Joint PAPR reduction and carrier frequency offset compensation in SC-FDMA systems using modified gamma correction companding

Single-carrier frequency division multiple access (SC-FDMA) is a multicarrier modulation technique that has attracted wireless communication systems. However, one of the critical drawbacks of the system is the high peak-to-average power ratio (PAPR). PAPR in SC-FDMA causes nonlinear distortion in power amplifiers leading to inter-symbol interference (ISI) and inter-carrier interference (ICI) in the system. In this paper, we propose a modified gamma correction companding (MGCC) to reduce PAPR than existing companding schemes in SC-FDMA systems substantially. It is revealed that the proposed technique can significantly improve PAPR gain and bit error rate (BER) with the proper choice of companding parameter, thus enabling flexibility in designing an optimum system for uplink data transmission. Further, the simulation results prove that MGCC with joint equalisation and carrier frequency offset (CFO) compensation can achieve superior performance and reduce ISI under multipath fading channels.