance of underwater quantum key distribution. We utilize a Monte Carlo approach to simulate the ... -
On the performance analysis of multirelay cooperative diversity systems with channel estimation errors
Amin, O.; Ikki, S. S.; Uysal, Murat (IEEE, 2011-06)In this paper, we investigate the performance of an amplify-and-forward (AF) cooperative diversity system with multiple relays in the presence of channel estimation errors. We consider both conventional relaying (in which ... -
On the performance of DCO-OFDM visible light communication systems under illumination constraints
Aldırmaz Çolak, S.; Kızılırmak, R. Ç.; Uysal, Murat (IEEE, 2015)In this paper, we consider a DC-biased optical-orthogonal frequency division multiplexing (DCO-OFDM) visible light communication system and investigate its error rate performance under illumination constraints. First, we ... -
On the performance of MIMO cooperative transmission for broadband vehicular networks
Feteiha, M. F.; Uysal, Murat (IEEE, 2015-06)In this paper, we investigate the performance of a cooperative vehicular network over a doubly selective fading channel using multiple antennas at source and destination vehicles. Under the assumption of amplify-and-forward ... -
On the performance of MIMO FSO communications over double generalized gamma fading channels
Kashani, M. A.; Uysal, Murat; Kavehrad, M. (IEEE, 2015)A major performance degrading factor in free space optical communication (FSO) systems is atmospheric turbulence. Spatial diversity techniques provide a promising approach to mitigate turbulence-induced fading. In this ... -
On the performance of MIMO OFDM-based intra-vehicular VLC networks
Turan, B.; Narmanlıoğlu, Ömer; Coleri Ergen, S.; Uysal, Murat (IEEE, 2016)Vehicular hotspots for on-board Internet access using Long Term Evolution (LTE) as the backhaul network has recently gained popularity. Currently, Wi-Fi is the most common technology to provide in-vehicle access, where ... -
On the performance of multi-hop free space optical cooperative systems
Ashrafzadeh, B.; Zaimbashi, A.; Soleirnani-Nasab, E.; Uysal, Murat (IEEE, 2018)In this paper, we investigate the performance analysis of multi-hop free space optical (FSO) systems over Double Generalized Gamma (DGG) turbulence fading with pointing error impairments assuming both heterodyne detection ... -
On the performance of NCC-OFDMA systems in the presence of carrier frequency offset
Heidarpour, Ali Reza; Kurt, G. K.; Uysal, Murat (IEEE, 2017)Network coded cooperative (NCC) systems have recently gained increasing attention due to their high power and spectral efficiency. For high speed data transmission over frequency-selective channels, NCC is further combined ... -
On the performance of SC-FDE schemes with decision feedback equalizer for visible light communications
Çelik, Y.; Kızılırmak, R. Ç.; Odabaşıoğlu, N.; Uysal, Murat (IEEE, 2015)In this paper, we investigate the two single carrier frequency domain equalization (SC-FDE) techniques, namely on-off keying single carrier frequency domain equalization (OOK-SC-FDE) and decomposed quadrature optical ... -
Operation altitude optimization of solar-powered rotary-wing UAVs for FSO backhauling
Mahmoodi, Khadijeh Ali; Elamassie, Mohammed; Uysal, Murat (IEEE, 2023)Free space optical communication (FSO) has emerged as an alternative backhauling technology. It provides a line-of-sight (LOS) link with a capacity comparable to fiber optics and much higher than those that can be supported ... -
Optical MIMO-OFDM with generalized LED index modulation
Yesilkaya, A.; Basar, E.; Miramirkhani, Farshad; Panayirci, E.; Uysal, Murat (IEEE, 2017-08)Visible light communications (VLC) is a promising and uncharted new technology for the next generation of wireless communication systems. This paper proposes a novel generalized light emitting diode (LED) index modulation ... -
Optical wireless communications – an emerging technology
Uysal, Murat; Nouri, Hatef (IEEE, 2014)Optical wireless communication (OWC) enables wireless connectivity using infrared, visible or ultraviolet bands. With its powerful features such as high bandwidth, low cost and operation in an unregulated spectrum, OWC can ... -
Optik iletişim sistemlerinde standart CMOS fotodiyotların uygulaması
Çamlı, B.; Yalçınkaya, A. D.; Pusane, A. E.; Kısacık, Rıfat; Maç, Muhittin; Uysal, Murat; Baykaş, T. (IEEE, 2017)Bu bildiride standart CMOS üretim süreçleri ile gerçeklenmiş, mikroelektronik sistemlere düşük maliyetlerle tümleştirilebilecek fotodiyot yapılarının optik haberleşme sistemlerine uygulanabilirliği incelenmiştir. Silikon ...
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