Ali Özgür Yılmaz

E-mail
aoyilmaz@metu.edu.tr
Department
Department of Electrical and Electronics Engineering
Scopus Author ID
Beamformer Design With Smooth Constraint-Free Approximation in Downlink Cloud Radio Access Networks
Kadan, Fehmi Emre; Yılmaz, Ali Özgür (2021-01-01)
It is known that data rates in standard cellular networks are limited due to inter-cell interference. An effective solution of this problem is to use the multi-cell cooperation idea. In Cloud Radio Access Network, which is...
Performance Analysis of Quantized Uplink Massive MIMO-OFDM With Oversampling Under Adjacent Channel Interference
Üçüncü, Ali Bulut; Bjornson, Emil; Johansson, Hakan; Yılmaz, Ali Özgür; Larsson, Erik G. (Institute of Electrical and Electronics Engineers (IEEE), 2020-02-01)
Massive multiple-input multiple-output (MIMO) systems have attracted much attention lately due to the many advantages they provide over single-antenna systems. Owing to the many antennas, low-cost implementation and low po...
Joint Mitigation of IQ Imbalance and Power Amplifier Impairments by Real Valued Time Delay Neural Networks
Yeşil, Soner; Gürtunca, Burak; Yılmaz, Ali Özgür (2019-08-22)
This paper represents a neural network based joint mitigation of the IQ imbalance and power amplifier nonlinearities that cause degradation in the transmit signal quality of the wireless communication systems. A Real Value...
Detection Schemes for High Order M-Ary QAM Under Transmit Nonlinearities
Gulgun, Ziya; Yılmaz, Ali Özgür (Institute of Electrical and Electronics Engineers (IEEE), 2019-07-01)
Nonlinearities in various stages of a transmitter may hinder and restrict the transmission rate. As observed in many studies, outermost constellation points are usually more adversely affected by these impairments. To obse...
Experimental Analysis and FPGA Implementation of the Real Valued Time Delay Neural Network Based Digital Predistortion
Yesil, Soner; Sen, Cansu; Yılmaz, Ali Özgür (2019-01-01)
This paper presents an FPGA implementation of the Real Valued Time Delay Neural Network (RVTDNN) based digital predistortion with a very low resource utilization and high throughput. The implementation exploits efficient u...
Performance of One-Bit Massive MIMO With Oversampling Under Adjacent Channel Interference
Üçüncü, Ali Bulut; Bjornson, Emil; Johansson, Hakan; Yılmaz, Ali Özgür; Larsson, Erik G. (2019-01-01)
Massive multiple-input multiple-output (MIMO) systems have attracted much attention lately due to the many advantages they provide over single-antenna systems. Owing to the many antennas, low-cost implementation and low po...
Oversampling in One-Bit Quantized Massive MIMO Systems and Performance Analysis
Üçüncü, Ali Bulut; Yılmaz, Ali Özgür (2018-12-01)
Low-resolution analog-to-digital converters (ADCs) have attracted much attention lately for massive multiple-input multiple-output (MIMO) communication and systems with large bandwidth. Especially, 1-bit ADCs are suitable ...
High Order QAM Performance Under Phase and Amplitude Distortions
Gulgun, Ziya; Yılmaz, Ali Özgür (2018-07-11)
High Order QAM such as 512QAM, 1024QAM along with mm-wave transmission is one of the strong candidates for next generation wireless networks. However, due to nonlinearities of RF devices the performance of higher order QAM...
An experimental study on Power Amplifier linearisation by artificial neural networks Yapay Sinir Aǧlari ile Güç Yükselteç Doǧrusalląstirma Amaçli Deneysel Bir Çalisma
Yesil, Soner; Kolagasioglu, Ahmet Ertugrul; Yılmaz, Ali Özgür (2018-07-05)
This paper represents an experimental study on the linearisation of Power Amplifiers especially on high output power regions by utilizing an artificial neural network structure and open-loop training method. For the same i...
Usage of device-to-device communication with multiple antennas at the cell edges Çoklu antenli cihazdan cihaza haberleşme yönteminin hücre kenarindaki alanlarda kullanimi
Erkan, Kerem; Yılmaz, Ali Özgür (2018-07-05)
5G technology is considered to bring dramatic improvements from the large scale data transmission to latency, from reliable data trasmission to energy efficiency. One significant improvement is expected in the communicatio...
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