PAPR Reduction in OFDM using Channel Coding in GNU Radio

The fundamental block of WiMAX (Worldwide Interoperability for Microwave Access) PHY layer is Orthogonal Frequency Division Multiplexing (OFDM). The main issue raised in OFDM is high Peak to Average Power Ratio (PAPR) due to multicarrier signal. This paper proposes architecture for PAPR reduction to improve network performance of WiMAX in urban areas where typically Non-Line of sight communications take place. The OFDM can be accomplished by using open source software, GNU Radio and a Software Defined Radio (SDR) hardware platform, USRP (Universal Software Radio Peripheral). In this paper, PAPR is calculated and compared for different modulation schemes, which are mainly used in OFDM. The obtained results proved that PAPR has reduced to 77.86 % for 64-QAM (Quadrature Amplitude Modulation) and to 57.30 % for QPSK (Quadrature Phase Shift Keying) using Channel Coding in GNU Radio.