Reduction of high Peak-To-Average Power Ratio(PAPR) based OFDM Systems

Abstract

In the last years wireless communications have experienced a fast growth. However, wireless channels have some drawback just like the multi-path fading. Orthogonal Frequency Division Multiplexing (OFDM) has been an attractive solution for multi-path fading channels, An important problem of OFDM systems is the high peak-to-average power ratio (PAPR).

There are several ways to reduce the PAPR of OFDM systems .A simple technique is clipping such as circle clipping, and square clipping, those methods are called conventional clipping methods, clipping has an effect called Out-of-band noise (OOB), which degrade the system performance, this noise can be eliminated by filter.

In this project octagonal clipping has been proposed because it is less complex instead of conventional clipping and also using FFT-IFFT filter instead of traditional FIR filters .iterated octagonal clipping and filtering several times in order to reduce to high peak-to-average power ratio (PAPR).

The proposed method has been tested with MATLAB program, the simulation results show that the proposed technique performs better than the existing ones the improvement achieved compared to the old method is equal to 37.3% after third alteration process