Improving Peak to Average Power Ratio of OFDM Signal Using DCT Precoding with Combined Distortion Techniques

Bonaventure Ekengwu, Nnaemeka Asiegbu, Chidiebere Muoghalu, Ifeoma Ezeanya

Abstract


This paper has presented Peak to Average Power Ratio (PAPR) reduction improvement in Orthorgonal Frequency Division Multiplexing (OFDM) system using discrete cosine transform (DCT) precoding with repeated clipping and filtering plus Mu-law companding techniques.  Recent studies have shown the use of evolution algorithms and combination of two or more algorithms to reduce PAPR in OFDM system.  The algorithms of DCT, RCF and Mu-law were studied and presented in form of mathematical equations.  MATLAB codes were developed for PAPR analysis in OFDM system. The MATLAB codes for DCT, RCF and Mu-law companding were implemented and incorporated into the OFDM system to enhance the PAPR performance. Simulations were conducted considering uncoded (or conventional) OFDM, uncoded of OFDM with RCF, precoded of OFDM with RCF, and precoded OFDM with RCF plus Mu-law. Using the PAPR value of 10.43dB at CCDF of 10-3 for the uncoded OFDM signal as reference value, it was observed that the introduction of RCF into the uncoded OFDM provided a PAPR value of 6.834dB which is 34.48% improvement. Also, for the precoded OFDM with RCF, the PAPR was reduced to 6.799dB with 34.81% improvement. Finally, the proposed scheme using precoded OFDM with RCF and Mu-law provided an efficient reduction in PAPR with a value of 2.048dB and 80.36% improvement. Thus, the implemented scheme has shown to be effective based on MATLAB simulations conducted.


Keywords


DCT, Mu-law, OFDM, PAPR, RCF

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References


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DOI: http://dx.doi.org/10.52155/ijpsat.v23.1.1945

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