Abstract
One of the problems of OFDM system is the Peak to Average Power Ratio (PAPR) which adversely affects performance efficiency. In this paper, the PAPR of OFDM signal has been reduced by using discrete cosine transform (DCT) precoding with repeated clipping and filtering (RCF) plus A-law companding. The simulations were carried out in MATLAB looking at four different scenarios which are conventional (or uncoded) OFDM system, uncoded OFDM plus RCF, precoded OFDM plus RCF, and precoded with RCF plus A-law. For the uncoded OFDM signal, the PAPR was 10.51dB at CCDF of 0.001. Then RCF algorithm was added and a reduced PAPR of value 6.80dB was obtained which is an improvement of 35.3%. The PAPR was further reduced to 6.68dB after fourth iteration by precoding the OFDM signal before adding the RCF. This is means 36.44 % reduction of PAPR (or improvement of OFDM signal). Inclusion of A-law companding into precoding with RCF scheme in the OFDM system reduced the PAPR much more to a value of 1.71dB. This is 83.73% improvement in OFDM signal performance in terms of PAPR reduction. Generally, the proposed solution was able to reduced the PAPR to a level sufficiently enough to improve the PAPR performance.
Keywords
A-law companding, DCT precoding, OFDM, PAPR, RCF
Citations
IRE Journals:
Chika A. Egbunugha , Chukwuka Chinemelu
"Improving the Performance of OFDM Signal based on Peak to Average Power Ratio Reduction" Iconic Research And Engineering Journals Volume 4 Issue 12 2021 Page 291-297
IEEE:
Chika A. Egbunugha , Chukwuka Chinemelu
"Improving the Performance of OFDM Signal based on Peak to Average Power Ratio Reduction" Iconic Research And Engineering Journals, 4(12)
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