A Survey on Peak Windowing Techniques for PAPR Reduction

Orthogonal Frequency Division Multiplexing (OFDM) is an efficient modulation technique which can be used for both broadband wired and wireless communication. OFDM is now becoming widely popular among the multicarrier communication systems because of its immunity to Inter Symbol Interference (ISI), Inter Carrier Interference (ICI), impulse noise etc. and also it has high spectral efficiency. Studies show that high Peak to Average Power Ratio (PAPR) is one of the major drawbacks in multicarrier communication system. PAPR is defined as the relation between maximum powers of the transmitted signal divided by the average power. Through PAPR reduction the efficiency of high power amplifier could be substantially improved and nonlinear distortion noise caused by the HPA could also be significantly reduced. By PAPR reduction spectral efficiency can be increased and system will be more energy efficient. High PAPR will reduce the BER performance of the system. Various approaches have been proposed to reduce the PAPR such as clipping, coding schemes, phase optimization, nonlinear companding transforms, Tone Reservation (TR) and Tone Injection (TI), constellation shaping, Partial Transmission Sequence (PTS) and Selective Mapping (SLM). Among all the PAPR reduction techniques, peak windowing is an effective one for practical implementation as there is no side information and maintain a good spectral characteristic compared with the clipping method.