Improving PAPR Reduction for OFDM using Hybrid Techniques

The Peak-to-Average Power Ratio (PAPR) reduction in Orthogonal Frequency Division Multiplexing (OFDM) system has gained widespread attention during the last decade, leading to the development of several techniques for PAPR reduction. To benefit from these techniques while overcoming their inherent shortcomings, more recent work shows the use of hybrid variants of these techniques. In this paper, we present a brief overview of the hybrid techniques adapted for PAPR reduction. We also comment on the computational complexity and practicability of these approaches. Furthermore the paper covers a variety of hybrid techniques combining simple schemes e.g. clipping, companding and more complex schemes such as partial transmit sequence.