An Innovative Piecewise Linear Companding Method for PAPR Reduction and Companding Distortion in OFDM System
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Abstract
Orthogonal frequency division multiplexing (OFDM) is a popular modulation/multiplexing scheme offers high dataratesIt is considered as multicarrier transmission scheme supports future generation wireless as well as wireline communication systems.OFDM frequently suffers from high Peak to Average Power Ratio (PAPR) which eventually increases the Analogue to Digital and Digital to Analogue converters complexity levels and reduces HPA (RF) efficiency. Various Peak to average power ratio (PAPR) reduction schemes have been proposed in the past and companding is the popular PAPR reduction which is inserted after modulation in the OFDM system. Although companding scheme provides better results but simultaneously its presence as extra operation increases the bit error rate. In this paper, a novel piecewise linear companding scheme is implemented to reduce the PAPR impact and control the commanding distortion in the OFDM system. The piecewise linear companding scheme reduces the peak to average power ratio by clipping the amplitudes over the compounded peak amplitude. Finally, the simulation result yields the better spectral efficiency and batters BER performance while mitigating the companding distortion better way the PAPR is reduced in an accurate way.
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