A new step size control technique for blind and non-blind equalization algorithms

Ali Özen

A new variable step size (VSS) control technique employing cross correlation between channel output and error signal has been proposed as a solution to the problem of slow convergence of blind and non-blind equalization algorithms. The new method resolves the conflict between the convergence rate and low steady state error of the fixed step-size conventional blind and non-blind equalization algorithms, such as Constant Modulus Algorithm (CMA) and Least Mean Squares (LMS) algorithm. Computer simulations have been performed to verify the performance of the proposed method in frequency selective ...Daha fazlası

Makale/Derleme 2013 Radioengineering Journal 10 Görüntülenme

Dual tree complex wavelet transform based multi carrier communication systems

Ali Özen

In this paper, DT-CWT-OFDM waveform based on dual tree complex wavelet conversion (DT-CWT) is introduced to enhance the achievement of the classical OFDM waveform. IFFT/FFT blocks used in the classical OFDM waveform are replaced with IDTCWT/DTCWT blocks in the DT-CWT-OFDM waveform. In order to confirm the achievement of the investigated waveform and compare it with the waveforms of classical OFDM and discrete wavelet conversion based OFDM (DWT-OFDM), computer simulation studies are carried out on AWGN, flat Rayleigh damping and frequency-selective Rayleigh damping channels. It is seen from the ...Daha fazlası

Bildiri 2019 IEEE 42th International Conference on Telecommunications and Signal Processing, TSP 2019 , pp. 6 - 654 7 Görüntülenme

A novel waveform design based on lifting wavelet transform for the 5g beyond

Ali Özen

In this paper, a new waveform design based on Lifting Wavelet Transform (LWT) is proposed for next generation wireless communication systems. The proposed waveform design (LWT-UFMC) consists of combination of the LWT and universal filtered multi carrier (UFMC) waveform. It is aimed to improve the performance of the UFMC waveform, which is from the 5th Generation (5G) waveform candidates, with the proposed LWT-UFMC waveform. Computer simulation studies are performed to test the achievement of the recommended waveform and to compare with the classical OFDM and UFMC in AWGN and flat Rayleigh fadi ...Daha fazlası

Bildiri 2019 IEEE 42th International Conference on Telecommunications and Signal Processing, TSP 2019 , pp. 6 - 663 5 Görüntülenme

A novel walsh hadamard based approach for ımproving performance of zero tail OFDM systems

Ali Özen

A novel zero tail OFDM (ZT OFDM) method based on Walsh Hadamard transform (ZT WHT OFDM) has been proposed to improve the performance of ZT OFDM systems, from 5G candidate waveforms in this paper. Computer simulations have been performed to show the performance of the proposed method in stationary and non-stationary frequency selective Rayleigh fading channels. The obtained simulation results using HIPERLAN/2 physical layer specifications have demonstrated that the proposed ZT WHT OFDM method has considerably better performance and Doppler shift tracking than conventional OFDM and ZT OFDM.

Bildiri 2017 IEEE 25th Signal Processing and Communications Applications SIU 2017 , pp. 1 - 4 5 Görüntülenme