Performance Analysis of Hybrid Companding PAPR Reduction Method in OFDM Systems for 5G Communications

Orthogonal Frequency Division Multiplexing (OFDM) plays a vital role in wireless communication systems like WiMax and WiFi suffers with high PAPR. In OFDM systems, to acquire tolerable transmit power the high-power amplifiers (HPA) are used. This high PAPR deranges the HPA to have substantial back-off to make sure of linear amplification of signal, which degrades the efficiency of HPA. A handful of PAPR reductions have been protruded to mitigate the high PAPR like A-law and μ-law comapanding techniques which lowers the out-of-band interference (OBI), scrambling methods like Selected Mapping (SLM) and Partial Transmit Sequence (PTS) increases the BER performance. To further reduce PAPR and complexity of the system, the hybrid method is used with companding techniques without any signal distortions. The results are encouraging and the BER performance is much better than the reported results in the literature. Hence this technique can be used in OFDM systems and 5G communications.