Yazar "Gomec, Meltem" seçeneğine göre listele

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    A novel adaptive blind channel equalizer for chaotic communication systems
    (Institute of Electrical and Electronics Engineers Inc., 2019) Gomec, Meltem; Maraş, Meryem; Ayvaz, Elif Nur; Özen, Ali
    In this paper, a new blind channel equalizer based on fuzzy logic is proposed for chaotic communication systems. Inverse filtering criteria (IFC) based algorithm, super exponential algorithm (SEA) and constant modulus algorithm (CMA) are the most popular three-blind channel equalization algorithm for classical communication systems. However, these algorithms are not sufficient for the desired performance values for chaotic communication systems and need to be developed. In this study, the normalized CMA algorithm based on fuzzy logic (Fuzzy Logic Normalized CMA, F-N-CMA) is proposed for chaotic communication systems. Computer simulation studies are performed to test the accuracy of the proposed method and to compare with the classical CMA, modified CMA (Modified CMA, M-CMA) and normalized CMA (Normalized CMA, NCMA) algorithms. It is observed that the best MSE-Iteration Number, MSE-SNR, ISI-Iteration Number and ISI-SNR achievements are obtained with the proposed method from the simulation results. © 2019 IEEE.
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    A Novel Concatenated LWT and WHT Based UFMC Waveform Design for the Next Generation Wireless Communication Systems
    (Wiley, 2021) Ayvaz, Elif Nur; Maraş, Meryem; Gomec, Meltem; Savaşçıhabeş, Asuman; Özen, Ali
    A novel concatenated Lifting Wavelet Transform (LWT) and Walsh Hadamard Transform (WHT) with Universal Filtered Multi Carrier (UFMC) waveform is suggested as an alternative to Orthogonal Frequency Division Multiplexing (OFDM) waveform for the next generation wireless telecommunication systems in this paper. The suggested waveform is composed of LWT and WHT with UFMC waveform. Both the elimination the disadvantages of OFDM and the improvement the achievement of UFMC waveform, from the fifth generation waveform candidates, has been aimed with the suggested waveform. In order to verify the performance of the suggested waveform and compare with the traditional OFDM, UFMC, and LWT-UFMC waveform computer simulation studies are performed in additive white Gaussian noise and flat Rayleigh fading channel environments. The acquired computer simulation results exhibit that the achievement of the suggested waveform has better than the achievement of the traditional OFDM, UFMC, and LWT-UFMC waveform. (c) 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.
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    A novel waveform design based on lifting wavelet transform for the 5G beyond
    (Institute of Electrical and Electronics Engineers Inc., 2019) Ayvaz, Elif Nur; Maraş, Meryem; Gomec, Meltem; Özen, Ali
    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 fading channels. It is seen that the proposed waveform from the obtained simulation results has the best and highly satisfactory performance. © 2019 IEEE.
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    An WHT spread UFMC waveform design for the next generation wireless communications
    (Institute of Electrical and Electronics Engineers Inc., 2019) Nur Ayvaz, Elif; Maraş, Meryem; Gomec, Meltem; Özen, Ali
    In this paper, the Walsh Hadamard Transform (WHT) spread universal filter multi carrier (UFMC) waveform (WHT-UFMC) is recommended for the next generation wireless communication systems. The proposed method aims to increase the performance of the UFMC waveform, which is from the 5th Generation (5G) waveform candidates. Computer simulation studies are performed to test the performance of the proposed waveform and to compare with the classical OFDM and UFMC in AWGN and flat Rayleigh fading channels. It is seen that the proposed waveform has the best performances from the obtained simulation results. © 2019 IEEE.
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    Dual tree complex wavelet transform based multi carrier communication systems
    (Institute of Electrical and Electronics Engineers Inc., 2019) Gomec, Meltem; Maraş, Meryem; Ayvaz, Elif Nur; Özen, Ali
    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 attained simulation outcomes that the DT-CWT-OFDM waveform has better achievement than the classical OFDM and DWT-OFDM waveforms and also provides approximately 6 dB SNR gain against the classical OFDM and approximately 1.5 dB SNR gain against the DWT-OFDM for a BER value of lE-4. © 2019 IEEE.
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    Improving the performance of GFDM waveform employing lifting wavelet transform
    (Institute of Electrical and Electronics Engineers Inc., 2019) Maraş, Meryem; Ayvaz, Elif Nur; Gomec, Meltem; Özen, Ali
    In this paper, it is recommended that the combination of generalized frequency division multiplexing (GFDM) structure with lifting wavelet transform (LWT) to increase the performance of GFDM waveform from waveform candidates of the next generation wireless communication systems. The proposed LWT-GFDM method is suitable for the requirements of the 5th Generation (5G) communication systems such as low latency, low PAPR (Peak to Average Power Ratio) and low OOBE (Out of Band Emission). In order to test the performance of the proposed method and compare it with classical OFDM, GFDM and GFDM using discrete wavelet transform (DWT-GFDM), computer simulation studies are performed in AWGN and flat Rayleigh fading channels. It is observed that the proposed method has the best performances from the obtained simulation results. © 2019 IEEE.