An Improved Discrete Cosine Transform (DCT) for Peak-to-Average Power Ratio (PAPR) Reduction in OFDM System
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How to Cite

Lim, Y. L., Wahab, A. A. A., Alhady, S. S. N., Othman, W. A. F. W., & Husin, H. (2019). An Improved Discrete Cosine Transform (DCT) for Peak-to-Average Power Ratio (PAPR) Reduction in OFDM System. ROBOTIKA, 1(2), 7-23. Retrieved from http://technical-journals.org/index.php/ROBOTIKA/article/view/36

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) which is the recognized signal modulator parameter has been widely applied at wideband communication and Digital Signal Processing. 4G mobile communications and Wireless networks have been accounted for the nobility of OFDM. This due to some advantages of OFDM for instance, high spectral efficiency, high transmission bit rate and immunity against multipath fading which leads to the heavy application of OFDM in our appliances nowadays. However, the high Peak-to-Average Power Ratio (PAPR) value is still the agenda which is investigated by a lot of researchers who specialize in OFDM. This is because of the high value of PAPR restricts the achievement of signal transmission. This paper discusses the improved method of Principle Component Analysis (PCA) to bring down PAPR values of the OFDM system. The proposed ideas involve Discrete Cosine Transform replaces the Fast Fourier Transform in the OFDM signal modulation technique by utilizing the modulation scheme of Quadrature Phase Shift Keying (QPSK). This proposed method is able to provide better performance in PAPR reduction. The proposed method of PCA with DCT with the 1024 numbers of subcarriers improves the greatest performance by 5.72%

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