• D.Prakash Raj

Orthogonal frequency division multiplexing (OFDM) signals have an issue of the high Peak-to-Average power ratio (PAPR) that is a noteworthy limitation in OFDM communication. High PAPR, which causes distortion when the OFDM signal enters into a nonlinear high power amplifier and reduces the system efficiency. We have different techniques for reducing the PAPR, Partial Transmit Sequence (PTS) is a good technique among them. A cyclic shift sequences (CSS) technique is developed using the PTS method to enhance the performance in decreasing the PAPR. In the CSS scheme, we can reduce PAPR by careful selection of shift value (SV) sets. We can reduce PAPR further by the utilization of a new Companding transform known as piece wise linear companding. In this letter, companding technique is used in addition to CSS scheme to accomplish great outcome in reducing PAPR. If the peak amplitude of the signal to be companded and the scale of the linear transform is carefully designed the proposed system can have an effective reduction in PAPR.

Orthogonal Frequency Division Multiplexing (OFDM), Peak-to-Average Power Ratio (PAPR), Partial Transmit Sequence (PTS), Cyclic Shift Sequences (CSS), Complementary Cumulative distribution Function (CCDF), Piecewise Linear Companding Transform.

"Cyclic Shift Sequences With Piecewise Linear Companding Transform For Reducing PAPR In OFDM Systems", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 8, page no.581-586, August-2018, Available :http://www.jetir.org/papers/JETIR1808387.pdf

"Cyclic Shift Sequences With Piecewise Linear Companding Transform For Reducing PAPR In OFDM Systems", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 8, page no. pp581-586, August-2018, Available at : http://www.jetir.org/papers/JETIR1808387.pdf