Alternative Signal Generation in OFDM for PAPR Reduction by Using Shift Value Set for CSS

Abstract

In wireless communication, OFDM is used as LTE in today’s generation. It provides high data rate, high speed and low complexity compared to conventional methods such as CDMA, TDMA and FDMA. Thus OFDM also offers some of the disadvantages such as PAPR, ICI and bit error rate etc,. mainly PAPR is occurred due to insufficient power spectrum. Thousands of techniques have been proposed to lower PAPR such as to improve spectral efficiency. To transmit signal in OFDM will preferred to have minimum PAPR for fixed peak power transmission higher average power is used. PTS provides better efficiency with reduced complexity. In proposed j method this PTS scheme is combined with the cyclic shifted sequences (CSSs) scheme to reduce the complexity by cyclically shifting the OFDM sequences and then combined to generate an alternative signal sequence which directly relates to PAPR reduction. In simulation results, the SV sets are carefully selected and its validation is approved by performing the simulations on the Selected SV sets. In future scope, piecewise linear companding technique is carried to improve the efficiency and data rate. Simulation results provide lesser complexity compared to the existing method.