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Bulunan: 9 Adet 0.002 sn
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Erişime Açık

A novel concatenated lwt and wht based ufmc waveform design forthe next generation wireless communication systems

Ali ÖZEN | Asuman SAVAŞÇIHABEŞ

A novel concatenated Lifting Wavelet Transform (LWT) and Walsh Hadamard Transform (WHT) with Universal Filtered MultiCarrier (UFMC) waveform is suggested as an alternative to Orthogonal Frequency Division Multiplexing (OFDM) waveformfor the next generation wireless telecommunication systems in this paper. The suggested waveform is composed of LWT andWHT with UFMC waveform. Both the elimination the disadvantages of OFDM and the improvement the achievement of UFMCwaveform, from the fifth generation waveform candidates, has been aimed with the suggested waveform. In order to verify theperformance ...Daha fazlası

Makale/Derleme 2020 IEEJ Transactions on Electrical and Electronic Engineering 17 Görüntülenme
Erişime Açık

A novel gfdm waveform design based on cascaded wht-lwt transform for the beyond 5g wireless communications

Asuman SAVAŞÇIHABEŞ | Ali ÖZEN

In this paper, a new WHT-LWT-GFDM waveform obtained by combining Walsh–Hadamard Transform (WHT), Lifting Wavelet Transform (LWT), and Generalized Frequency Division Multiplexing (GFDM) is presented for use in next-generation wireless communication systems. The proposed approach meets the requirement of 5th-generation (5G) and beyond communication schemes in terms of low latency, low peak-to-average-power ratio (PAPR), and low bit-error rate (BER). To verify the performance of the presented waveform, PAPR and BER simulation results were obtained in additive white Gaussian noise (AWGN) and flat ...Daha fazlası

Makale/Derleme 2021 Sensors 11 Görüntülenme
Erişime Açık

Lifting wavelet transform based multicarrier modulation scheme for coherent optical communication systems

Ali ÖZEN

In this paper, it was proposed a new multicarrier modulation scheme, based on lifting wavelet transform for coherent optical communication systems. This new wave scheme used the energy compaction property of lifting wavelet transform that provides low leakage in subcarriers. The new wave scheme based system was allowed improved performance in terms of bit error rate and reduction in the peak to average power ratio compared to conventional cyclic prefix based OFDM. It was found that the use of the new wave scheme was possible to extend the transmission distance by 100 km and 150 km compared to ...Daha fazlası

Makale/Derleme 2021 Journal of Lightwave Technology39 ( 13 ) , pp. 4 - 4261 4 Görüntülenme
Erişime Açık

Seismic performance of shallow depth tuned liquid damper

Ali BOZER

Tuned Liquid Dampers (TLD) consist of a container that is generally partially filled with water. When the sloshing frequency of the water mass is tuned to the fundamental mode of the primary structure a significant amount of sloshing and wave breaking can be achieved which are the primary sources of energy dissipation. Although TLDs are easy to install, operate and maintain; it is generally challenging to model the nonlinear nature of sloshing water. Equivalent mechanical models provide a simplified solution in which sloshing liquid mass, liquid damping, and sloshing frequency are represented ...Daha fazlası

Makale/Derleme 2021 THE INTERNATIONAL JOURNAL OF RESEARCH ON ENGINEERING STRUCTURES AND MATERIALS 12 Görüntülenme
Erişime Açık

A novel papr reduction technique combining the pts and clipping method

Ali ÖZEN | Asuman SAVAŞÇIHABEŞ

In this paper, it is recommended to combine the partial transmit sequence (PTS) and amplitude clipping (AC) methods as a solution to the peak to average power ratio (PAPR) problem of multi-carrier (MC) communication systems. The suggested technique is verified on zero tail discrete cosine transform spread OFDM (ZT-DCT-s OFDM), ZT discrete Fourier transform spread OFDM (ZT-DFT-s OFDM) and ZT discrete sine transform spread OFDM (ZT-DST-s OFDM) waveforms, from the next generation waveform alternative to OFDM, with classical OFDM waveform. Computer simulation studies are performed to verify the su ...Daha fazlası

Bildiri 2021 IEEE 44th International Conference On Telecommunications And Signal Processing, Tsp 2021 , pp. 3 - 398 8 Görüntülenme
Erişime Açık

Enhancing The Performance Of Flip-Ofdm Systems With Channel Coding Techniques For Visible Light Communications

Ali ÖZEN

This paper suggests employing channel encoders techniques to develop the attainment of the Flip-OFDM system. Reed Solomon (RS) and convolutional coders (CC) are used as channel coding techniques. Simulation works are carried out in AWGN channel and flat fading optical LOS channel surroundings to compare the performance of Non-Encoded VLC-OFDM, NonEncoded Flip-OFDM, RS-Coded Flip-OFDM and 1/2 rate CC Coded Flip-OFDM systems on bit error rate (BER) achievement benchmark. From the acquired numerical outcomes, it is observed that especially the 1/2 CC Coded Flip-OFDM method is better than other me ...Daha fazlası

Bildiri 2021 Ieee International Conference On Electrical, Computer, Communications And Mechatronics Engineering (Iceccme 2021) , pp. 1 - 5 6 Görüntülenme
Erişime Açık

A comparative study of coded and uncoded optical frequency domain channel equalizer in visible light communications

Ali ÖZEN

This article recommends using channel encoders to develop the achievement of optical single carrier frequency domain equalizers (OSC-FDE) in multi-path optical channel environment, which is an alternative to OFDM waveform for visible light communication (VLC) systems. Reed Solomon (RS) and convolutional coding (CC) are used as channel encoders. Computer simulations are made to compare the encoded OSCFDE method with the non-encoded OSC-FDE and VLC-OFDM methods over the bit error rate (BER) achievement criteria. From the acquired outcomes, it is perceived that 18 dB SNR development is achieved, ...Daha fazlası

Bildiri 2022 Ieee International Conference On Electrical, Computer, Communications And Mechatronics Engineering (Iceccme 2021) , pp. 1 - 4 11 Görüntülenme
Erişime Açık

The effect of perioperative immunonutrition on surgical complications and quality of life in patients with head and neck cancer

Eda BAŞMISIRLI

Rationale: This intervention study, which was planned as a prospective randomized controlled, was conducted to compare the effects of perioperative nutritional support with immunonutrition and standard enteral products on postoperative complications and quality of life in patients with head and neck cancer (HNC). Methods: Between April February 2019 and February 2021, the study was conducted in Erciyes University Faculty of Medicine and Kayseri City Hospital Otolaryngology and Head Neck Surgery Clinic with 34 hospitalized patients with a diagnosis of HNC. Five days before surgery and 10 days ...Daha fazlası

Bildiri 2021 Espen 2021 , pp. 7 - 750 11 Görüntülenme
Erişime Açık

Does childhood chemotherapy affect mandibular bone structues in a life time?

Hatice Cansu KIŞ | Ebru DELİKAN

Background: Chemotherapy, one of the most important treatment modalities for treating childhood cancers, is a major cause of bone loss in patients and survivors. Objectives: This study aimed to evaluate mandibular bone structures in childhood cancer survivors (CCSs) by means of fractal dimension (FD) analysis and the Klemetti index (KI), and to compare them with regard to the control group. Material and methods: In this retrospective study, the panoramic radiographs of 49 CCSs were included as the study group and the panoramic radiographs of 49 cancer-free volunteers were included as the contr ...Daha fazlası

Makale/Derleme 2022 Dental and Medical Problems59 ( 4 ) , pp. 4 - 501 3 Görüntülenme
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