The increasing use of wireless data has been created a need for continuous innovations in wireless data technology to provide greater capabilities and higher quality services. OFDM is one of the most important modulation techniques in wireless communication systems and is the fundamental technology in modern communication systems such as 5G cellular networks and WiMAX. In this research, the LTE-SISO- OFDM system has been studied and then has been improved by reducing the Peak to Average Power Ratio (PAPR) of the signal. A hybrid technique has been proposed, combining several techniques including New Error Function Companding (NERF), Absolute Exponential Companding (AEXP), and Discrete Sine Transform (DST). Based on the obtained results, the effectiveness of the proposed technique has been proved through the reduction of PAPR and Bit Error Rate (BER) for different values of Signal to Noise Ratio (SNR), thereby improving the reliability and quality of service of the system. All simulation experiences have been performed using the MATLAB program.